Beer M de, Coon C. The Effect of Different Feed Restriction Programs and Dietary L-Carnitine Supplementation on Hepatic Lipogenesis, Plasma Heterophil to Lymphocyte Ratio and Yolk IgY Content of Broiler Breeder Hens. Int. J. Poult. Sci. 2009;8(4):328–341. doi:10.3923/ijps.2009.328.341