PhD theses

All Wageningen University PhD theses

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    Wageningen PhD theses

    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

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Record number 1794034
Title Cold stress and immunity: do chickens adapt to cold by trading-off immunity for thermoregulation?
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Basavarajappa Nagarajappa Hangalapura
Author(s) Hangalapura, B.N.
Publisher [S.l. : s.n.]
Publication year 2006
Description 160 p
Description 1 online resource (160 p)
Notes Met lit. opg. - Met samenvatting in het Engels en Nederlandsshow all notes
Proefschrift Wageningen
ISBN 9085043581
Tutors Kemp, Prof. Dr. Ir. B. ; Parmentier, Dr. Ir. H.K. ; Brand, Dr. Ir. H. van den
Graduation date 2006-03-01
Dissertation no. 3914
Author abstract show abstract
Future animal husbandry aims at enhanced animal welfare, with minimal use of preventive medical treatments. These husbandry conditions will resemble more natural or ecological conditions. Under such farming systems, animals will experience various kinds of stressors such as environmental (e.g. cold, heat, wind), and social stressors (e.g. pecking in chicken, competition for food). In Western Europe, environmental temperature can drop significantly below the optimal temperature needed for poultry farming during winter season. Apart from cold stress, competition for food could pose nutritional stress in future husbandry practices. Therefore, cold and nutritional stressors can pose a significant threat for poultry farming, as stressors are believed to affect health and welfare of animals. However, effects of cold and nutritional stress on health of poultry are not clearly understood. It has also been proposed that "artificial selection for a trait (e.g. growth, egg production) may program an individual to allocate a large portion of its resources to a demand, leaving it lacking the ability to respond to other demands". Therefore, the focus of this thesis was a) to understand the effects of cold and nutritional stressors on health status (immunocompetence) of two lines of chicken which have selectively been bred for high and low health status (antibody responses). b) to understand the effects of artificially selection on adaptive capacity of chickens to stressful conditions. Important findings of the present thesis are 1. both cold and nutritional stressors did not affect specific antibody responses. 2. both cold and moderate nutritional stressors have positive effect on innate immune component (e.g. phagocytic activity, natural antibody levels), both at cellular and gene levels. 3. cold stress suppresses plasma corticosterone levels in a dose dependent manner, whereas severe nutritional stress enhances plasma corticosterone levels. 4. inverse relation was found between cell mediate immune competence and plasma corticosterone levels. 5. genetic selection for a trait (e.g. selection for either high or low antibody levels) did not affect the immunological adaptive capacity of chickens to both cold and nutritional stressors. It was concluded that cold and nutritional stressors may not pose significant threat for the health of chickens in future farming conditions.
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Keyword(s) fowls / cold stress / food restriction / immunity / immune response / artificial selection / genetics / adaptation / animal health
Categories Poultry / Environmental Physiology, Stress Physiology / Immunology
Publication type PhD thesis
Language English
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