J. Anim Sci.
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J. Anim Sci. 1971. 32:191-210.
© 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 I. Preweaning 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

RESULTS from early studies of individual and family selection for litter size and growth rate within inbred lines of swine (Comstock and Winters, 1944; Laben and Whatley, 1947; Kottman, Lush and Hazel, 1948; Fine and Winters, 1952, 1953; Rempel and Winters, 1952) were far from encouraging when adjusted for accumulated effects of inbreeding (Dickerson, 1951). Also, lack of control populations made it impossible to separate genetic response from environmental trends. The apparent lack of response in spite of intensive selection and substantial estimates of heritability, especially for growth rate, suggested direct progeny test selection for increased heterosis (Comstock, Robinson and Harvey, 1949; Dickerson, 1952) in crosses of specific stocks as a possible method for obtaining further genetic improvement in performance of swine.

The objective of the experiment was to determine the effectiveness of selection based upon (1) both pure strain and crossbred progeny performance and that (2) based solely upon pure strain performance. Selection was based on both preweaning and post-weaning performance.

Footnotes

1 Accepted as Montana Agricultural Experiment Station Journal Series Paper No. 986.

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, Bozeman.

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.