Kumar, Sumit, Deepak Sharma, Satyendra Pal Singh, Madhu Tiwari, and Rakesh Goel. 2018. “Study of Genetic Polymorphism in Leptin Exon 3 Region and Its Association With Milk Production and Reproduction Traits in Indian Sahiwal Cattle”. International Journal of Livestock Research 8 (8). India:84-91. http://ijlr.org/ojs_journal/index.php/ijlr/article/view/1637.