bluuebunny/crossref_metadata_2025 huggingface dataset:
Wildlife rehabilitation
Authors: Stocker Les
Published: January 2023

Sir, I am pleased that my Wildcare Handbook received a review in Animal Welfare 1992, 1: 301-302. Wildlife care is now being accepted as a discipline all over the world and I am sorry that Ian Robinson of the RSPCA seems to have missed the whole purpose of the book, that of giving help and treatment to wild birds and other animals that for many years appear to have escaped much needed professional assistance.
Statistics of scientific procedures on living animals
Authors: Eames Malcolm
Published: January 2023

Sir, The workings of the Animals (Scientific Procedures) Act 1986 (Reports and comments, Animal Welfare 1993, 2: 90-92) rightly drew attention to the difficulty of using the Home Office Statistics of Scientific Procedures on Living Animals. Such concerns are not new and are shared by protagonists on both sides of the present debate over the use of animal experimentation in the UK. Indeed, commenting on the 1991 publication, Hart has argued that: ‘Doctors wanting to defend Britain's 3.2 million scientific procedures on living animals will want to know much more about what they are defending than this book tells them.’ (British Medical Journal 303: 670).
Childhood Pet Keeping and Humane Attitudes in Young Adulthood
Authors: Paul E S , Serpell J A
Published: January 2023

A questionnaire survey of 385 UK-based university students was used to investigate whether there was an association between pet keeping in childhood and humane attitudes in young adulthood. Subjects gave detailed, retrospective reports of the pets they had kept during their childhoods, and a variety of attitude scales and open-ended questions were used to measure their current attitudes concerning the welfare of both animals and humans. Higher levels of childhood pet keeping were related to more positive attitudes towards pet animals and greater concerns about the welfare of non-pet animals and humans. Ethical food avoidance practices (eg vegetarianism); membership of animal welfare and environmental organizations were also found to be associated with pet keeping during childhood. Knowledge of the experiences that underlie existing variation in humane attitudes will greatly assist the development of more effective humane education programmes in the future.
Measuring Gut Passage Times in Small New World Monkeys
Authors: Price E C
Published: January 2023

A simple technique for investigating gut passage times in small New World primates was developed, which produced good results without any need for special housing or diet, or for the separation of monkeys from their groups. This technique, which allowed the administration of a faecal marker, chromium oxide, to specific individuals, was used to investigate gut passage times in five species of the genera Callithrix, Saguinus, Leontopithecus and Callimico. Overall, average gut passage time was 4.5 hours, and there were no species differences. Such nondisruptive methods could help in assessing the effects of dietary changes in captive monkeys, and therefore be of considerable value in improving captive diets and hence welfare and breeding success.
Captive polar bears
Authors: Warwick Clifford
Published: January 2023

Sir, Might I comment on Alison Ames’ review of Ormrod's Captive Polar Bear Report (Animal Welfare 1993, 2: 290292).
Author's response
Authors: Ames Alison
Published: January 2023

Sir, I am responding to Clifford Warwick's comments on my review of Ormrod's Captive Polar Bear Report. It is hard to accept that Ormrod's report, which seems largely negative in its conclusions, can be described as ‘well intentioned’. He made no suggestions for changes or improvements to the welfare of polar bears at present in zoos. It is easy to condemn zoos for keeping these animals, some of which have been inherited by current management, but it does nothing to improve their lives. I certainly agree with Ormrod that captive polar bears present a problem, but we differ in our solutions.
Comparison of the Behaviour of Broiler Chickens in Indoor and Free-Range Environments
Authors: Weeks C A , Nicol C J , Sherwin C M , Kestin S C
Published: January 2023

The behaviour of broilers reared at pasture from 4 to 12 weeks of age on a low density diet supplied either indoors or outdoors, was compared with that of birds reared inside on deep litter. This single study found few differences in behaviour. Activity levels of birds outside were initially greater, but from six weeks of age lying increased to comparable levels in all groups.

Surprisingly little use was made of the extra space and facilities such as perches at pasture. It is proposed that the main reason for this was leg weakness as 80 per cent of the birds had a detectable gait abnormality at seven weeks of age. There was no evidence of reduced motivation to extend the behavioural repertoire, as, for example, ground pecking remained at significantly higher levels in the outdoor groups because it could also be performed from a lying posture.
Portable Handling Facilities to Improve the Welfare of Farmed Red Deer (Cervus Elaphus)
Authors: Hamilton W J
Published: January 2023

The welfare of farmed animals can be greatly influenced by the availability of appropriately designed and tested handling systems. Farmers who start a new enterprise, such as deer farming, with a small herd may be reluctant to invest in a permanently located handling facility, and this may have an adverse effect on the welfare of the deer. The design, construction and use of a portable handling facility for farmed deer is described. The advantages to management and the benefits to the welfare of deer of being able to transport the handling system to where the deer are grazing are illustrated. The system enhances the ability to monitor the incidence of disease and injury in a deer herd and provides for proper therapeutic or prophylactic treatments to be given as required.
Environmentally Enriched Housing for Cats When Housed Singly
Authors: Loveridge G G , Horrocks L J , Hawthorne A J
Published: January 2023

It is generally accepted that to carry out certain trials or procedures, particularly metabolism or digestibility studies, it is necessary to house animals singly, often in sterile metal cages which differ greatly from the animal's normal living accommodation. The lack of choice, mental and physical stimulation and general ‘creature comforts’ increases the stress of isolation.

