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OVULATION, CORPORA LUTEA DEVELOPMENT AND PITUITARY LH ACTIVITY IN RABBITS WITH INTRA-UTERINE DEVICES

Summary.: Sixty-eight oestrous New Zealand white rabbits were used in four experiments to study the pituitary LH content, ovulation time and corpus luteum development in the presence of intra-uterine devices (IUD) fitted in both horns. The results indicate that the IUD-fitted animals ovulate later and their pituitary LH content following mating is higher than in sham-operated controls. Also, such animals have lighter and less luteinized corpora lutea compared with their sham-operated controls at 24 hr after mating.