Effect of scrotal insulation on seminal fructose, peripheral plasma prolactin, and circulating steroids in rams

Abstract

Peripheral plasma prolactin and seminal fructose levels were compared in rams subjected to insulation of the scrotum. After 7 days of scrotal insulation, prolactin levels were elevated and were higher than control levels for the duration of the experiment (28 days). Seminal fructose levels increased after 14 days of scrotal insulation and also remained significantly greater than control levels until the end of the experiment. No changes were observed in plasma oestradiol and progesterone, whereas after 14 and 28 days of treatment, testosterone levels were depressed. It is suggested from these findings that prolactin may play a role in the regulation of accessory gland activity in the ram, although the proximate cause of high prolactin levels in treated animals is not clear.