Van Hieu, Truong, Qui Nguyen Hoang, and Nguyen Thi Kim Quyen. 2022. “Mitigating Feather Pecking Behavior in Laying Poultry Production through Tryptophan Supplementation”. Journal of Animal Behaviour and Biometeorology 10 (2):2211. https://doi.org/10.31893/jabb.22011.