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Biology of Reproduction, Vol 24, 795-800, Copyright © 1981 by Society for the Study of Reproduction

Neuroendocrine Regulation of Luteinizing Hormone Secretion in Beef Calves

L. L. ANDERSON 1, D. L. HARD 1, L. S. CARPENTER 1, E. K. AWOTWI 1, , and M. A. DIEKMAN 1

1 Department of Animal Science, Iowa State University, Ames, Iowa 50011


Hypothalamic regulation of luteinizing hormone (LH) secretion was investigated in 5-month-old beef calves by comparing the effects of hypophysial stalk transection and sham operation during prepuberal development. LH is released episodically in these sham-operated heifer calves. LH in peripheral blood serum reaches average peak concentrations of 4.4 ng/ml (range 1.6-12.6 ng/ml) within 20 min and requires about 80 min to return to average basal levels of 0.3 ng/ml (range 0.20-0.48 ng/ml). During an 8 h period the mean number of LH peaks is 3.4 (range 1-6) in control calves. After hypophysial stalk transection, a complete inhibition of the episodic release of LH occurs; peripheral serum LH remains consistently at basal or nondetectable (< 0.2 ng/ml) concentrations in these calves. These results indicate that episodic release of LH depends upon hypothalamic stimulation during prepuberal development in cattle.

Note:
ACKNOWLEDGMENTS We thank Dr. G. D. Niswender, Department of Physiology and Biophysics, Colorado State University, Fort Collins, for ovine LH antiserum; National Pituitary Agency, NIH, Baltimore, MD, for highly purified bovine LH; Dr. R. M. Melampy for advice; and M. E. Shell, C. R. Bohnker, and L. P. Kertiles for excellent technical assistance.

Submitted on October 29, 1980
Accepted on January 2, 1981




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Copyright © 1981 by the Society for the Study of Reproduction.