J. Anim Sci.
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J. Anim Sci. 1963. 22:346-353.
© 1963 American Society of Animal Science
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Estimates of Phenotypic and Genetic Parameters in Ten Years of Miles City R.O.P. Steer Data1

C. E. Shelby2, W. R. Harvey3, R. T. Clark4, J. R. Quesenberry5 and R. R. Woodward6

United States Department of Agriculture and Montana Agricultural Experiment Station

Abstract

The phenotypic and genetic relationships existing between and within various traits thought to be of economic importance in beef cattle were investigated in a 10-year block (1947–1956) of data collected at the U. S. Range Livestock Experiment Station at Miles City, Montana, in Record of Performance tests. Records of 616 steers from grade cows mated to 87 bulls representing 11 lines of breeding were used. Genetic, phenotypic and environmental correlations and heritabilities were estimated for 18 traits. Mass selection for A.D.G. or final weight would be moderately effective. Sib or progeny test were indicated for most carcass traits. Little correlated response in desired carcass traits would result from selection for preslaughter traits except for length of body and leg.

Footnotes

1 This study was conducted in cooperation with the Western Regional Project, W-1, The Improvement of Beef Cattle Through the Application of Breeding Methods.

2 Present Address, Swine Research Branch, Animal Husbandry Research Division, ARS, Regional Swine Breeding Laboratory, Ames, Iowa. Formerly, Geneticist, Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, Denver, Colo.

3 Biometrician in charge, Livestock Research Staff, Biometrical Services, ARS. Beltsville, Md.

4 Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, Denver, Colo.

5 Beef Cattle Research Branch, Animal Husbandry Research Division, ARS, U. S. Range Livestock Experiment Station, Miles City, Mont.

6 Present Address, Beef Advisor, American Breeders Service, Miles City, Mont. Formerly, Animal Husbandman, U. S. Range Livestock Experiment Station, Miles City, Mont.






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Copyright © 1963 by the American Society of Animal Science.