J. Anim Sci.
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J. Anim Sci. 1971. 33:455-457.
© 1971 American Society of Animal Science
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Precalving Body Size and Pelvic Area Relationships in Hereford Heifers1

R. A. Bellows2, R. B. Gibson2, D. C. Anderson3 and R. E. Short2, 4,

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

Abstract

The relationships among area of the pelvic opening, hip width, rump length and body weight have been studied prior to calving in 3-year-old, primiparous Hereford heifers. Analyses indicated highly significant correlations among all measurements studied. Standard partial regression coefficients depicting effects of body weight, hip width and rump length on pelvic area were all highly significant. The effect of body weight was the most important followed by hip width and rump length. Findings suggest that larger skeletal size may be indicative of larger pelvic openings.

Footnotes

1 This study was conducted at the U. S. Range Livestock Experiment Station, Miles City, Montana 59301, as a contribution to Western Regional Research Project W-95, Endocrine Mechanisms Controlling Bovine Reproduction, in cooperation with the Montana Agricultural Experiment Station. Publication has been approved by the Director of the Montana Agricultural Experiment Station, Journal Series No. 217.

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

3 North Montana Branch Experiment Station, Havre, Montana.

4 Authors express appreciation to: L. L. Nunn and H. E. Traweek for assistance in data collection and care of animals during the study and to B. W. Knapp, A.R.S., Fort Collins, Colorado, for assistance in data analyses.






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Copyright © 1971 by the American Society of Animal Science.