BHUYAN, M, B C DEKA, B C SARMAH, P CHAKRAVARTY, and K AHMED. 2013. “Signs of Oestrus After Synchronization of Oestrus in Yak Using Progesterone Impregnated Vaginal Sponge”. The Indian Journal of Animal Sciences 83 (1). https://epubs.icar.org.in/index.php/IJAnS/article/view/26435.