J. Anim Sci.
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J. Anim Sci. 1988. 66:2762-2766.
© 1988 American Society of Animal Science
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A Comparison of Progeny Sired by High and Low Indexing Hampshire and Duroc Central Test Station Boars: Genetic Parameter Estimation1

R. O. Bates2 and D. S. Buchanan3

Oklahoma State University, Stillwater 74078

Abstract

Data were collected on 1,762 progeny of high and low indexing Hampshire and Duroc boars purchased from Iowa, Missouri, Nebraska and Oklahoma central test stations. The criterion for choosing boars was an index (I) recommended by the National Swine Improvement Federation for central test stations. Boars were purchased in pairs; the minimum difference of the pair was 30 index points. Heritabilities and genetic correlations for I, ADG and probe backfat thickness (PBF) were calculated using regression methods, and a realized heritability for I was estimated. Regression estimates of heritability for I, ADG and PBF were .65 ± .40, .52 ± .20 and .43 ± .25, respectively. The realized heritability estimate for I was .16 ± .08, which may better reflect commercial progeny performance of boars purchased from a central test station than the regression estimate. The genetic correlations of I with ADG and PBF were moderate and favorable (.53 ± .13 and –.69 ± .18, respectively), whereas the genetic correlation of ADG and PBF was moderate and positive (.44 ± .14). Regressions of sire predicted differences, estimated by BLUP, on central test station performance for I, ADG and PBF were .066 ± .029, .081 ± .039, and +.145 ± .098, respectively. The regressions of ADG and PBF on I were .267 ± .157 and –.008 ± .006, respectively, and the regression of PBF on ADG was –.001 ± .002.

Footnotes

1 Published Paper No. 5292 Journal Series, Oklahoma Agric. Exp. Sta., Stillwater, and a contribution to Regional Project NC-103, Genetic Improvement of Efficiency in the Production of Quality Pork.

2 Present address: Anim. Sci. Dept., Univ. of Missouri, Columbia 65211.

3 Anim. Sci. Dept. Oklahoma State Univ., Stillwater 74078.






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Copyright © 1988 by the American Society of Animal Science.