Valenzuela-Jiménez N, Rodríguez-Hernández K, Hernández-Cerón J, Vera-Ávila H, Núñez-Hernández G, Villa-Godoy A. 16 HOURS PHOTOPERIOD IN HOLSTEIN HEIFERS IN THE SUBTROPICS: EFFECTS IN DEVELOPMENT AND AGE TO FIRST ESTRUS. Ecosist. Recur. Agropec. 2015;2(4):53-67. doi:10.19136/era.a2n4.717