title: The Relation Between Preference and Demand in the Domestic Hen: Does Preference Vary With Price?

authors: Bruce, Julie-Anne Marie

subjects: Preference

abstract: ABSTRACT

Six hens responded under an increasing Fixed Ratio schedule of reinforcement to assess demand separately for two different food types: wheat and puffed wheat.  Demand curves generated showed the least preferred food, puffed wheat, yielded a higher initial (ln L) demand than the more preferred food, wheat.  While responding for the more preferred food, wheat, produced lower initial (ln L) demand functions, responding for wheat was maintained to higher increasing FR schedules of reinforcement than was that for puffed wheat.  This phenomenon occurred across all six hens.  To assess preference between the two food types the hens responded under a two-link concurrent-chain schedule of reinforcement.  Under the concurrent-chain schedule of reinforcement there were three conditions, each consisted of a initial link with VI 90-s VI 90-s in effect, and terminal links of FR1, FR8 and FR32.  The concurrent-chain schedule was used to examine if or how preference may relate to demand.  Preference measures obtained showed wheat was generally preferred to puffed wheat across all prices throughout the preference assessment.  As price increased in the terminal link during the preference assessment, preference for wheat became more extreme as did the hens responding.  The results suggest that while there is a systematic relation between preference and demand, in that at higher FR values food with higher demand levels is preferred.  This does not seem to hold, however, at FR1

text: The Relation Between Preference and Demand in the Domestic Hen: Does Preference Vary With Price? ABSTRACT

Six hens responded under an increasing Fixed Ratio schedule of reinforcement to assess demand separately for two different food types: wheat and puffed wheat.  Demand curves generated showed the least preferred food, puffed wheat, yielded a higher initial (ln L) demand than the more preferred food, wheat.  While responding for the more preferred food, wheat, produced lower initial (ln L) demand functions, responding for wheat was maintained to higher increasing FR schedules of reinforcement than was that for puffed wheat.  This phenomenon occurred across all six hens.  To assess preference between the two food types the hens responded under a two-link concurrent-chain schedule of reinforcement.  Under the concurrent-chain schedule of reinforcement there were three conditions, each consisted of a initial link with VI 90-s VI 90-s in effect, and terminal links of FR1, FR8 and FR32.  The concurrent-chain schedule was used to examine if or how preference may relate to demand.  Preference measures obtained showed wheat was generally preferred to puffed wheat across all prices throughout the preference assessment.  As price increased in the terminal link during the preference assessment, preference for wheat became more extreme as did the hens responding.  The results suggest that while there is a systematic relation between preference and demand, in that at higher FR values food with higher demand levels is preferred.  This does not seem to hold, however, at FR1

year: 2007

title: Biophysical, environmental, and economic implications of removing imported supplementary feed from a pasture-based dairy farm system - An upper North Island case study

