Arecent paper by Richard K. Gast et al has been extremely useful in understanding how feed additives can counter the threat of salmonellosis even though they have no direct effect on rodent, insect or environmental contamination on the farm.All animals rely on commensal microflora in the gut for both maturation and function of the mucosal immune system. Under intensive growing conditions, such as a commercial farm, the growth and development of these commensal microflora can be compromised.This is partially due to a fast passage of digesta through the gut. Problems also occur because of the existence of an inhibitory elevated pH as a result of alkaline minerals such as calcium salts being fed at high inclusions in the ration to maintain egg quality and bone strength.
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机译：Richard K. Gast等人的Arecent论文对理解饲料添加剂如何抵抗沙门氏菌的威胁非常有用，即使它们对农场的啮齿动物，昆虫或环境污染没有直接影响。所有动物都依赖于共生微生物肠黏膜免疫系统的成熟和功能。在密集的生长条件下，例如商业农场，这些共生微生物的生长和发育可能会受到损害，部分原因是消化菌快速通过肠道。由于碱性矿物质（如钙盐）以定量添加高含量添加以维持鸡蛋质量和骨骼强度，因此存在抑制性pH升高的问题，因此也会出现问题。
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