Use of Betaine and Glycine as Nutritional Supplements in Laying Hens’ Diets and their Effect on Production Performance. NTU Journal of Agriculture and Veterinary Science, [S. l.], v. 6, n. 1, 2026. DOI: 10.56286/NTU-JAVS.2026.6.1.63-73. Disponível em: https://journals.ntu.edu.iq/index.php/NTU-JAVS/article/view/1409.. Acesso em: 31 mar. 2026.