Reproductive endocrine effects of intranasal administration of norethisterone to adult female rhesus monkeys (Macaca mulatta)

in Reproduction
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V. Puri
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G. F. X. David
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A. K. Dubey
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C. P. Puri
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T. C. Anand Kumar
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Summary. Intranasal administration of norethisterone at a daily dose of 9 μg between Days 5 and 14 of the menstrual cycles blocked ovulation in 10 out of 17 adult female monkeys. Serum concentrations of hormones indicated that ovulation was blocked due to a suppression of the mid-cycle, oestradiol-induced LH surge. Ovarian follicular activity in the treated menstrual cycles was not affected by norethisterone but there was a marked delay in the onset of the mid-cycle oestradiol surge in most of the treated animals. The duration of the menstrual cycle length after the oestradiol peak was significantly reduced in all the treated monkeys, indicative of a shortened luteal phase.

 

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