R. S. Malik, M. A. Razzaque, and N. M. Al-Khozam, “Accuracy of ultrasonic scanning for pregnancy diagnosis in ewes of five different breeds”, Indian J of Anim Sci, vol. 68, no. 4, Jun. 2012, Accessed: Oct. 24, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/20017