Hamid , I. I. Investigations into the Addition of Herbal Methionine (Phytonin) As Substitute of Synthetic Methionine in Poultry Feeds 2-Effect of Herbal Methionine (Phytonin) Supplementation on Performance and Carcass Characteristics of Broiler Chicks. Int. J. Poult. Sci. 2014, 13 (8), 484–488. https://doi.org/10.3923/ijps.2014.484.488.