bluuebunny/crossref_metadata_2025_split huggingface dataset:
74 Lessons from the COVID-19 Pandemic for Food Supply Chains
Authors: Anderson John D , Maples Josh , Mitchell James 
Published: October 2021

Abstract
The COVID-19 pandemic and the associated policy responses to it were highly disruptive of supply chains throughout the economy in 2020 – disruptive on an unprecedented scale. Massive shocks on both the demand and supply sides of the market presented particular challenges in agricultural product markets. These were arguably most pronounced in the protein sector. This paper will examine these protein sector supply chain shocks, exploring the nature and causes of the market disruptions during the height of the pandemic, evaluating the effects of these shocks from an economic perspective, and identifying potential market and policy responses that could mitigate the adverse effects of similar events in the future.
76 Cattle Production’s Response to Packing Capacity Disruption
Authors: Holland Ben P , Wesley Kaitlyn R , Word Alyssa B , Maxwell Casey 
Published: October 2021

Abstract
In August 2019, a fire at Tyson’s Finney County, Kansas, beef plant removed approximately 5% of U.S. beef packing capacity for 3 months. Subsequent COVID-19 pandemic-related precautions and workforce illness caused multiple packing plants across the country to decrease or stop production in the spring of 2020. Both events resulted in feedlots being unable to ship cattle at optimal finish points or according to projection. Estimates of the number of cattle backlogged during 2020 approach 1 million. Producers were faced with decisions on how to manage finished animals that could not be shipped while considering economic, animal welfare, and animal health outcomes. Many factors further complicated the situation including highly volatile markets, the possibility employee quarantine due to personal or family illness would cause operations to be under-staffed, and shortage of available pens for new cattle. Feeders had the option to slow the rate of growth of finished cattle due to the ability of ruminant animals to utilize low-energy feedstuffs or by calculating programmed rates of gain using the net energy system. Instead, many producers chose to attempt maximal rates of gain hoping persistent growth and feeding margins would offset discounts due to heavy carcass weights and excess fatness when the supply chain began moving again. Regarding new placements, the structure of the beef industry is uniquely developed to absorb cattle in stocker and backgrounding operations. This presentation will review the factors impacting cattle production and provide case-studies related to feeding at maintenance and growth rates, efficiencies, and carcass outcomes of held cattle from an operation and industry level.
92 Maternal Nutrient Restriction of Primiparous Beef Heifers During Late Gestation Decreases Colostrum Yield and Reduces Calf Vigor
Authors: Wichman Lindsey G , Redifer Colby A , Davies Shelby L , Meyer Allison M 
Published: October 2021

Abstract
We hypothesized that late gestational nutrient restriction (NR) would reduce colostrum yield and impair offspring transition to postnatal life. Primiparous, fall-calving crossbred beef heifers (BW: 451 ± 28 [SD] kg; BCS: 5.4 ± 0.7) were individually-fed either 100% (control; CON; n = 12) or 70% (n = 13) of NASEM net energy and metabolizable protein requirements for maintenance, pregnancy, and growth from d 160 of gestation to parturition. Delivery duration was determined as minutes from first fetal feet expulsion to birth. Calves were reared naturally by their dams and monitored for times from birth to first sternal recumbency, attempt to stand, and stand; vigor scores (1 = very weak, 5 = extremely vigorous) were assigned at 2, 5, 10, and 20 min of age. Total colostrum from one rear quarter was collected pre-suckling. Calf rectal temperatures were recorded at 0, 6, 12, 24, and 48 h postnatally. Data were analyzed with the fixed effects of treatment (single point) or treatment, hour, and their interaction (over time, using repeated measures). Date of calving was a fixed effect; calf sex was included when P &lt; 0.25. Heifers fed CON had greater (P = 0.04) colostrum weight and volume than NR. Although gestational nutrition did not affect (P = 0.72) calf birth weight, calves born to CON heifers had faster (P = 0.02) times to stand and tended to have faster (P = 0.09) times to attempt to stand. Calves from CON heifers had greater (P = 0.05) 20 min vigor scores. Rectal temperatures at 0 h were greater (P = 0.02) in CON calves, but at 24 h were greater (P = 0.04) in NR calves. These data indicate that heifers nutrient restricted during late gestation have reduced colostrum yield and less vigorous calves, which may influence postnatal calf survival.
89 Relationships Among Measures of Efficiency with Body Weight, Frame Score, and Body Volume in Lactating Multiparous Crossbred Beef Cattle
Authors: Mosher Macie K , Olorunkoya Samuel , Bhowmik Nayan , Ringwall Kris A , Hanna Lauren L Hulsman , Swanson Kendall C 
Published: October 2021

