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Heritabilities and Genetic Correlations of Carcass and Growth Traits in Swine¹

Iowa State University of Science and Technology, Ames 50010²

Abstract

Carcass and growth data for 3,439 purebred pigs were used in this study. Four methods of accounting for nongenetic effects were described and used to obtain genetic parameter estimates from sire components. Some of the problems encountered while employing the different methods are discussed and the different sets of parameter estimates are characterized and compared. The estimates using the complete data set are biased downward by the progeny test selection and upward by the age dependent assortative mating. The bias due to non-random mating appears to be of greater magnitude than that due to progeny test selection since the estimates not influenced by selection and non-random mating are smaller than those from the complete data set. The heritabilities for loin eye length, loin eye depth, loin eye area, ham and loin percentage, 154-day weight, weaning weight, and backfat are about 0.60, 0.60, 0.70, 0.35, 0.25, 0.15 and 0.25, respectively. The genetic correlations generally agree with published estimates.

¹ Journal Paper No. 6670 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1127.

² Department of Animal Science.