HAMID , Ibrahim I. Investigations into the Addition of Herbal Methionine (Phytonin) As a Substitute of Synthetic Methionine in Poultry Feeds 1-Effect of Herbal Methionine (Phytonin) Supplementation on Performance and Egg Quality of Laying Hens. International Journal of Poultry Science, Pakistan, v. 13, n. 8, p. 480–483, 2014. DOI: 10.3923/ijps.2014.480.483. Disponível em: https://ijpsjournal.org/index.php/ijps/article/view/2082. Acesso em: 22 sep. 2025.