Abstract
Sixty cows of varying frame scores (FS; 5.17 ± 1.38) were used to examine relationships between body size [BW, FS, and body volume (V)] and cow efficiency. Dry matter intake (DMI) and BW change were monitored over 64 days starting 1 month before bull turnout. Cows were fed a forage-based diet and DMI monitored using the Insentec system. Average BW (ABW; 662 ± 93.3 kg) was calculated by averaging 2-d beginning and end BW. Measurements (body length, hip height, hip width, and heart, mid, and flank girth) were collected at the beginning and end of the experiment and average V (628 ± 96.4 L) calculated. Calf BW was recorded at weaning (WW). Pearson partial correlations between body size characteristics and efficiency measures were determined using GLM (SAS) and the MANOVA/PRINTE statement. There was positive correlation (P &lt; 0.001; r = 0.84, 0.74, 0.81) between DMI (kg) and ABW, FS, and V. There was a tendency for negative correlation (P = 0.08, 0.09; r = -0.24, -0.23) between DMI (% of BW) and ABW and V. There was positive correlation (P ≤ 0.05; r = 0.33, 0.28, 0.26) between WW (kg) and negative correlation (P &lt; 0.001; r = -0.63, -0.57, -0.65) between WW (% of ABW) and ABW, FS, and V. There was positive correlation (P = 0.04; r = 0.26) between calf ADG and ABW, and a tendency for positive correlation (P = 0.09; r = 0.23) between calf ADG to weaning and FS. The observed correlations suggest that larger cows consume more kg of feed and wean heavier calves with greater ADG to weaning, whereas smaller cows tend to consume more feed as a percentage of BW and wean a greater percentage of cow BW. Further research is needed on the complex relationship between cow size and efficiency.
88 Impacts of Body Condition Score at Initiation of the Breeding Season on Reproductive Performance and Overall Productivity of Bos Taurus and B. Indicus Beef Cows
Authors: Brandão Alice , Cooke Reinaldo F , Lamb G Cliff C , Vasconcelos José Luiz , Pohler Ky G 
Published: October 2021

Abstract
Responses of Bos taurus (BT) and B. indicus (BI) beef cows were compared according to their body condition score (BCS) at initiation of breeding season. Cows were assigned to an estrus synchronization + AI protocol and classified as BCS &lt; 5.0 (LBCS, BT, n = 158; BI, n = 248) or BCS ≥ 5.0 (HBCS; BT, n = 173; BI, n = 122). Pregnancy status was verified via transrectal ultrasonography at 30 and 40 d after AI for BI and BT cows, respectively. All BT cows were exposed to natural service for 50 d (beginning 18 d after AI), and all non-pregnant BI cows were immediately exposed to natural service for 60 d. Pregnancy rates to AI did not differ (P ≥ 0.16) between HBCS or LBCS cows (60.9 vs. 53.5% for BT; 37.0 vs. 31.4% for BI; respectively). Pregnancy rates to natural service were greater (P = 0.03) in HBCS BT cows compared with LBCS (82.7 vs. 67.9%; respectively) but did not differ in BI cows (78.9 vs. 71.5%; respectively). Calving rate was greater (P &lt; 0.03) in HBCS cows, which also calved earlier (P &lt; 0.01) compared with LBCS (93.7 vs. 85.1% in BT, 83.6 vs. 73.3% in BI; respectively). HBCS Cows weaned more (P ≤ 0.05) calves compared with LBCS, which were older (P ≤ 0.04) (215 vs. 211 d in BT, 219 vs. 209 d in BI; respectively) and heavier (P ≤ 0.09) at weaning (258 vs. 252 kg in BT, 213 vs. 203 d in BI; respectively). Lastly, kg of calf weaned/cow was greater (P ≤ 0.03) in HBCS cows compared with LBCS (221 vs. 200 d in BT, 159 vs. 129 d in BI; respectively). Therefore, HBCS cows had greater reproductive efficiency and overall productivity, and this was observed in both BT and BI.
106 The Effects of Fetal Programming on Offspring Pancreas DNA Methylation
Authors: Hoffman Maria L 
Published: October 2021

