Summary. Fertility in young primiparous female bank voles was improved by daily injections after mating of progesterone (0·5 mg/day) or prolactin (8 i.u./day). Prolactin treatment increased the number of healthy corpora lutea. The results suggest that the sterile matings at the start of the breeding season are not due to failure of ovulation, but to lack of progesterone from inactive CL.
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