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GONADOTROPHIN CONTENT OF THE PITUITARIES OF SHEEP OF DIFFERING FERTILITY AT THREE STAGES OF THE OESTROUS CYCLE

Summary.: The pituitaries of Merino x Blackface ewes were found to contain more LH at mid-cycle (Day 10) than Finn x Blackface ewes. The content in purebred Blackface ewes was intermediate. No differences were observed in the relative activities of FSH or LH in the pituitaries of the three breed types around the time of oestrus, or of FSH on Day 10 of the cycle. It is postulated that more LH may be released during mid-cycle by the more highly fertile breed type.