Sorathiya, L. M., V. B. Kharadi, A. P. Raval, K. H. Sadharakiya, K. K. Tyagi, and M. A. Katariya. 2019. “Parametric Estimation of Factors Associated With Prediction of Calving in Surti Buffaloes Using Ordinal Regression”. International Journal of Livestock Research 9 (1). India:231-37. http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1415.