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Histological and morphometrical examinations were made to investigate the explants of yellow bodies in four gravid cows slaughtered the seventh day after PMSG superovulation and after artificial insemination. The medium of luteal tissue explants was added the test substance 15-glycal cloprostenol at doses of 2.5; 25 and 250 micrograms per ml of the medium. Parallelly cloprostenol in the Oestrophan inj. Spofa preparation was investigated at a dose of 25 micrograms per ml of the medium. The action of the medium lasted 24 hours at temperatures of 37 and 24 degrees C. Besides an overall histological examination the following morphometric indicators were studied: total counts of luteal cells per 1 mm2 area, average area of luteal cells and their nuclei and determination of the nucleocytoplasmic ratio of these cells, parenchymal area (area of luteal cells and stroma) of the luteal tissue per 1 mm2 area. The examinations have indicated that 15-glycal cloprostenol at a dose of 25 micrograms per ml of the medium has stimulating, luteotropic effects on the luteal tissue. The effects were manifested by luteal tissue hyperplasia and the largest area of luteal tissue parenchyma. On the other hand the effects of a tenfold higher dose (250 micrograms per ml of the medium) of the same substance were luteolytic similarly like those of parallelly tested cloprostenol.