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Journal of Animal Science, Vol 70, Issue 12 3762-3773, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Evaluation of a mathematical model of lactating sow metabolism

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

A mathematical model of lactating sow metabolism was evaluated using three types of tests. First, 16 experimental treatments from four experiments reported in the literature were simulated with the model, and the simulated values for change in BW and protein and fat content were compared to reported or calculated values. Second, the model's response to level of feed intake, level of milk production, BW and composition at farrowing, and dietary lysine concentration was compared to expected responses. Third, the model's sensitivity to changes in several of its kinetic parameters was measured. There was good agreement between simulated and measured values for BW and fat loss and reasonable agreement for body protein loss. All responses to changes in external conditions were in expected directions and biologically reasonable. The model seemed rather robust with respect to changes in the kinetic parameters considered, although important changes in simulated values were found in some cases. Overall, the model seems sound. It can be useful in evaluation of feeding programs and in understanding biological relationships.


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J. P. McNamara and J. E. Pettigrew
Protein and fat utilization in lactating sows: I. Effects on milk production and body composition
J Anim Sci, September 1, 2002; 80(9): 2442 - 2451.
[Abstract] [Full Text] [PDF]

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 J ANIM SCIHome page
J. P. McNamara and J. E. Pettigrew
Protein and fat utilization in lactating sows: II. Challenging behavior of a model of metabolism
J Anim Sci, September 1, 2002; 80(9): 2452 - 2460.
[Abstract] [Full Text] [PDF]


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Copyright © 1992 by the American Society of Animal Science.