Abstract

Abstract Based on the results of two experiments, constant delivery of gonadotropin releasing hormone (GnRH) via osmotic pumps to progestin-pretreated anovulatory mares elevated circulating concentrations of luteinizing hormone (LH) to levels observed in estrous mares. Furthermore, the episodic nature of LH concentrations were still detected for the six days that mares were continuously administered GnRH. However, there was an apparent 22% decrease in the frequency of LH peaks per hour while mean peak lengths were 27% longer for mares administered a constant delivery of GnRH than for untreated mares.

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