Sánchez Dávila, F., Martínez_Zuazua, V.A., Ledezma-Torres, R.A., Mauleón-Tolentino, K., Zapata-Campos, C.C., Luna-Palomera, C. y Garza-Brenner, E. 2023. Use of equine chorionic gonadotropin (eCG) in Mashona heifers, under a J-Synch synchronization protocol, and its effect in pregnancy rate: Use of equine chorionic gonadotropin in a J-Synch protocol in heifers. Agro Productividad. (may 2023). DOI:https://doi.org/10.32854/agrop.v16i3.2387.