J. Anim Sci.
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J. Anim Sci. 1982. 55:48-59.
© 1982 American Society of Animal Science
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Effectiveness of One and Two-Stage Selection of Sires Based on Own Performance and Progeny Test for a Single Trait: Selection of Beef Sires for 365-Day Weight1,2,

Rafael Alenda3,4,, T. G. Martin and D. L. Harris5

Purdue University, West Lafayette, IN 47907

Abstract

Theoretical methods are presented for estimating annual genetic response to single-stage selection based on own performance and to two-stage selection based on own performance plus progeny test. These methods were applied to single-trait selection for 365-d wt in beef cattle under the assumptions that heritability equaled .37 and genetic standard deviation equaled 15 kg. When one criterion of selection (own performance) was applied, the negative effects of increased generation interval associated with selection of the top animals for second and third usage more than offset the positive effects of an increased selection differential of young bulls. When two criteria of selection were used (own performance plus progeny test), accuracy of selection was improved but the effect of accuracy was almost completely offset by increased generation interval. Maximal annual genetic progress was achieved by performance testing a larger number of young bulls, selecting a very small proportion of those bulls for inclusion in the breeding herd and mating each bull to a large number of cows through artificial insemination.

Footnotes

1 Journal Paper No. 8462 of the Purdue Agr. Exp. Sta., Dept. of Anim. Sci.

2 Research reported in this manuscript was completed as part of the Purdue Univ. contributing project to the NC-1 Regional Project, "Improvement of Beef Cattle Through Breeding Methods."

3 Partially supported by a fellowship from Instituto Nacional Investigaciones Agrarias of Spain and The World Bank.

4 Present address: INIA-CRIDA 01, Apartado 10, La Coruna, Spain.

5 USDA-SEA-AR, West Lafayette, IN 47907.






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Copyright © 1982 by the American Society of Animal Science.