Predicting the effects of body fatness on food intake and performance of sheep.

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Serval ID
serval:BIB_A6AAF4D70D30
Type
Article: article from journal or magazin.
Collection
Publications
Title
Predicting the effects of body fatness on food intake and performance of sheep.
Journal
The British Journal of Nutrition
Author(s)
Tolkamp B.J., Yearsley J.M., Gordon I.J., Illius A.W., Speakman J.R., Kyriazakis I.
ISSN
0007-1145
Publication state
Published
Issued date
2007
Peer-reviewed
Oui
Volume
97
Number
6
Pages
1206-1215
Language
english
Abstract
Adipose tissue produces signals that can have a profound effect on many physiological functions, including energy expenditure and food intake. The hypothesis that variation in food intake of sheep resulting from differences in animal fatness can be predicted from effects of animal fatness on energetic efficiency was subjected to three tests. First, an existing food intake model was adapted to account for effects of animal fatness, as estimated by condition score, on food intake. Parameter values were derived from data obtained with two of five treatment groups of an experiment where ewe lambs were fed either chopped hay or pelleted concentrates. The model predicted the intake of the remaining three treatment groups satisfactorily. The energy intake model was subsequently extended with a protein module based upon a Gompertz curve to simulate changes in body weight and condition score. The model predicted these changes satisfactorily for most treatment groups during the experimental period of 50 weeks. In a last test, the final body weights and body lipid contents of animals fed either hay or concentrates for a period of 3 years were predicted. The predictions for final body weight (77 or 118 kg) and lipid content in the empty body (26 or 58 %) were within the range of expectations for sheep with access to hay or concentrates, respectively. The biological implications of the hypothesis that body fatness acts upon voluntary intake via its effects on energetic efficiency are discussed.
Keywords
Adipose Tissue/anatomy &amp, histology, Adipose Tissue/physiology, Adiposity/physiology, Animal Feed, Animal Nutritional Physiological Phenomena, Animals, Body Weight/physiology, Eating/physiology, Female, Lipids/analysis, Models, Biological, Sheep, Domestic/physiology
Pubmed
Web of science
Open Access
Yes
Create date
19/11/2007 10:43
Last modification date
20/08/2019 15:11
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