Desempenho reprodutivo de fêmeas suínas submetidas à inseminação artificial intra-uterina ou à tradicional

Abstract

Desempenho reprodutivo de fêmeas suínas submetidas à inseminação artificial intra-uterina ou à tradicional.Ciência Rural, v.37, n.6, nov-dez, 2007. Ciência Rural, Santa Maria, v.35, n.6, p.1735-1739, nov-dez, 2005 ISSN 0103-8478 RESUMO

New Artificial Insemination Technologies for Swine

“…Although PCAI is currently used in several countries, the number of sperm cells per dose is not yet standardized. Sows inseminated with PCAI have similar pregnancy and farrowing rates to those with CAI even when the number of sperm cells is reduced to 1.5 (Dallanora et al 2004a), 1.0 (Watson and Behan 2002) or 0.5 billion (Bennemann et al 2007). In some cases, sows submitted to PCAI can even have significantly higher fertility results than those inseminated by CAI, with twofold higher sperm cells number (Hern andez-Caravaca et al 2012).…”

“…), 1.0 (Watson and Behan ) or 0.5 billion (Bennemann et al. ). In some cases, sows submitted to PCAI can even have significantly higher fertility results than those inseminated by CAI, with twofold higher sperm cells number (Hernández‐Caravaca et al.…”

“…However, litter size decreased by 0.8 piglets with 0.5 billion sperm cells (Bennemann et al. ), and a reduction of viable embryos (Mezalira et al. ) and foetuses (Wolken et al.…”

“…) or in the vaginal vestibule (Bennemann et al. ) within 120 minutes after insemination. Also, the presence of blood during insemination is more frequent in primiparous than in multiparous sows, which was noticed in 23% of first‐parity sows, probably due to their smaller reproductive tract (Sbardella et al.…”

“…In some cases, sows submitted to PCAI can even have significantly higher fertility results than those inseminated by CAI, with twofold higher sperm cells number (Hern andez-Caravaca et al 2012). However, litter size decreased by 0.8 piglets with 0.5 billion sperm cells (Bennemann et al 2007), and a reduction of viable embryos (Mezalira et al 2005) and foetuses (Wolken et al 2002) was observed with 0.25 and 0.1 billion sperm cells, respectively. These findings suggest that there is a limit to the reduction of sperm cell number in the PCAI technique, which is probably below the 1-1.5 billion that is commonly used.…”