J. Anim Sci.
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J. Anim Sci. 1971. 32:73-77.
© 1971 American Society of Animal Science
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Endocrine Changes in the Bovine during the Postpartum Period1

W. Darrell Foote2

University of Nevada, Reno 89507

Abstract

TWO questions often asked of and by researchers working with cattle are: (1) What is the endocrine picture in the postpartum cow and (2) How can it be modified to improve efficiency in calf production. Partial answers are now available to both of these questions. However, our present knowledge of the functions and relationships of the various glands and tissues involved in the reproductive processes is not sufficient to manipulate these phenomena to any great extent beyond limited experimental conditions.

Endogeneous Endocrine Changes and Relationships. Labhsetwar et al. (1964), Saiduddin (1964) and Saiduddin et al., (1968) have observed that pituitary luteinizing hormone (LH) activity was relatively low during early postpartum anestrus and increased as this interval progressed. Pituitary follicle stimulating hormone (FSH) concentrations tended to follow a trend inverse to that of LH. These results may be interpreted as a pituitary accumulation of LH preparatory for release for ovulation and a continual, more gradual release of FSH to stimulate ovarian follicular development in preparation for ovulation.

Footnotes

1 Division of Animal Science, Nevada Agricultural Experiment Station Journal Series No. 135. In cooperation with Regional Research Project W-95.

2 The author acknowledges the aid of the following former graduate students and other colleagues in the collection and analysis of data contained in this paper: M. M. Quevedo, S. Saiduddin, D. S. Sawhney, M. Gottschalk, D. W. Peterson, R. Crook, L. Walker, J. G. Brown, J. E Hunter, D. W. Marble, A. F. Parlow, V. L. Estergreen, G. D. Niswender and W. C. Foote.






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Copyright © 1971 by the American Society of Animal Science.