El-Husseiny , O., Soliman, A. and Elsherif, H. (2018) “Influence of Dietary Methionine, Folic Acid and Cyanocobalamin and Their Interactions on the Performance of Broiler Breeder”, International Journal of Poultry Science, 17(4), pp. 189–196. doi:10.3923/ijps.2018.189.196.