BHUYAN M, DEKA BC, SARMAH BC, CHAKRAVARTY P, BORAH BKD. Effect of three concentrations of progesterone in the vaginal sponge for oestrus synchronization in yak. Indian J of Anim Sci. 2012;82(5). Accessed October 27, 2025. https://epubs.icar.org.in/index.php/IJAnS/article/view/17688