M. R. Kumar, D. P. Tiwari, A. Kumar, and N. Gupta, “Effect of undegradable dietary protein level and plane of nutrition on milk yield and serum biochemical constituents in crossbred cattle”, Indian J of Anim Sci, vol. 76, no. 9, Mar. 2011, Accessed: Oct. 23, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/4355