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Integration of Factors Affecting Sow Efficiency: A Modeling Approach^1,2,3,

University of Minnesota^,6, St. Paul 55108

Abstract

A dynamic, partially stochastic mathematical model describing the reproductive performance of a sow herd is presented. The model simulates a herd that averages 17.27 sow days/pig produced, with a mean of 9.06 pigs weaned/litter and 2.327 litters produced/sow each year. Several alternative options are simulated. Of these, the ones that increase the litter size at weaning appear most beneficial in terms of both biological and economic efficiencies.

¹ Published as Paper No. 14,664 of the scientific journal article series of the Minnesota Agr. Exp. Sta. on research conducted under Minnesota Agr. Exp. Sta. Project No. 4816-62, supported by Hatch funds.

² The authors express appreciation to the following individuals for information and advice in the development and use of this model: B. G. Crabo, J. D. Hawton, A. D. Leman, W. E. Marsh, W. E. Rempel, T. E. Stein, M. Bichard, J. H. Britt, R. K. Christenson, D. C. England, J. R. Corley and ]. G. Lecce.

³ Presented at the Nonruminant Nutrition Symp. entitled "Increasing Sow Efficiency" at the 77th Annu. Meet., of the Amer. Soc. of Anim. Sci., August 14, 1985, Univ. of Georgia, Athens.

⁴ Dept. of Anim. Sci.

⁵ Dept. of Agr. and Appl. Econ.

⁶ All authors are associated with the Univ. of Minnesota Swine Center.