Abstract
It has been well documented that fetal programming, caused by changes to the maternal environment during pregnancy, can impact the overall health and growth of the offspring in livestock and non-livestock species alike. These effects are observed in the F1 offspring as well as across subsequent generations; however, the mechanisms by which this occurs are still poorly understood. Epigenetics is one of the many mechanisms that is hypothesized to have a role in fetal programming and may be mediating the observed effects across multiple generations. It has been demonstrated by others that DNA methylation patterns can be altered by an individuals’ diet and that the pancreas is vulnerable to the effects of fetal programming. Therefore, we evaluated the effects of poor maternal nutrition during gestation on the pancreas tissue of lambs. We have demonstrated that maternal under- or overnutrition during gestation alters the DNA methylation patterns of the offspring pancreas tissue with these effects being diet dependent and sex specific. We have also begun evaluating the effects of maternal diet in murine models using whole-genome bisulfite sequencing to compare species differences and determine if there are any changes conserved across species. This will allow us to focus on a smaller number of critical factors in individuals as they age and across multiple generations in livestock species such as sheep and cattle. From these data we will be able to elucidate the role DNA methylation has in mediating the effects of maternal programming in the pancreas tissue.
105 The Epigenetics and Plasticity of CD4+ T Cells in Poultry Health
Authors: Song Jiuzhou , He Yanghua , Ding Yi , Tian Fei , Zhao Keji , Zhang Huanmin , Yu Ying , Yang Ning , Lian Ling , Luo Juan , Mitra Apratim 
Published: October 2021

Abstract
Marek’s disease (MD) is one of the top priority diseases in chicken. The mechanisms through which immune cells react to virus infection and pathway signals represent the fundamental cell biological question to defeat MD. We hypothesized epigenetic status in immune organs and cells is directly associated with how the Marek’s disease virus (MDV) infection influences intrinsic transcriptional and regulatory networks in MD. To investigate the epigenetics in CD4+ T cells induced by MDV infection, we assembled a multifaceted approach with epigenetics, deep sequencing, and computational methods together to explore the roles of epigenetics in unique inbred lines of chickens. First, a genome-wide transcriptome analysis in the immune organs from resistant line 63 and susceptible line 72 chickens was performed to explore disease resistance mechanisms. MDV infection influences both cytokine-cytokine receptor interaction and cellular development in resistant and susceptible chickens. Second, we examined the epigenetic status of CD4+ T cells induced by MDV infection, including DNA methylations, histone modifications, chromatin accessibility, and 3D chromatin structures. Our results revealed more than 5,000 epigenetic modification changes (FDR&lt; 0.01) and methylation changes (&gt;15,000, FDR&lt; 0.01) caused by MDV infection. Only resistant line 63 chickens could initiate robust adaptive immune responses at the transcription level (&gt;200 genes, FDR&lt; 0.05). The increase in chromatin accessibility (P &lt; 0.001) and chromosome reorganization represented by A/B compartment flipping were related to up-regulated genes induced by MDV infection ten days post-infection in line 63 chickens. Our findings provided a deeper insight into the CD4+ T cell commitment and responses toward viral infection. In particular, the identifications of cis-acting and trans-acting regulations and lipid pathways will improve our understanding of the sequence, structural basis of RNA-protein, and RNA-DNA interactions and serve as the impetus for mechanistic studies to refine the genomic and epigenetic control of MD resistance in poultry.
114 Evaluation of Extrusion Processing Method and Protein Source on Standardized Amino Acid Digestibility
Authors: Hsu Clare , Davenport Gary , Rokey Galen , de Godoy Maria R 
Published: October 2021

