Reklewska, B., Z. J. Tyszka, and R. Niznikowski. “Plasma Progesterone Concentration During Oestrus Cycle and Pregnancy in Finnsheep and Other Prolific Sheep Breeds”. Agricultural and Food Science 60, no. 6 (October 1, 1988): 554–556. Accessed November 23, 2024. https://journal.fi/afs/article/view/72310.