Abstract
Summary. When compared in ewes at three dose-rates horse anterior pituitary extract (hap) produced a different ovarian response to that of pregnant mare serum gonadotrophin (pmsg). Although there was no difference in number of ovulations, there was a greater number of persistent follicles after pmsg. Because persistent follicles are associated with a decreased percentage of fertilized ova, hap is more suited than pmsg to the production of large numbers of fertilized sheep ova.
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