Se realizaron dos experimentos para evaluar el efecto del amamantamiento y “efecto macho” en la ovulación en el periodo postparto (PP) en la oveja Pelibuey. En el experimento 1, a los 10 días postparto, dos tratamientos se asignaron al azar a las ovejas con sus crías: Amamantamiento continuo (AC) y amamantamiento controlado (Ac). En AC, las crías permanecieron todo el tiempo con ellas (24h d-1) y en Ac, crías permanecieron por dos periodo de 30 min d-1 (08:00 a 08:30 h y de 17:00 a 17:30 h). En el experimento 2, se hizo el mismo sistema de manejo de amamantamiento que en experimento 1, al azar se conformaron cuatro grupos; amamantamiento continuo (AC), amamantamiento continuo con “efecto macho” (AC+EM), amamantamiento controlado (Ac) y amamantamiento controlado con “efecto macho” (Ac+EM). En el día 24 PP se sincronizaron con CIDR por 9 días, al retiro del dispositivo se empezó el “efecto macho” (cada 6 h por 3 d). A partir del día 7 al 45 postparto, se tomaron muestras de sangre para determinar progesterona en plasma en ambos experimentos, así como el registro cada semana de peso corporal de ovejas y corderos desde el parto hasta el destete (60 d). En el experimento 1 se observó, que las ovejas con Ac ovularon 52.50 %, siendo diferente (p˂0.05) de las de AC. En el experimento 2, el porcentaje de ovejas que ovularon fue menor en AC (47.37 %; p˂0.05) comparado con AC+EM, Ac y Ac+EM (95, 85 y 95 %, respectivamente). Los cambios de peso corporal de ovejas y corderos no fueron diferentes (p>0.05) entre tratamientos; sin embargo, fue evidente la pérdida de peso en corderos con Ac+EM. Por lo anterior, se concluye que el amamantamiento controlado restablece la actividad ovárica en la oveja Pelibuey y el “efecto macho” induce y sincroniza la ovulación sin afectar el peso corporal de ovejas y corderos. _______________ “MALE EFFECT” ON POST-PARTUM OVULATION IN SUCKLING PELIBUEY EWES. ABSTRACT: Two experiments were carried out to evaluate the effect of suckling and “male effect” on ovulation in the post-partum period (PP) of Pelibuey ewes. In experiment 1, 10 days post-partum, two treatments were randomly assigned to ewes and their offspring: continuous suckling (AC) and controlled suckling (Ac). In AC, the lambs remained continuously with the ewes (24h d-1), while in Ac, the lambs were placed with the ewes for two 30 min d-1 periods (08:00 to 08:30 h and 17:00 to 17:30 h). In experiment 2, the same suckling treatments as in experiment 1 were used. Four groups were randomly formed: continuous suckling (AC), continuous suckling with “male effect” (AC+EM), controlled suckling (Ac), and controlled suckling with “male effect” (Ac+EM). On day 24 PP, the ewes were synchronized with CIDR for 9 days and the “male effect” was started after removing the device (every 6 h for 3 d). From day 7 to 45 PP, blood samples were taken to determine progesterone in plasma in both experiments. A weekly registry was kept of the weight of the ewes and lambs from birthing to weaning (60 d). In experiment 1, it was observed that the ewes under Ac ovulated 52.50%, being different from (p<0.05) those under AC. In experiment 2, the percentage of ovulating ewes was lower in AC (47.37%) as compared against AC+EM, Ac, and Ac+EM (95, 85, and 95 %, respectively). Changes in body weight of both ewes and lambs were not different (p>0.05) among treatments; however, there was an evident weight loss in lambs under Ac+EM. Because of this, it is concluded that controlled suckling reestablishes ovarian activity in Pelibuey ewes, while the “male effect” induces and synchronizes ovulation without affecting body weight of ewes and lambs.