CHANDRA P, LAKHCHAURA BD, SUD SC, ATHEYA UK, GARG GK. Effect of GnRH alone or in combination with estrogen on the ovarian activity of postpartum anestrous cows. Indian J of Anim Sci. 2013;65(11). Accessed October 24, 2025. https://epubs.icar.org.in/index.php/IJAnS/article/view/33887