J. Anim Sci.
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J. Anim Sci. 1971. 33:343-348.
© 1971 American Society of Animal Science
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Relationships between Cow Weights and Calf Weaning Weights in Angus, Charolais and Hereford Breeds1

J. J. Urick2, B. W. Knapp3, J. S. Brinks4, O. F. Pahnish2 and T. M. Riley2

U.S. Department of Agriculture and Montana Agricultural Experiment Station, Miles City 59301

Abstract

In recent years emphasis has been placed on selecting for increased rate of gain in beef cattle. If selection for rate of gain is effective, the mature weight of brood cows would be expected to increase due to the positive genetic association between rate of gain early in life and mature weight as discussed by Brinks et al. (1962). Answers are needed on how increased mature size influences overall efficiency of production because of the increase in maintenance cost associated with heavier mature cow weights. Ewing et al. (1968) reported that energy requirements of mature beef cows were influenced importantly by both weight and levels of milk production. Klosterman, Sanford and Parker (1968) reported that fatter cows tended to gain weight while thinner cows lost weight when the feed energy level was based on the metabolic weight.

The relationship of beef cow and calf weights has been investigated by several workers.

Footnotes

1 This study was conducted under Western Regional Research Project W-1, The Improvement of Beef Cattle Through the Application of Breeding Methods, at the U. S. Range Livestock Experiment Station. Miles City, Montana, in cooperation with the Montana Agricultural Experiment Station, Bozeman. Accepted as Montana Agricultural Experiment Station Journal Series Paper No. 212.

2 U. S. Range Livestock Experiment Station, Miles City, Montana.

3 Animal Science Research Division, A.R.S., U.S.D.A., Fort Collins, Colorado.

4 Colorado Agricultural Experiment Station, Fort Collins.






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Copyright © 1971 by the American Society of Animal Science.