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Preliminary Report on Crossing of Inbred Lines of Swine¹

University of Minnesota

Abstract

A report is given on the accumulation of data on 13 lots of crosses between inbred strains of swine.

The evidence presented supports genetic theory and past experience with other species that increased vigor usually follows the crossing of inbred lines.

The degree of increased vigor was in close keeping with the decrease in the coefficient of inbreeding of the crossbreds.

Line crosses between breeds gave more increased vigor than line crosses within the Poland China breed. The amount of increased vigor resulting from line crosses between breeds rather than within a breed is in close keeping with the increased vigor resulting from the crossing of breeds of non-inbred swine in a previous experiment.

The genetic diversity of the parental stocks appears to be an important factor affecting the amount of increased vigor.

Superior lines appear to produce the superior crossbreds. There is nothing in these experiments to encourage the development of inferior inbred lines.

A comparison of the performance of the crossbreds within and between breeds, with that of selected well bred and well cared for non-inbreds lends encouragement to this method of improving swine.

¹ Paper No. 2151, Scientific Journal Series of the Minnesota Agricultural Experiment Station in cooperation with the Regional Swine Breeding Laboratory, Ames, Iowa, Bureau of Animal Industry, U. S. Department of Agriculture.