Hamid II. 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. doi:10.3923/ijps.2014.484.488