J. Anim Sci.
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J. Anim Sci. 1971. 32:605-610.
© 1971 American Society of Animal Science
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Purebred Versus Crossbred Performance as a Basis of Selection in Swine1

W. C. Wong2, W. J. Boylan and W. E. Rempel

University of Minnesota, St. Paul 55101

Abstract

An experiment in which selection was based on the specific combining ability of a three-breed cross in swine provided the data for this study. The three breeds employed were the Minnesota No. 1, the Minnesota No. 2 and the Minnesota No. 3. The specific three-breed cross, designated 2(3 x 1), was produced by mating Minnesota No. 2 males to crossbred gilts produced by mating Minnesota No. 3 males with Minnesota No. 1 females. The study provided genotypic and phenotypic information for evaluating the relative efficiency of two alternative methods of selection to improve the performance of the specific three-breed cross. The comparison of relative efficiency was made between intra-population (purebred) selection and selection for specific combining ability. Traits studied included litter size, post-weaning average daily gain, feed efficiency, backfat probe and an index value. The index included all of the above traits. The data represented measurements taken on 6,890 pigs. There were 260 and 211 purebred and crossbred sire families, respectively. A total of 181 sires had both purebred and crossbred progeny.

The significance of the variances, covariances and genetic correlations in relation to genetic improvement of a cross was discussed. The results in general indicate that intrapopulation (purebred) selection should be recommended over selection for specific combining ability for improvement in the performance of crossbred swine.

Footnotes

1 Paper No. 7152, Scientific Journal Series of the Minnesota Agricultural Experiment Station in cooperation with A.H.R.D., A.R.S., The Regional Swine Breeding Laboratory. U.S.D.A.

2 Present address: Faculty of Agriculture, University of Malaya, Pantai Valley, Kuala Lumpur, Malaya.






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Copyright © 1971 by the American Society of Animal Science.