@article{ahmad_mahmud_hussain_javed_2019,  title={Productive Performance, Egg Characteristics and Hatching Traits of Three Chicken Genotypes under Free-Range, Semi-Intensive, and Intensive Housing Systems},  volume={21},  ISSN={1516-635X},  url={https://doi.org/10.1590/1806-9061-2018-0935},  DOI={10.1590/1806-9061-2018-0935},  number={2},  journal={Brazilian Journal of Poultry Science},  publisher={Fundação de Apoio à Ciência e Tecnologia Animal},  author={Ahmad, S and Mahmud, A and Hussain, J and Javed, K},  year={2019},  pages={eRBCA-2018-0935} }