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Espinoza–Villavicencio, J.L., Palacios–Espinosa, A., Murillo–Amador, B. and Ortega–Pérez, R. 2024. The uterine diameter and ovarian activity influence the presence of estrus and pregnancy in beef heifers under a J–Synch protocol for fixed–time artificial insemination. Revista Científica de la Facultad de Ciencias Veterinarias. 34, 2 (Jun. 2024), 7. DOI:https://doi.org/10.52973/rcfcv-e34360.