The design of the buildings at the Waltham Centre for Pet Nutrition aim to ameliorate these unsatisfactory conditions and provide environmental enrichment, freedom of choice and mental and physical stimulation, in housing as similar as possible to the normal housing of domestic pets.
Editorial
Authors: Ewbank Roger
Published: January 2023

The first contribution in this issue of Animal Welfare is the second of the newly instigated Invited Essays, written at the invitation of the editor and aimed at addressing contemporary welfare problems. It is by Robert Hubrecht, Assistant Director of UFAW and it examines the techniques involved in the genetic modification of animals, and considers the welfare implications and the relevance of the current UK legislation. These essays, which will be an occasional feature of the journal, are refereed by independent experts but very much represent the personal views of the authors. Hopefully some of the opinions expressed will stimulate readers to respond with constructive critical comments, which could be published in the journal's Letters section. The original author will of course have the right to reply.
Welfare Implications of the Gas Stunning of Pigs 1. Determination of Aversion to the Initial Inhalation of Carbon Dioxide or Argon
Authors: Raj ABM , Gregory N G
Published: January 2023

The aversive effects of 90 per cent argon in air, 30 per cent carbon dioxide in air or 90 per cent carbon dioxide in air were investigated in slaughter weight pigs. Aversion was assessed from their reluctance to enter the three gaseous atmospheres to obtain a reward (apples). The pigs did not show any aversion to the inhalation of 90 per cent argon in air. The majority of the pigs did not show aversion to the presence of 30 per cent carbon dioxide in air. By contrast, the inhalation of 90 per cent carbon dioxide was aversive to the majority of the pigs. Fasting them for up to 24h prior to testing did not overcome the pigs ‘ reluctance to enter an atmosphere containing 90 per cent carbon dioxide.
The Condition and Survival After Release of Captive-Reared Fox Cubs
Authors: Robertson C P J , Harris S
Published: January 2023

In Britain large numbers of animals are taken into captivity for treatment or care and then subsequently returned to the wild, but there are few data on the effectiveness of these rehabilitation programmes. In this study, over a period of four years 251 fox cubs that had been captive-reared were tagged and released; 90 were recovered. Survival rates were low, and road traffic accidents were found to be a major cause of mortality immediately following release. Recovery distances were lower than expected. The stress associated with captive-rearing meant that released foxes weighed less than wild-reared foxes, and they suffered further weight loss in the period immediately following release, even though an analysis of the stomach contents of animals recovered dead showed that released foxes rapidly learnt to hunt successfully.

It was concluded that captive-rearing is a problematic process for foxes, and contrary to predictions they face severe problems in adapting following release. Suggestions are made for the improvement of fox captive-rearing and release programmes, and the need for similar studies on other species is highlighted.
New Zealand slaughter standards
Authors: Blackmore David K
Published: January 2023

Sir, I would like to comment on the short unsigned review of the Codes of Recommendations and Minimum Standards for the Welfare of Animals at the Time of Slaughter at Licensed and Approved Premises published in Animal Welfare 4(3): August 1995.
Assessment of Motivation in the Lizard, Chalcides Ocellatus
Authors: Skelton T M , Waran N K , Young R J
Published: January 2023

The purpose of this study was to assess whether running an alleyway can be used to measure the motivation of lizards. Six, eyed skinks, Chalcides ocellatus, were trained to run an alleyway to reach sand in which to hide. Each skink was deprived of sand for 0, 1, 5 or 15 minutes on four occasions and the times to run the alleyway and the latencies to move were recorded. When the sand was 38cm from the start, the three deprivation periods resulted in decreased latencies and increased speed (P < 0.01), but there was no difference between the speeds or latencies for any of the deprivation periods. In a second experiment, the sand was moved to 94cm from the start. Latencies to move did decrease (p < 0.05) as in the first experiment, but speed did not increase. Within certain constraints, this methodology appears to be a good way of assessing motivation of reptiles.
Furs, Traps and Europe - Are the Foxes in Charge of the Geese?
Authors: Bowles David
Published: January 2023

If we agree that improvements in animal welfare should be determined primarily through legislation, we would probably also agree that it is important not to disregard an issue merely because laws have been changed and solutions appear to have been found. As in all contracts, it is vital to read the small print and to follow an issue right through to the end. The saga of improving global trapping methods provides a salutary lesson for both.
Preferences of Laboratory Mice for Characteristics of Soiling Sites
Authors: Sherwin C M
Published: January 2023

