Srivastava, S K, P C Sanwal, Umashankar Umashankar, V P Varshney, and K L Sahni. 2012. “Pregnancy Rates in Bovines Based on Plasma Progesterone Concentration During AI under Farm and Village Conditions”. The Indian Journal of Animal Sciences 69 (6). https://epubs.icar.org.in/index.php/IJAnS/article/view/20597.