Narvaez-Solarte W, Rostagno HS, Soares PR, Silva MA, Uribe-Velasquez LF. Nutritional Requirements in Methionine + Cystine for White-Egg Laying Hens During the First Cycle of Production. Int. J. Poult. Sci. 2005;4(12):965–968. doi:10.3923/ijps.2005.965.968