Costa, F. G. P., Oliveira, C., Goulart, C., Figueiredo, D., & Neto, R. (2008). Use of Exogenous Enzymes on Laying Hens Feeding During the Second Production Cycle. International Journal of Poultry Science, 7(4), 333–338. https://doi.org/10.3923/ijps.2008.333.338