SARMAH BK, DUTTA DJ, BISWAS RK, SARMAH BC. Serum progesterone and oestradiol–17ß concentration in oestrus-induced prepubertal heifers. Indian J of Anim Sci. 2011;78(7). Accessed October 23, 2025. https://epubs.icar.org.in/index.php/IJAnS/article/view/3263