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.

    Hard copies of all theses are available for loan at WUR Library. To request them, click the link Request this publication in the full record presentation. This is a fee based service.

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Record number 1709966
Title Behavioural motivations and abilities in broilers
show extra info.
E.A.M. Bokkers
Author(s) Bokkers, E.A.M.
Publisher [S.l. : s.n.]
Publication year 2004
Description 154 p
Description 1 online resource (154 p)
Notes Auteursnaam op omslag: Eddie Bokkersshow all notes
Met lit. opg. - Met samenvatting in het Engels en Nederlands
Proefschrift Wageningen
ISBN 908504006X
Tutors Kemp, Prof. Dr. Ir. B. ; Koene, Dr. P.
Graduation date 2004-03-05
Dissertation no. 3547
Author abstract show abstract
Broilers are chickens kept commercially under intensive husbandry conditions for poultry meat production. They grow to a slaughterweight of approximately 2.2 kg in 6 weeks. Broilers show a pronounced decrease in behavioural activity during their short life. The aim of this thesis was to gain more insight into the influence of both motivation and ability on behavioural activity in broilers. The distinction between motivation and ability is relevant for the interpretation of behavioural activity in broilers in terms of welfare. Broilers were observed when kept in pens with good facilities and in several ex situ tests where they had to work for food. Broilers showed all normal juvenile chicken behaviours, but the time spenton each behaviourhas changed. Many behavioural patterns were shown in a sitting posture instead of in a standing posture. Performance in short physical tasks depended on motivation and physical ability. Hunger and satiety mechanisms have changed compared to layer chickens, but the motivation to work for food still can be manipulated in broilers. Broilers are willing to peck a key many times or to walk long distances to obtain food rewards, but their performance seemed to be dependent on body weight. Apart from having an abnormal high motivation to eat, broilers are normal biologically functioning animals. Parallel to the effect of overweight on the quality of life in humans, the abnormal high body weight at a young age has a negative impact on the welfare of broilers. Broilers are restricted to display behaviours for which they are motivated imposed by their high motivation to eat, which is associated with their fast growth and high body weight at young age, or by environmental conditions in which they are usually kept.
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Keyword(s) broilers / poultry / animal behaviour / motivation / physical activity / physical fitness / locomotion / feeding behaviour / overeating / growth / overweight / animal welfare / poultry housing / conditioning
Categories Poultry / Animal Behaviour and Ethology / Animal Health and Welfare
Publication type PhD thesis
Language English
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