J. Anim Sci.
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J. Anim Sci. 1971. 33:64-71.
© 1971 American Society of Animal Science
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A Review: Relationships of Some Hormones to Growth and Carcass Quality of Ruminants1

H. D. Hafs2, R. W. Purchas3 and A. M. Pearson4

Michigan State University, East Lansing 48823

Abstract

ALTHOUGH estrogens are used commercially to enhance growth and increase protein deposition in ruminants, elongation of the epiphyseal cartilage is reduced by estrogens. In fact estrogens generally are not classified as anabolic hormones. The androgens are known as anabolic hormones in most animals, but growth and nitrogen balance studies with androgens have yielded disappointing results in ruminants.

Thus, the mode of action of gonadal steroids such as estrogens, is unknown. Understanding the relationship of steroidal hormones to carcass quality is even more tenuous because most published data describe carcass quality after administration of exogenous hormones. Effectiveness of exogenous hormone often is questionable in terms of mobilization, half-life, liver metabolism and unknown active forms of the hormone.

The object of this paper is to review the known actions of estrogens in causing growth in ruminants, and to condense some of our experience with relationships of endogenous hormones to growth and carcass quality in Holstein bulls and heifers.

Footnotes

1 Michigan Agricultural Experiment Station Journal Article No. 5254. This paper was presented as a part of the symposium, The Influence of Sex and Castration on Carcass Quality, Pennsylvania State University, 1970.

2 Animal Reproduction Laboratory, Dairy Department.

3 Present address: M. C. Franklin Laboratory, University of Sydney, Camden, N.S.W., Australia.

4 Department of Food Science.






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Copyright © 1971 by the American Society of Animal Science.