J. Anim Sci.
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J. Anim Sci. 1971. 32:211-224.
© 1971 American Society of Animal Science
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Effectiveness of Reciprocal Selection for Performance of Crosses between Montana No. 1 and Yorkshire Swine.1 II. Postweaning Traits

E. V. Krehbiel2, H. O. Hetzer3, A. E. Flower4, G. E. Dickerson5, W. R. Harvey6 and L. A. Swiger7

U. S. Department of Agriculture, Montana State University, Miles City 59301 and Ohio State University, Columbus 43210

Abstract

THE general plan of an experiment designed to determine effectiveness of selection for sow-productivity and rate of postweaning growth in Montana No. 1 x Yorkshire and reciprocal crossbred litters has been presented (Krehbiel et al., 1971), with results for preweaning traits. Deliberate selection for litter size and weight in parental lines was based on both the dam's litter and progeny test in crossbred matings. Annual genetic improvement in size and weight of crossbred litters at weaning was substantial (about .2 pigs and 5 kg, respectively), while performance of parental lines declined (–.1 pigs and –2.7 kg) even after adjustment for inbreeding depression.

This second paper presents selection differentials and estimates of genetic change for postweaning gain and for the index combining sow productivity and postweaning gain. A separate report will compare realized genetic changes in both pre- and postweaning performance with those predicted from the selection applied and the estimates of genetic and phenotypic parameters.

Footnotes

1 Accepted as Montana Agricultural Experiment Station Journal series Paper No. 989.

2 Area Extension Center, Wapakoneta, Ohio.

3 A.S.R.D., A.R.S., U.S.D.A., Beltsville, Maryland.

4 Animal and Range Science Department, Montana State University, Boseman.

5 U.S.M.A.R.C., A.S.R.D., A.R.S., U.S.D.A., Lincoln, Nebraska.

6 Dairy Science Department. Ohio State University, Columbus.

7 Animal Science Department. Ohio State University, Columbus.






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Copyright © 1971 by the American Society of Animal Science.