When designing cages to maximize welfare, we should consider both the physical and psychological needs of the animals for which the cage is intended. Many laboratory species show non-random defecation patterns and therefore might possess a psychological need for soiling sites with preferred characteristics. This study examined whether caged laboratory mice preferred to defecate on a floor with or without sawdust, and whether mice preferentially defecated in clearly partitioned areas of the cage which prevented mixing of soiled and clean sawdust. The mice were recorded as active in each area of the cage at a frequency that would be expected from the floor-area available, ie general activity was randomly distributed, but, the mice were selective in the areas used for defecation. Significantly more faeces were deposited in areas containing sawdust than in areas without (p<0.0001). After corrections for differences in the size of floor-area, significantly fewer faeces were deposited in partitioned areas at the rear of the cage than in the front area of the cage which contained the feeder and drinkers (p <0.001). Overall, these results show that the mice defecated in localized areas and preferred to defecate in areas containing sawdust. These results support other evidence which indicates that conventional cage designs for mice do not provide a sufficiently complex or appropriate environment to allow selective soiling behaviour. Such cages might therefore be inadequate with respect to catering for the psychological needs and overall welfare of laboratory mice.
An Assessment of Stress Caused in Sheep by Watching Slaughter of Other Sheep
Authors: Anil M H , Preston J , McKinstry J L , Rodway R G , Brown S N
Published: January 2023

The question of whether witnessing slaughter of conspecifics is distressing was investigated in sheep. Previously catheterized sheep were allowed to see the stunning and sticking (exsanguination) of other sheep. Heart rate was monitored and serial blood samples were taken to assess stress responses. Although the measurable parameter levels were generally high due to human contact and handling, there were no specific increases in response to witnessing stunning and slaughter. This work failed to produce any evidence to suggest that sheep are distressed by witnessing the slaughter act.
Postgraduate Teaching in Farm Animal Welfare and Ethics
Authors: Lund V
Published: January 2023

A survey was performed in the Spring of 1995 to map postgraduate education world-wide in animal welfare and ethics. Twenty-one universities in ten countries on three continents were identified, that either offered, or had definite plans to start, postgraduate courses relating to animal welfare and/or ethics. Of these universities nine were European, one Australian, one New Zealand, one Canadian and nine were American. In Australia, Canada and the United States courses are given during a semester or quarter of a semester, while in Europe short but concentrated courses or seminars are more common, with several of them aimed at practising veterinarians rather than at postgraduate students. Interest in the subject of animal welfare and ethics seems to be increasing. Many of the existing courses were started during recent years, and two of the most comprehensive programmes offered were started in 1995. Also, four chairs in animal welfare were recently established or were advertised in Europe at the time of this survey. One chair had been established in 1994, in New Zealand, one was to be advertised in the United States and one in Canada. Another trend is towards the establishment of ‘centres’ for the study of animal welfare issues. Associated with these new chairs and centres, educational programmes will probably be started. Few of the present courses focus mainly on farm animal issues, instead they cover a large spectrum of the human-animal relationship. Ethics is a minor part of the courses as compared to the science and animal welfare components.
The Humane Control of Captive Marmoset and Tamarin Populations
Authors: Sainsbury A W
Published: January 2023

In zoo and laboratory colonies of marmosets and tamarins (Callitrichidae) there has been an increasing need to adopt breeding control methods. In zoos, this need has been driven by a growth in populations. In laboratories, increased interest in control options has followed from the requirement to improve welfare by housing potential breeding animals together. Progestagen-containing contraceptive implants or depot-injections, prostaglandin injection regimes, vasectomy and various group-management methods have been used to control reproduction in marmoset and tamarin colonies. There is a need for advances in control techniques suitable for use in zoos. In the meantime, a policy of selective euthanasia or the use of vasectomy are recommended as control methods. In laboratories, although improved control methods are required, a number of techniques have been found to be satisfactory. When there are surplus marmosets and tamarins, the alternatives for their utilization include movement to other colonies, use for studies within zoos or in laboratories, sale to private keepers or euthanasia. Selling these animals privately is not recommended, except in exceptional circumstances. The preferred control option will differ in each circumstance and guidance is given in this paper.
The Early Ontogeny of Bar-Gnawing in Laboratory Gerbils
Authors: Wiedenmayer C
Published: January 2023

The early development of bar-gnawing was studied in young gerbils kept in standard laboratory cages. Bar-gnawing was performed on the bars of the cage lid and developed shortly after eye-opening at an age of 18 days. It increased in bout length and duration with age and there was considerable variability in behaviour between individuals. It is discussed as to whether bar-gnawing is a stereotypy and in which behavioural context it develops.
Housing and Welfare in Laboratory Rats: Welfare Implications of Isolation and Social Contact Among Caged Males
Authors: Hurst J L , Barnard C J , Nevison C M , West C D
Published: January 2023

