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首页> 外文期刊>World's Poultry Science journal >Sub-clinical necrotic enteritis: its aetiology and predisposing factors in commercial broiler production
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Sub-clinical necrotic enteritis: its aetiology and predisposing factors in commercial broiler production

机译：亚临床坏死性肠炎：其病因和商业肉鸡生产中的诱发因素

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Sub-clinical necrotic enteritis (NE) is a major economic cost to the broiler production industry due to poor growth and feed conversion efficiency of broiler chicken flocks, higher condemnation of livers or rarely the whole carcasses at the slaughter house and an increased risk of microbial contamination of poultry meat. Sub-clinical NE is a multifactorial disease although Clostridium perfringens plays a major role in its pathogenesis. Its diagnosis and confirmation are quite different from those of general infectious diseases. Disease confirmation is from the presence of necrotic or ulcerative lesions on the small intestinal mucosa with identifiable aggregates of pathogenic C. perfringens. C. perfringens numbers in the small intestinal digesta or the mucosal scrapings are not correlated with disease severity, whereas counts above 10(6) cfu/g in the caecal contents indicate an increased probability of NE-specific gut lesions. Not only does the presence and counts of C. perfringens strains capable of producing related toxins affect the incidence of the disease but also a number of predisposing factors are important in the aetiology of NE. The major factors that predispose growing chickens to subclinical NE are diet variables, diseases that cause mucosal damage of the intestine and environmental factors that either alter the development of gut associated lymphoid tissue or change litter quality within the production house. Dietary variables may be a major cause of variation in sub-clinical NE in commercial broiler production; differences in polysaccharides, lipids, protein sources, protein digestibility and the presence of antinutritive factors have been identified as variables affecting the incidence of the disease.
机译：亚临床坏死性肠炎（NE）是肉鸡生产行业的主要经济成本，原因是肉鸡群的生长和饲料转化效率差，肝脏的定罪率更高或屠宰场的整个屠体很少，并且微生物风险增加家禽肉的污染。亚临床NE是多因素疾病，尽管产气荚膜梭状芽胞杆菌在其发病机理中起着重要作用。它的诊断和确认与普通传染病完全不同。疾病确认是由于小肠粘膜上存在坏死性或溃疡性病变，伴有病原性产气荚膜梭菌的聚集体。小肠消化道或粘膜刮屑中的产气荚膜梭菌数量与疾病严重程度无关，而盲肠内容物中计数高于10（6）cfu / g则表明NE特异性肠道损伤的可能性增加。能够产生相关毒素的产气荚膜梭菌菌株的存在和数量不仅会影响疾病的发病率，而且许多诱发因素在NE的病因学中也很重要。使成年鸡易患亚临床NE的主要因素是饮食变量，引起肠道粘膜损伤的疾病以及环境因素，这些因素会改变肠道相关淋巴组织的发育或改变生产室内的垫料质量。饮食变量可能是商品肉鸡生产中亚临床NE变化的主要原因。多糖，脂质，蛋白质来源，蛋白质消化率和抗营养因子的存在差异已被确定为影响疾病发病率的变量。

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