S. A. L. MONOWAR and C. SINGH, “Blood urea concentration in crossbred (Friesian x Hariana) heifers and lactating cows”, Indian J of Anim Sci, vol. 74, no. 4, Mar. 2014, Accessed: Oct. 23, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/38469