Salazar-Carranza, M., Castillo-Badilla, G., Murillo-Herrera, J., Hueckmann-Voss, F., & Romero-Zuñiga, J. J. (2013). Age at first calving in Holstein dairy cows specialized in Costa Rica. Agronomía Mesoamericana, 24(2), 233–243. https://doi.org/10.15517/am.v24i2.12522