Callejo Ramos Antonio, Luciana dos Santos Andrea, Nicodemus Martin Nuria, Jesus Villamide Diaz Maria, Gutiérrez del Álamo Ángela, Isidro Buxade Carbó Carlos, Borges Amorim Alessandro, Anton Dib Saleh Mayra, Effect of Digestible Threonine Level of Diet on Productive Performance, Commercial Egg Grading and Egg Quality of 55- to 61-Week-Old Laying Hens, Journal of Veterinary Healthcare, Volume 1, Issue 2, 2017, Pages 12-19, ISSN 2575-1212, https://doi.org/10.14302/issn.2575-1212.jvhc-17-1795. (https://openaccesspub.orgjvhc/article/624) Keywords: amino acid; egg quality; hatch; poultry; productivity