authors: McCahon, Kieran Shaun

subjects: Palm kernel expeller

abstract: The biological efficiency and profitability of pasture-based systems is optimised by matching pasture supply with the nutritional demands of the herd across the year. Despite the importance of grazed pasture to the profitability of pasture-based systems, the use of purchased (i.e., non-pasture) feeds (supplementary feeds) has increased considerably over the last two decades within the New Zealand (NZ) dairy industry. 
Supplementary feeds may be offered to maintain or increase dry matter intake (DMI) and milk production during periods when pasture supply is insufficient to meet herd demands (i.e., a pasture deficit). However, published results indicate that, despite greater milk production and gross farm revenue (GFR), imported supplementary feed is not associated with an increase in profitability. In addition, the intensification of grazing systems through concurrent increases in stocking rate (SR) have been associated with poorer environmental outcomes, such as reduced water quality and increased greenhouse gas (GHG) emissions. 
The primary objective of my Masters project was to investigate the biophysical, economic, and environmental effects of removing imported supplementary feed from a typical pasture-based system in the upper North Island of New Zealand. This was conducted over three years in Northland, New Zealand (35⁰56’39”S 173⁰50’34”E), using a quantitative case-study approach that compared three pasture-based dairy farming treatments differing in SR and the nature of feed supply. As a Control treatment, imported supplementary feed was offered as palm kernel expeller (PKE) during periods of pasture deficit (~ 550kg DM/cow/yr; ~ 10% of the cows’ diet; PKE treatment). This was compared with two alternative systems to remove the need for PKE: 1) reduced SR (Pasture treatment); or, 2) growing potentially high yielding forage crops on the dairy platform and maintaining SR (Cropping treatment). I used the nutrient budgeting software OVERSEER to model treatment effects on nitrogen (N) leaching, phosphorous (P) loss, and GHG emissions. In addition, I conducted a Monte Carlo analysis to investigate economic performance of all three treatments and how it varied over a range of key input prices.
On average, despite no significant difference in milk production, operating profit tended to be lower in the Cropping treatment relative to the PKE treatment. In addition, after accounting for variability in market prices, the Cropping treatment returned a lower operating profit at every probability level relative to the PKE treatment and was, therefore, an inferior system for a profit-focused decision maker.
Milk production and associated GFR were lower in the Pasture treatment compared with the PKE treatment; however, there was no effect of treatment on operating profit at average market prices. When accounting for potential market price variability, the PKE treatment returned a greater operating profit in 70% of scenarios. As a result, the PKE treatment would likely provide a preferable system for a profit-focused decision maker, with low to moderate risk aversion. However, the relative profitability of treatments was highly dependent on the marginal milk production response (MMPR) to supplementary feed. Consistently large MMPRs to supplementary feed were achieved in the current study: 30 to 50% greater than published farm systems experiments. A reduction in the MMPR to supplementary feed by 10% eroded the profit advantage of the PKE treatment. In addition, despite no treatment effect on N leaching, GHG emissions tended to be lower in the Pasture treatment relative to the PKE treatment. As a result, a decision maker, paying or receiving incentives to reduce environmental externalities would likely be indifferent between the PKE and Pasture treatments, even with the large MMPR to supplementary feed achieved in the current study. Depending on the potential response to supplementary feed, profitability may be maintained with the removal of imported supplementary feeds from a pasture based system by decreasing SR.

text: Biophysical, environmental, and economic implications of removing imported supplementary feed from a pasture-based dairy farm system - An upper North Island case study The biological efficiency and profitability of pasture-based systems is optimised by matching pasture supply with the nutritional demands of the herd across the year. Despite the importance of grazed pasture to the profitability of pasture-based systems, the use of purchased (i.e., non-pasture) feeds (supplementary feeds) has increased considerably over the last two decades within the New Zealand (NZ) dairy industry. 
Supplementary feeds may be offered to maintain or increase dry matter intake (DMI) and milk production during periods when pasture supply is insufficient to meet herd demands (i.e., a pasture deficit). However, published results indicate that, despite greater milk production and gross farm revenue (GFR), imported supplementary feed is not associated with an increase in profitability. In addition, the intensification of grazing systems through concurrent increases in stocking rate (SR) have been associated with poorer environmental outcomes, such as reduced water quality and increased greenhouse gas (GHG) emissions. 
The primary objective of my Masters project was to investigate the biophysical, economic, and environmental effects of removing imported supplementary feed from a typical pasture-based system in the upper North Island of New Zealand. This was conducted over three years in Northland, New Zealand (35⁰56’39”S 173⁰50’34”E), using a quantitative case-study approach that compared three pasture-based dairy farming treatments differing in SR and the nature of feed supply. As a Control treatment, imported supplementary feed was offered as palm kernel expeller (PKE) during periods of pasture deficit (~ 550kg DM/cow/yr; ~ 10% of the cows’ diet; PKE treatment). This was compared with two alternative systems to remove the need for PKE: 1) reduced SR (Pasture treatment); or, 2) growing potentially high yielding forage crops on the dairy platform and maintaining SR (Cropping treatment). I used the nutrient budgeting software OVERSEER to model treatment effects on nitrogen (N) leaching, phosphorous (P) loss, and GHG emissions. In addition, I conducted a Monte Carlo analysis to investigate economic performance of all three treatments and how it varied over a range of key input prices.
On average, despite no significant difference in milk production, operating profit tended to be lower in the Cropping treatment relative to the PKE treatment. In addition, after accounting for variability in market prices, the Cropping treatment returned a lower operating profit at every probability level relative to the PKE treatment and was, therefore, an inferior system for a profit-focused decision maker.
Milk production and associated GFR were lower in the Pasture treatment compared with the PKE treatment; however, there was no effect of treatment on operating profit at average market prices. When accounting for potential market price variability, the PKE treatment returned a greater operating profit in 70% of scenarios. As a result, the PKE treatment would likely provide a preferable system for a profit-focused decision maker, with low to moderate risk aversion. However, the relative profitability of treatments was highly dependent on the marginal milk production response (MMPR) to supplementary feed. Consistently large MMPRs to supplementary feed were achieved in the current study: 30 to 50% greater than published farm systems experiments. A reduction in the MMPR to supplementary feed by 10% eroded the profit advantage of the PKE treatment. In addition, despite no treatment effect on N leaching, GHG emissions tended to be lower in the Pasture treatment relative to the PKE treatment. As a result, a decision maker, paying or receiving incentives to reduce environmental externalities would likely be indifferent between the PKE and Pasture treatments, even with the large MMPR to supplementary feed achieved in the current study. Depending on the potential response to supplementary feed, profitability may be maintained with the removal of imported supplementary feeds from a pasture based system by decreasing SR.

