Dynamics of uterine glands was studied in ewes after oestrus synchronization. Full-value oestrus was obtained in the ewes under study after the introduction of polyurethane vaginal tampons impregnated with 20 mg Chlorsuperlutine Spofa. Endometrium biopsy was used to collect samples after laparotomy. The number of uterine glands showed a significant increase, especially after the application of PMSG; the percentual proportion of glandular tissue in endometrium tree increases. There is an insular-type extension of glands. After ovulation there appear broadly luminized glands with numerous extension reaching up to the cellular layer of endometrium.