1887

Abstract

Diarrhoea in newborn and weaned piglets is mainly caused by enterotoxigenic (ETEC) with fimbriae F4. To investigate the prevalence of resistance to three fimbrial strains, F4ab, F4ac and F4ad, among Chinese indigenous pigs and Western commercial pigs introduced into China, we determined the ETEC F4 adhesion phenotypes in 292 pure-bred piglets from three Western commercial breeds and 12 Chinese indigenous breeds, and a total of 1093 adult pigs in a White Duroc×Erhualian intercross, by an microscopic adhesion assay. All the Tibet and Lantang pigs and a majority of the Erhualian and Rongchang pigs were resistant (nonadherent) to ETEC F4 whereas all the Laiwu pigs and most of the Jiangquhai and Tongcheng pigs were susceptible (adhesive) to at least one of the F4 strains. Yushan Black pigs were uniformly resistant to F4ab, and Jinhua pigs were predominantly resistant to F4ac. Susceptible and resistant animals were observed in the other breeds, indicating that diarrhoea caused by ETEC F4 could be prevalent in these breeds. This study confirmed the existence of eight previously reported F4 adhesion patterns, and supported the assumption that the three F4 receptors are encoded by distinct loci. Expression of the weakly adherent phenotype was observed in six pure-bred piglets and 90 adult F/F animals, and the inheritance of this phenotype and its correlation with susceptibility to disease are still not known.

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2009-08-01
2024-03-29
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