The present study was carried out to evaluate the pregnancy rate of Black Belly ewes reared under the conditions of the Peruvian coast, that were laparoscopic intrauterine inseminated with frozen-thawed pellet semen. Females were divided according to age and reproductive history in nulliparous (n = 21) and ewes (n = 17). Estrous synchronization was done using vaginal sponges (60 mg medroxyprogesterone acetate) for 13 days and the injection of 300 IU equine chorionic gonadotrophin upon sponge removal. The intrauterine insemination was conducted at fixed time (62-65 h post withdrawal of vaginal sponge) using a semen dose (0.4 ml, 40 x 10 6 spermatozoa) into the lumen of each uterine horn. Sedatives or tranquilizers were not used. Ultrasound pregnancy diagnosis was performed at day 35 after insemination. No significant differences were found in pregnancy rates between nulliparous (71.4%) and ewes (64.7%). The high pregnancy rates when using laparoscopic intrauterine insemination with frozen-thawed semen in Black Belly females supports the use of this technique for breeding elite animals. Key words: synchronization, insemination, laparoscopic, sheep RESUMENEl estudio tuvo por objetivo evaluar la tasa de preñez de ovejas Black Belly criadas de forma estabulada en la costa peruana y que fueron inseminadas intrauterinamente vía laparoscópica con semen congelado. Los animales fueron divididos de acuerdo a su edad e historia reproductiva en borreguillas (n = 21) y ovejas (n = 17). La sincronización del estro se realizó con esponjas intravaginales (60 mg de acetato de medroxiprogesterona) por 13 días y la aplicación de 300 UI de gonadotropina coriónica equina al retiro de las esponjas. La inseminación se realizó a tiempo fijo (62-65 h del retiro de la esponja intravaginal) usando un pellet de semen congelado (0.4 ml con 40 x 10 6 espermatozoides) en el lumen de cada cuerno uterino. No se utilizaron sedantes ni tranquilizantes. El diagnóstico de preñez por ecografía transrectal se hizo 35 días después de la inseminación artificial. No se encontraron diferencias significativas en la tasa de preñez a los 35 días
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