Madeira, L.A. et al. 2015. Assessment of low amounts of meat and bone meal in the diet of laying hens by using stable isotopes. Semina: Ciências Agrárias. 36, 2 (abr. 2015), 1155–1168. DOI:https://doi.org/10.5433/1679-0359.2015v36n2p1155.