BHUYAN, M., DEKA, B. C., SARMAH, B. C., CHAKRAVARTY, P., GOSWAMI, J., & KHAN, M. H. (2013). Duration of oestrus, time of ovulation and progesterone profile in oestrus synchronized yak cows. The Indian Journal of Animal Sciences, 83(5). https://epubs.icar.org.in/index.php/IJAnS/article/view/29751