Performance reprodutiva de leitoas submetidas à inseminação artificial pós-cervical

Inglés. ABSTRACT The objective of this study was to evaluate the reproductive performance of gilts subjected to post-cervical artificial insemination (PCAI) compared to traditional artificial insemination (TAI). We also evaluated the degree of difficulty in bypassing the cervix, time required to perform the insemination, presence of bleeding after insemination, semen backflow, as well as the volume and the total reflow cells 30 minutes after insemination. Gilts submitted to PCAI (n = 279) were inseminated with 45 mL doses of 1.5 x 10⁹ sperm cells and the ones submitted to TAI (n = 273) were inseminated with 80 mL doses with 2.5 x 10⁹ cells. The bypassing of the cervix was possible in 91.04% (254/279) of gilts. The difficulty bypassing the cervix in at least one of the gilt’s PCAI procedures happened with 41.58% (116/279) of the females, but it did not affect reproductive performance (P>0.05). The presence of bleeding after insemination did not affect the farrowing rate and total number of piglets born for both treatments (P>0.05). The average time needed to carry out the PCAI was 1.47 minutes and the TAI was 4.04 minutes. The percentage of sperm present in the reflux was higher in TAI than the PCAI, but no correlation was found between litter size and the percentage of sperm in reflux (P>0.05) and the total number of piglets born (11.63 and 11.81) between TAI and PCAI treatments, respectively. Thus, it is possible to perform the post-cervical artificial insemination in gilts without causing a reduction in reproductive performance, using doses with a concentration of 1.5 x 10⁹ sperm cells.

Portugués. RESUMO O objetivo deste trabalho foi avaliar o desempenho reprodutivo de nulíparas submetidas à inseminação artificial pós-cervical (IAPC) comparada à inseminação artificial tradicional (IAT). Foram avaliados ocorrência de sangramento, ocorrência de refluxo, dificuldade no transpasse da cérvix e total de células refluídas até 30 minutos após inseminação. Fêmeas submetidas à IAPC (n=279) foram inseminadas com doses de 1,5 x 109 diluídas em 45mL, e fêmeas submetidas à IAT (n=273) inseminadas com doses de 2,5 x 109 em 80mL. O transpasse da cérvix foi possível em 91,04% (254/279) das leitoas. A dificuldade no transpasse foi de 41,58% (116/279), não comprometendo o desempenho reprodutivo (P>0,05). Presença de sangramento não afetou a taxa de parto nem o número de leitões nascidos para ambos os tratamentos (P>0,05). O percentual de espermatozoides presentes no refluxo foi maior na IAT, não sendo observada diferença no tamanho de leitegada de acordo com o percentual de espermatozoides no refluxo (P>0,05) e no número de leitões nascidos totais (11,63 e 11,81) entre os tratamentos IAT e IAPC, respectivamente. Pode-se realizar IAPC em leitoas sem causar redução no desempenho, utilizando-se doses com 1,5 x 109 células espermáticas.