BONIA, k K, and J GOSWAMI. 2011. “Serum 17β- Oestradiol, Progesterone and Cortisol Level During Biological Stress Period of Normal and Sub-Oestrous Cycles of Crossbred Cattle of Asom”. The Indian Journal of Animal Sciences 81 (7). https://epubs.icar.org.in/index.php/IJAnS/article/view/7716.