A Comparison of the Effects of Inbreeding and Selection on Performance in Swine

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Abstract
Factors responsible for changes in merit of inbred lines have been identified and their net effect expressed symbolically. The rate at which inbreeding can proceed without loss of merit when selection is of the intensity practiced over a period of years in lines at Minnesota has been estimated for litter size. and average daily gains. These estimates are subject to considerable error, but the theoretical and actual results were in reasonable agreement. It is concluded that litter size is much more difficult to maintain in lines being inbred than is growth rate, which is in agreement with the published results of other inbreeding experiments. Suggestions are advanced for making selection for fertility more effective. The results of this report emphasize the necessity for maximum attention to selection in the development of inbred lines of swine.

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