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Views: (1034) Date: (20-01-09) Pages: () |
Abstract: Effect of sexual arousal on gonadotrophin-releas ing hormone, luteinizing hormone and follicle-stimulating hormone secretion in the stallion. Irvine CH, Alexander SL. Department of Animal and Veterinary Sciences, Lincoln University, Canterbury, New Zealand. In an experiment conducted late in the physiological breeding season, 5 stallions were fitted with indwelling pituitary venous cannulae that permitted unobtrusive collection of blood coming from the pituitary and the hypothalamo-hypophys eal portal vessels. The next day, blood samples were collected at 5 min intervals for several hours while the stallions were resting. Pulses of gonadotrophin-releas ing hormone (GnRH), follicle-stimulating hormone (FSH) and luteinizing hormone (LH) occurred approximately once per hour. After this, an oestrous mare was brought into contact with each stallion for 8-30 min. This exposure rapidly induced pulses of GnRH, FSH and LH secretion in all stallions, showing that sexual arousal stimulates the hormones of the reproductive axis. PMID: 1795257 [PubMed - indexed for MEDLINE]