Male laboratory rats (Rattus norvegicus; Wistar, Alderley Park) were housed as singletons or groups of three in units of two joined, but divided cages. Units were divided by different types of barrier that allowed different degrees of social contact across the barrier. Singletons were established either with another singleton as a neighbour on the other side of the barrier, or with a group of three as neighbours. Relative to group-housed animals, singly-housed rats showed reduced activity and a greater incidence of self-directed behaviours and behaviours apparently related to escape or seeking social information. Pathophysiological evidence was consistent with Baenninger's (1967) suggestion that tail manipulation in singletons is a surrogate social response, but was also consistent with an overall increase in self-directed activity, reflecting elasticity in time budgeting. Variation in the degree of increase in self-directed activity among singletons and the negative correlation between self-directed activity and organ pathology may have reflected differences in the ability of individuals to avoid an activity limbo. While reduced corticosterone concentration and organ pathology compared with grouped rats implied that separation may remove social stress, responses to contact with neighbours, and correlations between behaviours and organ pathology suggested that rats may actively seek social interaction. Broad differences in stress responses between single and grouped housing conditions may therefore be an inadequate yardstick to the animals’ welfare. However, exposure to neighbours reduced the aggressiveness of singly-housed males when they were eventually introduced into an unfamiliar group, suggesting that a degree of exposure to neighbours (separation, but not isolation) may have some welfare benefits for laboratory-housed rats, depending on procedures.
Behaviour of a Captive Pair of Clouded Leopards (Neofelis Nebulosa): Introduction Without Injury
Authors: Law G , Tatner P
Published: January 2023

The behaviour of a captive pair of clouded leopards was studied during a series of manipulations in order to devise a safe method of introduction for mating purposes. Manipulations consisted of allowing each individual unrestricted access to the other's outdoor enclosure, initially in the absence of the other individual, but culminating in joint access. Dominant activities involved sitting, lying, grooming, and adopting a low profile amongst the vegetation. The female tended to be more arboreal than the male, although both cats spent most of their time on the ground. The male marked various sites by foot-scrubbing (1-4% occurrence), which involved shuffling urine into the ground using his hind feet. This was less common in the female (<1%). Male foot-scrubbing was most frequent on introduction nights, and in the female's enclosure. Both sexes exhibited cheek-marking behaviour, although it was more common in the male. The frequency of male cheek-marking increased in response to urine production by the female. Observations during introductions suggested that the male may assess the female's reproductive condition by stimulating her to urinate. The most marked changes in the behaviour occurred between control and introduction nights. The larger male took the initiative, and the female appeared extremely wary of his presence, striking out with her claws if he approached too closely. Although the individuals did not mate during the introductions, the method of gradual acquaintance through an experimentally induced overlap of ‘home ranges’ was effective, as the female was not injured even though the male had a history of aggression.
Heart Rate and Stress Hormone Responses of Sheep to Road Transport Following Two Different Loading Procedures
Authors: Parrot R F , Hall S J G , Lloyd D M
Published: January 2023

This study was designed to investigate the physiological responses induced in sheep (n = 18) by two different loading techniques followed by a short road journey. All animals were prepared with venous catheters, to minimize the disturbing effects of blood sampling, and nine sheep were fitted with heart rate monitors. The animals were loaded onto a transport vehicle in groups of three, alternately using a conventional tailgate ramp or a crate raised with a hydraulic lift. When all of the sheep were loaded, they were taken on a journey lasting 195min. Blood samples were collected in the home pen, directly after loading, and at 15min intervals during the journey. Measurements were made of plasma concentrations of Cortisol, prolactin and catecholamines (adrenaline and noradrenaline). The results indicated that heart rate increased during loading, regardless of the method used. No changes in concentrations of Cortisol or the catecholamines were detected, although a small increase in prolactin was noted when animals were loaded using the ramp. During transport, all sheep exhibited increases in plasma Cortisol concentrations which were greatest during the first 2h of the journey. The results suggest that, under the conditions employed in this experiment, the effects of the two loading procedures were similar and that transport appeared to be more stressful than loading.
Influence of Dry Feed Supplements on Different Parameters of Welfare in Veal Calves
Authors: Morisse J P , Cotte J P , Huonnic D , Martrenchar A
Published: January 2023

The aim of the study was to compare different behavioural, physiological and performance traits in three groups of veal calves fed either a routine all-liquid diet with milk replacer (GO) or the same diet supplemented with a total of 10kg (G10) or 25kg (G25) of pelleted straw and cereals. Each of the three feeding programmes involved 21 male Friesian calves kept in individual crates for 20 weeks (from 1 to 21 weeks of age). Oral activities, haematological variables, ruminai characteristics, health and performance were all investigated. In calves supplied with dry feed, there was no evidence of ruminating behaviour; and chewing, regarded as a non-nutritive oral activity, was clearly reduced. The incidence of tongue playing and manipulating objects was not influenced by additional pellets.

