C. VARGHESE and K. C. GEORGE, “A composite sow index and its effects due to sire, parity and season”, Indian J of Anim Sci, vol. 71, no. 9, Jan. 2014, Accessed: Oct. 19, 2025. [Online]. Available: https://epubs.icar.org.in/index.php/IJAnS/article/view/37001