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No presente trabalho, são apresentados dados sobre o diagnóstico de gestação realizado por ultra-sonografia em 45 rebanhos ovinos, durante seis períodos reprodutivos. Foram examinadas 27.089 ovelhas de rebanhos comerciais, acasaladas durante o outono. A porcentagem de prenhez(PP) variou de 77,3 a 89,9%, com uma PP média de 81,6%. Rebanhos de raças de carne (Hampshire Down, Suffolk e Texel) mostram em média a PP mais elevada que foi de 85,6%, seguidos de ovelhas cruzas, com PP de 82,9% e finalmente ovelhas de raças de lã (Merino Australiano, Corriedale e Ideal) com PP média de 80,8%. Prováveis causas de baixas PP observadas em alguns rebanhos são apresentadas e discutidas. In this paper, data from real-time ultrasound pregnancy diagnosis carried out in 45 sheep flock during six reproductive seasons are presented. A total of 27089 ewes from commercial flocks, mated during autumn, were scanned. The mean pregnancy percentage(PP) found was 81.6% showing a variation from 77.3 to 89.9%. Mutton breed flocks (Hampshire Down, Suffolk and Texel) showed the highest PP of 85.6%, followed by cross breeds, with a PP of 82.9%. The PP of wool breeds flocks (Australian Merino, Corriedale and Polwarth) was 80.8%. The causes of low PP founded on some flocks is presented and discussed

Prenhez em rebanhos ovinos do Rio Grande do Sul-Brasil