M. de Beer and C. Coon, “The Effect of Different Feed Restriction Programs and Dietary L-Carnitine Supplementation on Reproductive Performance, Efficiency, Frame Size and Uniformity in Broiler Breeder Hens”, Int. J. Poult. Sci., vol. 8, no. 5, pp. 409–425, Apr. 2009, doi: 10.3923/ijps.2009.409.425.