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THE EFFECT OF PROGESTERONE IMPLANTS ON OVULATION AND PLASMA LEVELS OF LH, FSH AND PROGESTERONE IN ANOESTROUS EWES

Summary.: The effects of 100-mg progesterone implants in anoestrous ewes on plasma progesterone and gonadotrophin levels are described. Implant removal resulted in a surge of plasma gonadotrophins and ovulation, but there was no evidence of behavioural oestrus in 90% of the ewes. These results are discussed.