J. Anim Sci.
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J. Anim Sci. 1967. 26:274-277.
© 1967 American Society of Animal Science
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Selection Practiced and Phenotypic Change in a Closed Line of Beef Cattle1

G. E. Nelms and P. O. Stratton

University of Wyoming, Laramie

Abstract

The purpose of this study was to study the intensity of selection and phenotypic change in yearling weight in a small population of beef cattle. Selection intensity in this study was 0.19 standard deviations per year or 24.1 kg. per generation. The corresponding phenotypic change was 10.9 kg.

The secondary selection differential and actual change per generation for birth weight was 0.8 kg. and 1.2 kg.; for 180-day weight, 6.5 kg. and 3.0 kg.; and for average daily gain, 65.6 gm. and 50.6 gm.

Inbreeding of calf had a detrimental effect on 180-day weight (–.465 kg. for each increase of 1% inbreeding), while the other traits were not affected. Inbreeding of dam did not significantly affect any of the traits studied.

These data would indicate that positive phenotypic change can be achieved with selection in small populations. Correlated responses of birth weight, 180-day weight and average daily gain were achieved when selecting for yearling weight.

Footnotes

1 Published with approval of the Director, Wyoming Agricultural Experiment Station, as Journal Article No. 308.




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S. Mc Parland, J. F. Kearney, D. E. MacHugh, and D. P. Berry
Inbreeding effects on postweaning production traits, conformation, and calving performance in Irish beef cattle
J Anim Sci, December 1, 2008; 86(12): 3338 - 3347.
[Abstract] [Full Text] [PDF]


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Copyright © 1967 by the American Society of Animal Science.