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A herd of sheep (40 heads) was divided into two equal groups: group 1 waskept under an overhead shelter and group 2 in a warm barn. The effect ofmaintenance on ewe's reproductive performance, corpora lutea and corpora lutea of pregnancyrate, as well as the concentration of plasma progesterone and estradiol inperipheral blood was investigated. At the first laparoscopy fewer corpora lutea thanduring the following one were observed (P ≤ 0.01). In sheep kept underthe overhead shelter, a greater number of corpora lutea were noted. More corpora lutea of pregnancy were observedin group 1 than in the group from the barn. On the first day after matingthe average level of progesterone was 190 pg mL−1, and after 2 weeks itincreased to more than 300 pg mL−1 (P ≤ 0.01). The positive correlationbetween the number of corpora lutea of pregnancy and progesterone concentration (P ≤ 0.01) andthe negative correlation (P ≤ 0.01) with number of corpora lutea of pregnancy, as well as betweenthe litter size and estradiol concentration, were observed. Harshenvironmental conditions did not cause a significant decrease of thereproduction performance of ewes kept under the overhead shed

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The ovulation rate, plasma progesterone and estradiol concentration, and litter size of a local ewe breed kept in a barn vs. those kept under an overhead shelter