Haemoglobin concentrations were higher in G25 than in other groups as a result of the extra iron supplied in the pellets. Other blood variables were unchanged. In G10 and G25 changes in rumen characteristics were clearly demonstrated by the following observations: i) the weight of reticulo-rumens increased by 11 and 35 per cent, respectively; ii) small papillae (virtually non-existent in calves fed an all-liquid diet) were present, and there was a darkening of the mucosa; and iii) there was a marked reduction in the number of hairballs, resulting from a continuous elimination of ingested hair by ruminai motility. In G25, carcase weight was significantly (P < 0.05) increased by 6.5 per cent compared with controls and no detrimental effects such as bloating or abomasal ulceration were observed when dry feed was added. Supplying calves with straw-cereal pellets was considered positive for the physiological aspects of welfare in veal calves. However, other diet compositions capable of inducing rumination behaviour should also be investigated.
Behavioural Effects of Social Mixing at Different Stocking Densities in Prepubertal Lambs
Authors: Ruiz-de-la-Torre J L , Manteca X
Published: January 2023

The behavioural effects of mixing individuals from two different flocks were studied in prepubertal lambs of about 20kg body weight kept at either low (1 animal m−2) or high (3.3 animals m−2) stocking densities. At both densities, flock mates associated preferentially with one another over the three experimental days. The social mixing conditions decreased the total number of aggressive interactions (including head-to-head clashes, head-to-body buttings and mountings). Since animals associated preferentially with flock mates, aggressive behaviours were also preferentially directed towards individuals from the same flock. Males initiated significantly more aggressive interactions than females. The total number of aggressive interactions received was similar for males and females, but females received more mountings than males. Stocking density, therefore, had no effect on aggressive behaviour. These results are discussed as they relate to transport and it is suggested that social mixing may not be a welfare problem in prepubertal lambs.
Can ‘Environmental Enrichment’ Affect Domestic Chickens’ Preferences for One Half of an Otherwise Symmetrical Home Cage?
Authors: Jones R B , Carmichael N L
Published: January 2023

Chickens were reared in pairs in wooden boxes from 1 to 10 days of age. One chick from each pair was marked to facilitate identification and its position in one or other of the symmetrical halves of the home box was noted at each of 32 visual scans carried out every day. Cumulative sightings in each half were calculated across the first 5 days to establish the least preferred half. Three ‘enrichment’ objects were then placed in the least preferred half of each box on day 6. The chicks ‘positions were again recorded at each of 32 scans on 5 consecutive days. The enrichment objects were avoided on day 6 but such neophobia waned within 24h and a weak, non-significant trend for enrichment to increase usage of the least preferred half became apparent. The strong side preferences shown by the chicks before the introduction of enrichment stimuli, and their transitory neophobia, sound important cautionary notes for the design and assessment of husbandry and environmental enrichment procedures.
Score Sheets for the Monitoring of Transgenic Mice
Authors: Mertens C , Rülicke T
Published: January 2023

The widespread use of transgenic animals in research, and especially for generating models of human disease, has given rise to calls for a careful documentation of transgenic strains with particular emphasis on characterizing phenotypes and their animal welfare aspects. Based upon several published suggestions for general health monitoring of laboratory animals and upon a questionnaire we developed for the characterization of transgenic strains, score sheets for litter-wise and individual data collection were tested in a pilot study. The documentation concept and some of the most important parameters are presented and discussed with respect to their feasibility and usefulness. The use of score sheets can help in determining the application of humane end points at the individual level, phenotype characterization and assessment of animal welfare for the whole strain, and the development of better breeding strategies - apart from being of direct scientific interest. We suggest that these score sheets, available via the Internet at: www.bzl.unizh.ch/de/database/formtransg/index2.html, should be applied for routine and comprehensive phenotype characterizations of transgenic mouse strains used and kept for animal experimentation.
Editorial
Authors: Kirkwood James K
Published: January 2023

With this edition, Animal Welfare enters its ninth year. The journal's circulation continues to increase. Currently, it is taken up in 36 countries and subscribers include 147 university and college departments and libraries. The growth is a reflection of the increasing interest in, and appreciation of the importance of, the scientific approach to animal welfare around the world. There are many important problems but a thorough understanding of animals’ needs, and how these can be met in practice, is required if progress is to be made.
Fear-Related Behaviour in Two Mouse Strains Differing in Litter Size
Authors: Janczak A M , Braastad B O , Bakken M
Published: January 2023

