Quantitative de-finition o-f selection objectives is -fundamental to the genetic improvement o-f production system economic performance. Total cost per unit o-f output <e-f -f i ci ency) with or without "normal pro-fit" regarded as a production cost may be used to measure economic performance. Different production/marketi ng systems may shift the distribution of production costs among segments of the life—cycle or alter the relative values of outputs. A bioeconomic model has been used to predict the physiological and economic effects\of genetic change in different systems. When pork is valued by lean weight, a single selection index may be adequate for several different systems. However, when pork is priced by weight alone, the relative importance of growth traits is very sensitive to marketing strategies (age vs. weight constant). Selection indexes to reduce cost per unit of lean are very different from indexes used to reduce cost per unit of liveweight.

M. W Tess

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 3–13, 1986
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