year: 2019

title: A Relationships Framework for Organisational Responsiveness to Te Tiriti/Treaty of Waitangi in the Work of Groups and Organisations in the Community and the Public Sector of Aotearoa New Zealand

authors: Spelman, Anthony Cyril

subjects: Organisation Development

abstract: This thesis is focussed on the development and implementation of a Relationships Framework based on Te Tiriti/Treaty of Waitangi.  The Framework has been designed to enable working together between Tangata Whenua and Tangata Tiriti in the community and Public Sector in Aotearoa New Zealand.  Its development is explored and its implementation critiqued.  Within that Framework, an original organisation development tool based on a Tiriti/Treaty two-worldview approach is examined in terms of its potential to facilitate change in the operation and management of public life in Aotearoa New Zealand.
My aim is to establish an effective approach for working with worldview difference in the context of Tiriti/Treaty of Waitangi relationships and their implications.  I have a belief that Tangata Whenua are currently excluded from participating in processes that govern public life due to the dominance of Tangata Tiriti worldviews.  Therefore I am committed to making a contribution to a change in this dynamic so that Tangata Whenua views are not only heard but form an integral part of how the infrastructure of our public life is developed and managed. 
The Tiriti/Treaty of Waitangi Relationships Framework [The Framework] presented in the thesis is critiqued in two ways: i) through an examination of the concepts that inform it, and ii) by exploring six examples of its operation and further development in the community and public sector in Aotearoa New Zealand.  The Framework and the Tiriti/Treaty Two-worldview approach used to inform it has worked effectively in a variety of settings.  Through my research I show that organisation development of this type is complex.  It appears that there need be no fixed starting point in the development process within an organisation.  However all key elements of that process must eventually be addressed if effective relationships are to be achieved and the resulting organisational change is to be sustained.  Commitment to organisation development of this type is therefore long-term and requires a commitment to leading and supporting change in behaviour, systems and processes, and structures.

text: A Relationships Framework for Organisational Responsiveness to Te Tiriti/Treaty of Waitangi in the Work of Groups and Organisations in the Community and the Public Sector of Aotearoa New Zealand This thesis is focussed on the development and implementation of a Relationships Framework based on Te Tiriti/Treaty of Waitangi.  The Framework has been designed to enable working together between Tangata Whenua and Tangata Tiriti in the community and Public Sector in Aotearoa New Zealand.  Its development is explored and its implementation critiqued.  Within that Framework, an original organisation development tool based on a Tiriti/Treaty two-worldview approach is examined in terms of its potential to facilitate change in the operation and management of public life in Aotearoa New Zealand.
My aim is to establish an effective approach for working with worldview difference in the context of Tiriti/Treaty of Waitangi relationships and their implications.  I have a belief that Tangata Whenua are currently excluded from participating in processes that govern public life due to the dominance of Tangata Tiriti worldviews.  Therefore I am committed to making a contribution to a change in this dynamic so that Tangata Whenua views are not only heard but form an integral part of how the infrastructure of our public life is developed and managed. 
The Tiriti/Treaty of Waitangi Relationships Framework [The Framework] presented in the thesis is critiqued in two ways: i) through an examination of the concepts that inform it, and ii) by exploring six examples of its operation and further development in the community and public sector in Aotearoa New Zealand.  The Framework and the Tiriti/Treaty Two-worldview approach used to inform it has worked effectively in a variety of settings.  Through my research I show that organisation development of this type is complex.  It appears that there need be no fixed starting point in the development process within an organisation.  However all key elements of that process must eventually be addressed if effective relationships are to be achieved and the resulting organisational change is to be sustained.  Commitment to organisation development of this type is therefore long-term and requires a commitment to leading and supporting change in behaviour, systems and processes, and structures.

year: 2013