Ijabo, HM, JW Jatfa, EO Oyedipe, EK Bawa, and PM Dawuda. 2015. “Serum Progesterone Profiles During the Estrous Cycle, Pregnancy and Postpartum Periods in Yankasa Ewes”. Nigerian Veterinary Journal 35 (1):921-27. https://doi.org/10.4314/nvj.v35i1.