SINGH, JAGIR, S P S GHUMAN, M HONPARKHE, and D DADARWAL. “Risk Factors for Prolonged Estrus in Crossbred Dairy Cattle”. The Indian Journal of Animal Sciences 82, no. 1 (January 2, 2012). Accessed October 29, 2025. https://epubs.icar.org.in/index.php/IJAnS/article/view/13828.