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Journal of Animal Science, Vol 70, Issue 12 3742-3761, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

A mathematical integration of energy and amino acid metabolism of lactating sows

J. E. Pettigrew, M. Gill, J. France and W. H. Close
Department of Animal Science, University of Minnesota, Saint Paul 55108.

A dynamic mathematical model of energy and protein metabolism of lactating sows is described in this article. The model is designed to contribute to a systematic and quantitative understanding of the biological connection between diet and reproduction. It traces the flow of energy-containing nutrients from absorption through intermediary metabolism, into and out of body stores, and into milk. State variables (pools) include lysine, other amino acids, glucose, fatty acids, acetate, propionate, acetyl-coenzyme A, ATP, oxygen, carbon dioxide, urea, lean-body protein, visceral protein, storage triacylglycerol, milk protein, milk triacylglycerol, and milk lactose. The rate of each transaction is a function of substrate and inhibitor concentrations, assuming saturable kinetics. Protein and fat turnover, substrate cycles, and the energy cost of membrane transport are explicitly considered. Dynamic simulation of a complete lactation is accomplished by iterating the numerical integration of 16 first-order, nonlinear differential equations, each associated with a pool. Most kinetic parameters were estimated indirectly. Preliminary tests suggest the model is sound. It promises to be useful as a research tool and, with further development, as a guide to practical feeding strategies.


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Copyright © 1992 by the American Society of Animal Science.