@article{oliveira_campos_lana_detmann_valadares filho_2010,  title={Estimate of the optimal level of concentrates for dairy cows on tropical pastures by using the concept of marginal analysis},  volume={39},  ISSN={1516-3598},  url={https://doi.org/10.1590/S1516-35982010000900024},  DOI={10.1590/S1516-35982010000900024},  number={9},  journal={Revista Brasileira de Zootecnia},  publisher={Sociedade Brasileira de Zootecnia},  author={Oliveira, André Soares de and Campos, José Maurício de Souza and Lana, Rogério de Paula and Detmann, Edenio and Valadares Filho, Sebastião de Campos},  year={2010},  month={Sep},  pages={2040–2047} }