@article{mattos_del lama_martinez_freitas_2004,  title={Association of bGH and Pit-1 gene variants with milk production traits in dairy Gyr bulls},  volume={39},  ISSN={0100-204X},  url={https://doi.org/10.1590/S0100-204X2004000200007},  DOI={10.1590/S0100-204X2004000200007},  number={2},  journal={Pesquisa Agropecuária Brasileira},  publisher={Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira},  author={Mattos, Keiko Kusamura de and Del Lama, Silvia Nassif and Martinez, Mario Luiz and Freitas, Ary Ferreira},  year={2004},  month={Feb},  pages={147–150} }