Abstract
While the majority of dry complete and balanced foods for pet animals are extruded, the interaction between ingredient matrix and processing methods and stages are poorly understood. Thus, the objective of this study was to determine how the use of plant-based and poultry-based proteins processed under different extrusion condition may affect amino acid digestibility in extruded canine diets using a rooster model. Eight diet formulas were made using chicken (CK), chicken byproduct meal (CM), yellow pea (YP), green lentil (GL), and garbanzo bean (GB) as the primary protein sources. These diets were extruded through a single-screw and a twin-screw extruder. Food samples were collected at various stages of processing (i.e., raw, and after preconditioner, extruder, drier, and coating). Four cecectomized single-comb White Leghorn roosters were used for each diet sample. The roosters were fasted for 26 h and then fed with the treatment diets. The excreta were collected 48 h after feeding. Freeze dried excreta were used to calculate standardized amino acid digestibility (SAAD). For all essential amino acids, a significant interaction (P &lt; 0.05) between diet and processing method was observed. The SAAD of arginine, tryptophan, and methionine were greater than 80% for all diets collected at the end of the extruder. The CK diet supplemented with synthetic taurine and processed through twin-extrusion had 70% to 80% SAAD of histidine, isoleucine, leucine, lysine, phenylalanine, threonine, and valine. Overall, twin-screw extrusion resulted in lower SAAD for all essential amino acids (P &lt; 0.05), except for isoleucine and valine. However, the differences were smaller than 2.5%, and therefore may not negatively impact diet formulation and final product nutrient composition or guaranteed analysis. In addition, the extruded canine diets made with plant-based protein did not have lower amino acid digestibility than those made with animal-based protein.
126 Animal Supplements: Market Trends, Benefits and Limitations of Academic Research, and Regulatory Considerations in Product Development
Authors: Bookout Bill 
Published: October 2021

Abstract
Market research shows that U.S. consumers spend approximately $2.5 billion annually purchasing products that are similar to human dietary supplements, but intended for use in dogs, cats, and horses. Demand for these types of products is projected to grow 3% - 5% per year for the next several years. This presentation will examine the animal supplement market and provide insight into the trends that are driving its growth, many of which closely follow trends in human dietary supplements. In addition, this presentation will look at the benefits and limitations of industry sponsored research to verify the safety and efficacy of currently available animal health and nutritional supplements. Three main considerations must be weighed against the exorbitant expense of conducting clinical studies that satisfy the rigors of the scientific community: limitations on claims; lack of intellectual property protection; and the potential influences of similar products that may be available on the human side. Finally, the presentation will delve into the one area that cannot be overlooked when developing new animal health and nutritional supplements—the regulatory requirements that must be satisfied to take a product successfully to market. Any company producing animal health and nutritional supplements should be following current good manufacturing practices (cGMPs), however, since the Dietary Supplement Health and Education Act of 1994 (DSHEA) does not apply to animals, it is important to understand the standards that should be considered when marketing these types of products.
134 Effect of Sow Nutrition on Offspring’s Gut Microbiota
Authors: Everaert Nadia 
Published: October 2021

