J. Anim Sci.
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J. Anim Sci. 1942. 1:99-105.
© 1942 American Society of Animal Science
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Heritability of Conformation in Poland-China Swine as Evaluated by Scoring1

H. H. Stonaker and J. L. Lush2

Iowa State College

Abstract

  1. An estimate has been made of the heritability of variations in the conformation of Poland-China pigs as measured by a scoring scheme being tried by the Regional Swine Breeding Laboratory.
  2. The average score in this study of all of the pigs was 38.0 with a standard deviation of 5.1. The total variance in scores was partitioned according to source as follows: season-to-season changes in the herd average, 7 per cent; differences between the progeny averages of contemporary sires, 11 per cent; differences between litter averages, 11 per cent; and differences between litter mates, 71 per cent.
  3. The intra-sire, intra-season regression of offspring's scores on dams' scores was +.10. Doubling this yields an estimate that twenty per cent of the variation between the scores of gilts which were later mated to the same boar was due to differences in the additive effects of their genes.
  4. With the differences in scores being 20 per cent heritable and with the parents scoring 3.55 points higher than average, it can be expected that the average score of population would be increased about .71 point per generation.

Footnotes

1 Journal Paper No. J 944 of the Iowa Agricultural Experiment Station, Ames, Iowa, Project No. 32. This study was conducted in cooperation with the Bureau of Animal Industry of the United States Department of Agriculture.

2 Research fellow and professor of animal breeding, respectively.






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Copyright © 1942 by the American Society of Animal Science.