J. Anim Sci.
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J. Anim Sci. 1989. 67:1425-1431.
© 1989 American Society of Animal Science
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Genetic Correlations between Test Station and On-Farm Performance for Growth Rate and Backfat in Pigs1

T. A. Van Diepen2 and B. W. Kennedy

University of Guelph3, Guelph, Ontario, Canada N1G 2W1

Abstract

Record of performance data taken on Yorkshire pigs on-farm in 123 breeder herds and at a central test station were used to estimate genetic correlations between measures of backfat depth and days to 90 kg on boars at the test station and boars and gilts on-farm. The data involved records on 3,513 station-tested boars, 13,760 farm-tested boars and 28,203 farm-tested gilts from 838, 2,098 and 2,339 sires, respectively. For backfat depth, estimates of genetic correlations were .85 for test station and on-farm boars and 1.04 for test station boars and on-farm gilts. Estimates of genetic correlations between test station and on-farm measures of days to 90 kg were .80 for boars and .74 for boars and gilts. Based on these results, selection of boars on the basis of test station performance for backfat and growth rate would be expected to result in genetic improvement on-farm in both sexes under North American testing and management conditions.

Footnotes

1 Financial support was provided by the Ontario Ministry of Agric. and Food, the Natural Sci. and Eng. Res. Council of Canada and IBM Canada.

2 Present address: Dept. of Anim. Breed., Wageningen Agric. Univ., P.O. Box 338, 6700 AH Wageningen, The Netherlands.

3 Centre for Genetic Improvement of Livestock, Dept. of Anim. and Poult. Sci.






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Copyright © 1989 by the American Society of Animal Science.