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Plasma LH and testosterone levels did not differ significantly between high and low fertility rams before or after sexual stimulation (ejaculation or teasing). Repeated stimulation caused significant elevation of mean plasma LH and an almost significant rise in testosterone concentration. Plasma testosterone peaks followed those of LH after 30-60 min. A single sexual stimulation did not always cause an LH peak or increase the mean LH level.

Effects of sexual stimulation on plasma levels of LH and testosterone in rams from high- and low-fertility flocks