A. Sajjad, A., Mahmud, A. , Akram , M. , Khalique, A. , Hussnain, F. , S. Haidary, A., Khan, U. and Usman, M. 2013. Effect of dietary supplementation of different lutein sources on the productive performance of commercial layers categorized in three body weights. Scientific Journal of Zoology. 2, 6 (Jun. 2013), 64-73.