Atsuko, Ikeda, Yoichiro Hayashi, Juan Antonio Pereira, and Pablo Roberto Marini. 2020. “Age at First Calving and Its Relationship With Efficiency Indicators in Nelore Cows in a Grazing System in the Bolivian Tropics”. European Journal of Applied Sciences 8 (4), 85-91. https://doi.org/10.14738/aivp.84.8865.