Summary. Female voles were subjected to various regimens of subcutaneous injections of oestradiol-17β, oestradiol benzoate and/or progesterone. Ovulation occurred in only a few of the mature females and in none of the immature animals. There was no indication of any increased LH levels in blood samples taken every 2 h for 50 h after 150 μg oestradiol-17β.
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