V. MAHAJAN, S. N. S. PARMAR, M. S. THAKUR, G. SHARMA, V. VAISHALI, and M. PATEL, “Prolactin gene polymorphism and its association with milk production in Malvi, Nimari and Frieswal cattle”, Indian J of Anim Sci, vol. 82, no. 4, Apr. 2012, doi: 10.56093/ijans.v82i4.16689.