The present experiment compared the fear-related behaviour of a mouse strain selected over 101 generations for high litter size with that of a randomly selected strain. The H-strain, selected for large litter size, has a mean (± SD) litter size at birth of 21.5 ± 3.5 pups. The randomly bred C-strain has a mean (± SD) litter size of 9.6 ± 2.2 pups. The elevated plus-maze, the light:dark test and a resident:intruder test were used to measure how the mice responded to novelty. In the elevated plus-maze, a well-validated model of animal anxiety, the H-strain was significantly more anxious (having a lower percentage of entries into open arms) than the C-strain at 9 weeks of age. In the light: dark test, in which the light levels were similar to those in the home environment, the H-strain did not differ significantly from the C-strain in its avoidance of the brightest area. In the resident: intruder test, where aggression-trained, older H-strain males were the residents, 11-week-old intruding mice of the C-strain spent a higher percentage of their time in flight and immobility than intruders of the H-strain. There were clear anxiety- and fear-related differences between the strains, which may be related to their selection history. The results illustrate a need for further studies on the consequences of selection for increased production for the ability of animals to adapt to their home environment and cope with environmental changes.
The Effect of Mats on the Welfare of Sows and Piglets in the Farrowing House
Authors: Boyle L A , Regan D , Leonard F C , Lynch P B , Brophy P
Published: January 2023

The objective of this study was to assess the effect of providing mats in the farrowing pen on behaviour and lesions in sows (n = 38) and piglets. Nineteen of the sows and their litters housed in farrowing crates with metal slatted floors were provided with mats, the remaining 19 acting as controls. Sow skin was inspected pre-farrowing and at weaning: the skin and feet of piglets were examined when they were 6 days old. Skin lesions were scored (on a scale of 0 to 6) according to severity. Total lesion scores per sow and median total lesion scores per litter were calculated. Sow behaviour was recorded by direct observation at feeding. Usage of a heat pad for lying in the presence or absence of mats was assessed over a 2hr observation period. Median skin lesion scores of sows did not differ between treatments. Litters from the control treatment had lower skin lesion scores (median [range] 8 [2-12] vs 10 [5-21]; P < 0.05). Median lesion scores of the front legs tended to be higher for piglets on mats (median [range] 8 [1.5-13] vs 4 [1.5-8]; ns). Sows on metal flooring went from kneeling to lowering their hindquarters faster (median [range] 15 [2—45] s) than sows on mats (23 [11—54] s) (P < 0.05). Furthermore, they slipped more on their front (median [range] 2.7 [0-8.7] vs 0 [0-1.3] slips min1; P < 0.001) and hind (median [range] 5.3 [0.3-31.7] vs 1.9 [0-33.3] slips min1; P < 0.05) feet while standing, than sows on mats. More piglets lay on the heat pad when it was covered by a mat (mean ± SEM 45.97 ± 4.49 %) than when no mat was provided (29.29 ± 4.47 %)(P < 0.05). Mats improve sow comfort and reduce slipping. They encourage piglets to lie on the heat pad but cause damage to the skin of the front legs. Providing pigs with mats in the farrowing house could greatly improve welfare on slatted floors, but further research is needed to identify materials that are less abrasive.
Consistency of Measurement of Social Status in Dry-Sows Group-Housed in Indoor and Outdoor Systems
Authors: Bradshaw R H , Skyrme J , Brenninkmeijer E E , Broom D M
Published: January 2023

Each of two 20-sow groups consisted of gilts ie virgin sows (one third) and sows (parity 2-5, ie sows which had given birth 2-5 times). One group was housed indoors with a straw-covered lying area and dunging area. Another group was housed outdoors with a covered straw lying area and two rooting fields. Behavioural observations were made on both groups: indoor sows were observed for 4h day−1, for 10 days (40h); outdoor sows were observed for 6h day−1, for 21 days (126h). Social interactions were classified as threat, bite, knock and push. Continuous data on the type of interaction and the winner or loser were recorded. Four measures of social status, based on social behaviour, were calculated: i) displacement index; ii) level of interaction; iii) success in interactions; and iv) matrix dominance. Spearman rank correlation coefficients between different ranked measures of social status within each group (outdoor or indoor) were significant for displacement index, success in interaction and matrix dominance. The level of interaction did not correlate with other measures (except for matrix dominance in the indoor group). Measures of displacement, success in interaction and matrix dominance provide highly consistent and correlated measures of social status.
Wolves’ avoidance of flag barriers and management implications
Authors: Musiani M , Visalberghi E
Published: January 2023

Sir, Leg-hold traps are the devices most commonly used by researchers to capture wolves. These traps can cause injury, as they cannot usually be monitored closely enough to prevent captured animals from struggling in them. In areas where guard dogs are not used, typical methods for controlling wolf predation on livestock are culling and building substantial or electric fences to exclude wolves. These methods have two major drawbacks - culling can threaten the population, and conventional fences are expensive and difficult to maintain.
Welfare implications of culling red deer (Cervus elaphus)
Authors: Raby Nigel Muers
Published: January 2023

