Abstract
Two experiments were conducted to examine gonadal regulation of gonadotropin secretion in male and female neonatal piglets. In the first experiment, a single i.p. injection of charcoal-treated porcine follicular fluid (pFF) lowered ( P < 0.05) concentrations of plasma follicle-stimulating hormone (FSH) at 6 and 12 h after administration in 7-day-old intact male piglets, but failed to alter FSH in castrated male or intact female piglets. In the second experiment, administration of pFF twice daily from day 0 to 14 of life caused an increase in plasma FSH levels in intact males, but did not significantly alter FSH in females or in males castrated at birth. Plasma LH did not differ between male and female piglets, but FSH was significantly lower in males than in females. Castration of males at birth resulted in lower testosterone and estradiol-17β levels and resulted in a gradual increase in concentrations of FSH over the 14-day experimental period. Treatment of neonatal pigs with pFF altered concentrations of FSH in intact males, but not in intact females, indicating a divergence between the sexes in the postnatal control of FSH secretion.
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