S. K. JACOB, P. T. PHILOMINA, and V. RAMNATH, “Influence of pregnancy and early lactation on the serum levels of iron, copper and, zinc in crossbred heifers*”, Indian J of Anim Sci, vol. 73, no. 1, Aug. 2014, Accessed: Oct. 23, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/42190