M. Ashfaq, R. Kousar, M. S. A. Makhdum, and J. Nasir. "EMPIRICAL ANALYSIS OF LIVESTOCK PRODUCTIVITY THROUGH IMPROVED BREEDING IN PUNJAB, PAKISTAN." Journal of Animal and Plant Sciences, vol. 30, no. 6, 2020, pp. 1642-1652, doi:10.36899/JAPS.2020.6.0185.