@article{monteiro_bertol_kessler_2017,  title={Applying precision feeding to improve the nitrogen efficiency of swine production: a review of possible practices and obstacles},  volume={47},  ISSN={0103-8478},  url={https://doi.org/10.1590/0103-8478cr2160596},  DOI={10.1590/0103-8478cr2160596},  number={7},  journal={Ciência Rural},  publisher={Universidade Federal de Santa Maria},  author={Monteiro, Alessandra Nardina Trícia Rigo and Bertol, Teresinha Marisa and Kessler, Alexandre de Mello},  year={2017},  pages={e20160596} }