Jawad Khadim, Jawad. “The Causes of Oestrus Occurance During Pregnancy in Cows”. University of Thi-Qar Journal of agricultural research 14, no. 1 (June 1, 2025): 105–107. Accessed August 5, 2025. http://mail.jam.utq.edu.iq/index.php/main/article/view/499.