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Development of empirical models to describe the response in lactating dairy cattle to changes in nutrient intake

Published online by Cambridge University Press:  20 November 2017

V. B. Woods ,
D. J. Kilpatrick  and
F. J. Gordon
V. B. Woods
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K
D. J. Kilpatrick
Affiliation:
Department of Agriculture for Northern Ireland, Newforge Lane, Belfast BT9 5PX, U.K
F. J. Gordon
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down BT26 6DR, U.K
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Extract

Empirical models relate nutrient inputs and outputs statistically, without considering the intervening metabolism of the animal (France and Thornley, 1984). Current rationing systems (e.g. ARC, 1980; Jarrige, 1988) are based on empirical models of energy and protein utilisation within the animal and do not enable prediction of responses to changes in nutrient inputs (Beever et al., 1991). Rook et al. (1990) had limited success in attempting to develop empirical regression models to describe the effect of nutrient input on milk constituent yields in dairy cows. The aim of the current study was therefore to use data from the literature to develop more appropriate empirical models that would allow the prediction of response in milk output and its constituent, to changes in energy intake.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 196
Copyright
Copyright © The British Society of Animal Science 2001

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References

Agricultural Research Council (ARC) 1980. The nutrient requirements of ruminant livestock, Commonwealth Agricultural Bureaux, Slough.Google Scholar
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France, J. and Thornley, J. H. M. 1984. Mathematical models in agriculture. Butterworth, London, xi–+355pp.Google Scholar
Jarrige, R. 1988. Alimentation des Bovins, Ovins et Caprins. INRA, Paris, 476pp.Google Scholar
Rook, A. J., Sutton, J.D., and France, J. 1990. Factors affecting yields of milk constituents in dairy cows. Anim. Prod., 50: (3) abstract.Google Scholar