Effect of sexual arousal on gonadotrophin-releasing hormone, luteinizing hormone and follicle-stimulating hormone secretion in the stallion
Irvine, C.H.; Alexander, S.L.
Journal of Reproduction and Fertility. Supplement 44: 135-143
1991
ISSN/ISBN: 0449-3087 PMID: 1795257 Document Number: 375444
In an experiment in the physiological breeding season, 5 stallions were fitted with indwelling pituitary venous cannulae that permitted unobtrusive collection of blood from the pituitary and the hypothalamo-hypophyseal portal vessels. The next day, blood samples were collected at 5-min intervals for several hours while the stallions were resting; pulses of GnRH, FSH and LH occurred approx. once per h. On the same day, an oestrous mare was brought into contact with each stallion for 8-30 min. One to three pulses of GnRH, FSH and LH occurred in all stallions during contact with the oestrous mare.