P E Geytenbeek

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The relationship between pituitary responsiveness to exogenous LH-RH, return of oestradiol-17 beta-induced positive-feedback effect on LH release and the resumption of oestrous cycles were studied in Merino ewes lambing in the breeding season. The mean (+/- s.e.m.) increase in plasma LH 2 h after 50 micrograms LH-RH i.v. was reduced (P < 0.001) in ewes(More)
The administration of LH-RH in a pulsatile regimen (100 ng i.v./h for 48 h) to acyclic ewes 26-30 days post partum increased plasma LH concentrations, and both the frequency and amplitude of plasma LH pulses. In 12/14 ewes these increases were followed by plasma LH surges similar to the preovulatory surges observed in 10 control cyclic ewes. Subsequent(More)
Plasma LH surges, similar to preovulatory surges in cyclic ewes (N = 9), were induced in 11/15 acyclic ewes, 19-26 days post partum, treated with LH-RH (100 ng i.v. every 3 h for 24 h, every 2 h for 24 h, then every 1 h for 24 h) (Group PPrh ), and in 11/15 LH-RH-treated acyclic ewes pretreated with progesterone (s.c. implant for 11 days) (Group PPprh ).(More)
Plasma LH levels and the effects of ovariectomy and of chronic and acute administration of oestradiol-17 beta were compared in post-partum (anoestrous) and cyclic Merino ewes during the breeding season. Plasma LH and LH pulses were detected in more post-partum (anoestrous) than cyclic (dioestrous) ewes (10/10 and 4/10 respectively). The post-partum ewes had(More)
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