Sampaio, C.B. Detmann, E. Valente, T.N.P. Souza, M.A. de Valadares Filho, S. de C. Paulino, M.F. Evaluation of feca recovering and long term bias of internal and external markers in a digestion assay with cattle Subjects--Topical Terms: BOVINORAÇÃOMATÉRIA SECADIGESTÃO