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  • Title: Effect of sexual arousal on gonadotrophin-releasing hormone, luteinizing hormone and follicle-stimulating hormone secretion in the stallion.
    Author: Irvine CH, Alexander SL.
    Journal: J Reprod Fertil Suppl; 1991; 44():135-43. PubMed ID: 1795257.
    Abstract:
    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-hypophyseal portal vessels. The next day, blood samples were collected at 5 min intervals for several hours while the stallions were resting. Pulses of gonadotrophin-releasing 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.
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