O presente experimento teve por finalidade verificar o efeito na prenhez de diferentes técnicas de inseminação cervical com sêmen congelado, em 234 ovelhas Corriedale, em cio natural. Utilizou-se sêmen congelado em peletes de três carneiros Suffolk e um Corriedale. Cento e trinta e seis ovelhas foram inseminadas por via cervical, com (60) e sem (76) tração cervical. Como grupo controle, noventa e oito ovelhas foram submetidas à inseminação laparoscópica. Para a análise do índice de prenhez, verificado através da ecografia, os graus de penetração foram classificados em cervical superficial e profundo. Considerando-se todas as ovelhas submetidas à inseminação cervical, obteve-se resultados de prenhez de 44,19% e 32,26%, respectivamente para maior e menor profundidade de deposição. A inseminação cervical sem tração resultou em 28,95% de prenhez, o que é estatisticamente inferior aos resultados observados por laparoscopia (57,14%; p < 0,001) e similares aos obtidos com tração cervical (45,00%). No entanto, a percentagem de prenhez foi semelhante entre a inseminação por tração cervical e laparoscópica. Os resultados são indicativos de que a inseminação com tração cervical proporciona resultados de prenhez análogos aos obtidos com a laparoscopia.

The present study aimed to verify the effect of different cervical insemination techniques with frozen semen on pregnancy of 234 Corriedale ewes, in natural estrus. Frozen semen in pellets from three Suffolk and one Corriedale ram were used in this experiment. One hundred and thirty-six ewes were inseminated through the cervix, with (60) and without (76) cervical traction. As the control group, ninety-eight ewes were submitted to laparoscopic insemination. Pregnancy rate was verified by ultrasound, the data were divided in superficial and deep penetration based in the degree that the catheter passed through the cervix. Considering the total number of ewes submitted to cervical insemination, the pregnancy rate was 44.19% and 32.26% for deep and superficial cervical deposition of the semen, respectively. The cervical insemination without traction resulted in 28.95% of pregnancy, which is statistically lower to that observed by laparoscopic insemination (57.14%; p < 0.001) and similar to the results obtained with cervical traction (45.00%). However, the percentage of pregnancy was similar between the insemination by cervical traction and laparoscopy. In conclusion, the results suggest that pregnancy rate of ewes, in natural estrus, is similar when either cervical traction or laparoscopy is used to inseminate with frozen semen.