J. Anim Sci.
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J. Anim Sci. 1978. 47:1307-1313.
© 1978 American Society of Animal Science
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Effects of LH, FSH, Prolactin and PGF2{alpha} on Testicular Blood Flow and Testosterone Secretion in the Ram1

R. P. Amann2,3,, T. M. Nett3 and G. D. Niswender3

Colorado State University, Fort Collins, 80523

Abstract

Five unilaterally castrated rams had Doppler blood flow transducers fitted onto the testicular artery. All rams were injected with saline, LH, FSH, prolactin and prostaglandin (PG)F2{alpha} in an experiment with a Latin square design. On each test day, measurements of blood flow in the testicular artery and samples of jugular venous blood for hormone analyses were taken at 15-min intervals for 2 hr before and 4 hr after the first injection. No treatment affected blood flow in the testicular artery although blood levels of LH, testosterone, FSH and prolactin were greatly increased. Injection of PGF2{alpha} had a variable effect on LH release; if LH concentration increased, a release of testosterone was detected. Blood flow also was unaltered during spontaneous, episodic increases of serum testosterone concentration. Thus, we conclude that changes in production and secretion of testosterone following LH stimulation of Leydig cells are not associated with changes in total blood flow to the testis.

Rams were exposed to estrous ewes and flow in the testicular artery was monitored continuously. There was an increase in testicular blood flow associated with mounting, intromission or ejaculation.

Footnotes

1 Supported in part by Western Regional Project in Reproduction, the Colorado State University Experiment Station and the Pennsylvania Agricultural Experiment Station. Hormones were generously donated by Dr. L. E. Reichert, Jr., the N1AMDD Pituitary Hormone Distribution Program and The Upjohn Co. Approved for publication as paper No. 5477 in the journal series of the Pennsylvania Agricultural Experiment Station.

2 Present address: Dairy Breeding Research Center, The Pennsylvania State University, University Park, Pennsylvania 16802.

3 Department of Physiology and Biophysics.






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