Sir, In your February issue, a paper by E L Bradshaw and P Bateson claims that on 29 August 1995 a deer was attacked by hounds belonging to the Quantock Staghounds. It was not. The video footage shown on television, and upon which this claim is based, was stopped at the point the hounds were apparently on top of the deer. The tape went on to show hounds over running the deer without attacking it. I would be grateful if you would set the record straight on this.
The Welfare of Farmed Mink (Mustela Vison) in Relation to Behavioural Selection: A Review
Authors: Malmkvist J , Hansen S W
Published: January 2023

Animal welfare is a major issue in Europe, and the production of mink,Mustela vison, has also been under debate. One common method of solving animal welfare problems is to adapt the environment to fit the behavioural needs of the animals. In comparison with other forms of husbandry, the mink production environment has remained relatively unchanged over the years and provides for some of the most obvious needs of mink. Whether today's typical housing conditions adequately meet the welfare requirements of mink is currently a topic of discussion. An alternative approach to improving welfare is to modify the animals so that they are better adapted to farming conditions. In large-scale animal production, handling of the individual can be a sporadic event, making an animal's inherent characteristics for temperament and adaptability important factors to consider with respect to its resultant welfare.

In this review we present and discuss experiments on behavioural selection for temperament, and against undesirable behaviours, such as fur chewing, in mink. Fur chewing behaviour can be reduced by selection, apparently without any negative effects, whereas only a little is known about the nature and consequences of selecting against stereotypic behaviours. Long-term selection experiments have shown that it is possible to reduce fearfulness in farmed mink. Using a relatively simple test, it is possible for farmers to add behavioural measurements to their normal selection criteria and thereby improve the welfare of farmed mink.
There are no Known Differences in Brain Mechanisms of Consciousness Between Humans and Other Mammals
Authors: Baars B J
Published: January 2023

Recent scientific findings indicate that consciousness is a fundamental biological adaptation. The known brain correlates of consciousness appear to be phylogenetically ancient, going back at least to early mammals. In all mammals, alertness and sensory consciousness are required for the goal-directed behaviours that make species survival and reproduction possible. In all mammals, the anatomy, neurochemistry and electrical activity of the brain in alert states show striking similarities.

After more than seven decades of cumulative discoveries about waking and sensory consciousness, we have not yet found any fundamental differences between humans and other mammals. Species differences such as the size of neocortex seem to be irrelevant to the existence of alertness and sensory consciousness, though different mammals obviously specialize in different kinds of sensory, cognitive and motor abilities.

Sceptics sometimes claim that objective evidence for consciousness tells us little about subjective experience, such as the experience of conscious pain. Scientifically, however, plausible inferences are routinely based on reliable and consistent patterns of evidence. In other humans, we invariably infer subjective experiences from objective behavioural and brain evidence - if someone yells ‘Ouch!’ after striking a finger with a hammer, we infer that they feel pain. The brain and behavioural evidence for subjective consciousness is essentially identical in humans and other mammals. On the weight of the objective evidence, therefore, subjective experience would seem to be equally plausible in all species with human-like brains and behaviour. Either we deny this experience to other humans (which is rarely done) or, to be consistent, we must also attribute it to other species that meet the same objective standards. It seems that the burden of proof for the absence of subjectivity in mammals should be placed on the sceptics.
Can Invertebrates Suffer? or, How Robust is Argument-By-Analogy?
Authors: Sherwin C M
Published: January 2023

It is a popular notion that, compared to vertebrates, invertebrates have a reduced capacity to experience suffering. This is usually based on arguments that invertebrates show only simple forms of learning, have little memory capacity, do not show behavioural responses to stimuli that would cause ‘higher’ vertebrates to exhibit responses indicative of pain, and have differences in their physiology that would preclude the capacity for suffering. But, how convincing is this ‘evidence’ of a reduced capacity to suffer? Suffering is a negative mental state - a private experience - and, as such, it cannot be measured directly. When assessing the capacity of an animal to experience suffering, we often compare the similarity of its responses with those of ‘higher’ animals, conceptualized in the principle of argument-by-analogy. By closely examining the responses of invertebrates, it can be seen that they often behave in a strikingly analogous manner to vertebrates. In this paper, I discuss published studies that show that invertebrates such as cockroaches, flies and slugs have short- and long-term memory; have age effects on memory; have complex spatial, associative and social learning; perform appropriately in preference tests and consumer demand studies; exhibit behavioural and physiological responses indicative of pain; and, apparently, experience learned helplessness. The similarity of these responses to those of vertebrates may indicate a level of consciousness or suffering that is not normally attributed to invertebrates. This indicates that we should either be more cautious when using argument-by-analogy, or remain open-minded to the possibility that invertebrates are capable of suffering in a similar way to vertebrates.
Contrasts and Comparisons of Incentive Situations in Domestic Poultry
Authors: Haskell M J , Vilarino M , Coerse N C A , Picard M
Published: January 2023

