Sánchez herrera, Isaías, Elizabeth Posadas Hernández, Ezequiel Sánchez Ramírez, Benjamín Fuente Martínez, José Luis Laparra Vega, and Ernesto Ávila González. 2013. “Effect of Sodium Butyrate on Productive Performance of Laying Hens in a Semi-Free Range System”. Veterinaria México OA 42 (3). https://veterinariamexico.fmvz.unam.mx/index.php/vet/article/view/289.