Abstract
In mammals, fetal development is programmed by the mother’s metabolism, body condition and health status, and thus by her diet. Besides this nutritional programming, the diet of sows has also an impact on her intestinal microbiota and on colostrum and milk production and composition, which may then modulate the microbiota of piglets. Indeed, colostrum and milk are composed of macronutrients, but contain as well immunoglobulins and immune cells, bioactive molecules such as hormones, growth factors, prebiotic and antimicrobial compounds. The latter two also play a role on the establishment of the gut microbiota. Moreover, the contact of the piglets with the faeces of the sows, at birth and during the lactation period, may all affect the composition of their microbiota. As a proof-of-concept concerning this microbiota modulation, it was shown that maternal antibiotic treatment from 10 days before the estimated farrowing date until 21 days after farrowing, transiently modified both mother fecal and offspring ileal microbiota during the first weeks of life, without effects on offspring’s microbiota on a long-term. There is evidence, although limited, that dietary fibers in the diet of the sows modulate the microbiota and gut homeostasis of the progeny. This has been shown by the use of seaweed extracts, short chain fructo-oligosaccharides, wheat bran, resistant starch, or the inclusion of guar gum and cellulose. For example, wheat bran in the diet of sows modulates the microbiota of the sows and piglets differently. Supplementation of the sow’s diet with probiotics (Bacillus subtilis) also revealed that the development of the intestinal microbiota of piglets is modulated, seen by a reduction in pathogenic communities (i.e. Escherichia coli, Clostridium perfringens) in colon and ileum respectively. In conclusion, to optimize piglet’s gut development through the colonization of the microbiota, the diet of the sow should be taken into account.
133 The Potential for Maternal Nutrition to Influence, Health, Development and Subsequent Lifetime Performance of the Pig
Authors: Vigors Stafford , Sweeney Torres , O’Doherty John 
Published: October 2021

Abstract
The global population is continuing to grow at a rapid rate leading to increased need for meat and milk products. The pig industry will need to adapt and expand to meet this demand. Improving the productivity of the pig industry is therefore vital in ensuring sustainable growth in the future. The use of dietary additives is a means to improve this animal productivity, however, the most appropriate time to provide dietary additives to ensure maximum benefit with the lowest cost is an area that warrants further exploration. The early-life period is a vital time of physiological, transcriptional, and microbial changes that have a stark impact on lifetime productivity. This early lifetime point provides an opportunity to aid development and impart lifetime alterations and improve animal productivity and health. These changes can be applied by dietary and management interventions to the pig itself or to the dam. The dam is a key influence on the development of the progeny as the primary site of microbial inoculation and is therefore, an interesting target for dietary intervention. With increased legislative and environmental constraints through the ban on antibiotics and the phasing out of zinc-oxide in the EU, there is a need to identify viable natural alternatives to increase productivity particularly in the post weaning period. A wealth of chemodiversity exists in nature in plants and animals developing protective molecules to survive in varying complex biosystems. Our research has established the potential of feeding naturally sustainable bioactives to improve animal performance and health. This talk will explore the strategy of feeding these natural bioactives to the dam to improve lifetime performance of the progeny.
137 Optimizing Animal Welfare in a Socially Acceptable and Sustainable Manner: The ASAS Grand Challenge That Requires Moral Self-reflection and Scientific Calibration
Authors: Daigle Courtney L , Meneses Xandra Christine A , Swanson Janice 
Published: October 2021

Abstract
Animal welfare often engages diverse values and ethics including those of citizens, consumers, scientists, and farmers. Consequently, AW is one of the seven grand challenges (GCs) identified by the ASAS Public Policy Committee (PPC). Societal concerns can lead to public policy decisions at the state or federal level that impact animal agriculture. The ASAS PPC GCs on animal welfare will be examined, progress evaluated, and recommendations made for setting research priorities. Five key questions and their corresponding expected outcomes were identified to advance AW in the GC areas of sustainable management practices, genetic markers, pain mitigation, transportation, and humane euthanasia/depopulation. The diversity of disciplines required to address these key questions is astounding. A five-year window (2015-present) was used to evaluate each key question and outcome. The published peer-reviewed literature and the North Central 1029 and Western 3173 multi-state project station reports served as the foundation for our evaluation. In brief, research opportunities exist to identify new methods and technologies to improve livestock transportation, humane endpoints for emergency depopulation, and management practices enhancing the sustainability footprint of livestock; and there is an urgent need to identify effective preventative measures against heat stress. The investigation of effective methods for species-specific pain assessment and mitigation strategies should continue to be a priority and include the development of alternative practices that avoid pain. Research into genetic markers associated with various aspects of animal wellbeing is growing and offers ample opportunity to improve animal welfare. Animal welfare research also requires scientists to engage with stakeholders to maintain perspective. One example is demonstrated by members of NC 1029 who report engagement in over thirty advisory boards across the supply chain. Through this type of engagement, animal scientists can influence the food supply system and serve as a conduit between social concerns, policy, and science.