Understanding the way in which animals perceive important features of their environment, and how this information may be stored and used, underpins the study of the impact of husbandry systems on animal welfare. Research into incentive contrast in laboratory animals has indicated that they can store and use information about stimuli associated with situations or resources. If cognitive processes are used, the relevant stimuli associated with a resource or event are encoded, allowing comparisons to be made when the key stimuli are changed. The presence and quality of this comparison, negative or positive, can be ascertained by assessing the change in the animal's level of appetitive or operant responding in order to gain access to the situation on the subsequent trial. We wished to determine whether the presence of a sudden change in appetitive response, such as speed of approach to an area following a change in incentive features of a resource or event in that area, is shown by the domestic chicken. This would indicate the presence of a cognitive comparison of incentives. The magnitude of such a change may also provide a measure of the welfare impact of the change. In the first experiment, 16 groups of four broiler chicks were trained to run a maze to an area where they received a high quality test diet. After training, the test diet of eight groups was changed to a low quality diet that all groups had been receiving in their home pens. Compared to the control unchanged groups, the experimental birds took increasingly longer to run the maze on successive post-change trials; the decrease reaching significance on the fourth post-change trial (P < 0.05). The behaviour of the chicks on the day of the change was indicative of frustration, with greater activity and redirected foraging shown (P < 0.05). Although there was no definitive evidence of cognitive processing which would have been shown by an immediate decrease in approach speed, this may have been due in part to the testing of groups of chicks. However, the occurrence of a frustration reaction indicated that some cognitive representation of food quality may have been present. In a second experiment, individual adult hens were trained to run a runway for access to food or water, while food- or water-deprived, respectively. Every fourth trial in a total of 16 trials, access to the resource was thwarted by a clear plastic lid on the dish. Time taken to traverse the runway was significantly longer on the two trials following this experience (P < 0.05), with no effect of repetition of thwarting (P > 0.05), indicating that the experience of thwarting was aversive. These results indicated that chickens appear to be able to store and use information on incentives. Additionally, with appropriate experimental design, an incentive contrast paradigm might be used to assess birds’ perception of the quality of changes in incentives.
The Hierarchical Organization of the Brain as a Key to the Study of Consciousness in Human and Non-Human Animals: Phylogenetic Implications
Authors: Van den Bos R
Published: January 2023

Recently I discussed a framework to study consciousness in animals (Van den Bos 2000).

This framework comprised:

i) a hierarchical negative feedback model of the central nervous system in which behaviour is the control of input (perception) expressed as transitions of behavioural patterns (= motion) and as transitions of mental states (= consciousness; Van den Bos 1997). Consciousness is hypothesized to be a property of neuronal networks of self-organizing systems dedicated to dealing with rapidly-changing environments affording flexibility of behavioural patterning;

ii) mental states - mental representations - as intentional states as described in folk psychology (feelings, desires; beliefs, insights, etc);

iii) the separation of mental states into two components, an invariant part (‘the presence as such’; that) and a variant part (‘the way it looks’; how), which are separately related to the organization of the central nervous system, ie a ‘neuronal network’ and ‘momentary active connections within the neuronal network determined by input and output of this neuronal network’ respectively;

iv) the idea that every mental state (psychological trait) - whether feelings, desires or beliefs - can be viewed conceptually as the product of a specialized neuronal network and information encoded in the network (neuronal input-output relations) which is expressed as a specific series of spontaneous behavioural patterns or in specific tests; and

v) a phylogeny based on the invariant part, ie mental states, and the presence of a neuronal network.
Possibilities and Limitations of the Study of the Animal Mind
Authors: Van Rooijen J
Published: January 2023

It is my conviction that all animals, including invertebrates, possess a mind. This conviction is not based on scientific evidence. We are unable to observe the mind directly. According to the principle of parsimony, I assume that body and mind are two aspects of the same. This assumption predicts that it will always be possible to find a bodily explanation, implying that it will never be possible to perform an experiment that proves that a mind is present in any animal species, including human beings. As a result, it will never be possible to prove scientifically that my conviction that all animals possess a mind is correct or wrong.
Feeding Gum Arabic to New World Monkeys: Species Differences and Palatability
Authors: Herron S , Price E , Wormell D
Published: January 2023

Members of the New World primate generaCallithrixandCebuellahave specialisations for eating plant exudates. Exudates are also an important component of the diets of many other callitrichid species in the wild, especially at times of nutritional stress. Gum arabic is fed daily to all marmosets and to some tamarins in Jersey Zoo's collection. This study investigated species differences in liking for gum and the effects of the concentration of gum solutions on palatability. As predicted from field data,Callithrixspecies consumed more gum than other species;Saguinusalso showed quite a strong liking for gum. In parallel with data from the wild, lion tamarins(Leontopithecusspp.) consumed the least, andCallimicoalso took relatively little. The two marmoset species tended to like stronger solutions of gum more than weak solutions and, therefore, the provision of smaller amounts of stronger concentrations is likely to be the most cost-effective way of incorporating gum into the diet. Providing gum to callitrichids on a regular basis can have significant welfare benefits.