Sánchez Quinche, Angel Roberto, et al. “Effect of a Diet Free of Antibiotics, Coccidiostats and Synthetic Amino Acids in Cobb 500 Sexed Chickens”. Ciencia Y Agricultura, vol. 18, no. 3, Oct. 2021, pp. 63-77, doi:10.19053/01228420.v18.n3.2021.12744.