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首页> 外文期刊>Applied Microbiology >Roles of Diet and the Acid Tolerance Response in Survival of Common Salmonella Serotypes in Feces of Finishing Pigs
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Roles of Diet and the Acid Tolerance Response in Survival of Common Salmonella Serotypes in Feces of Finishing Pigs

机译：日粮和耐酸性在育成猪粪便中常见沙门氏菌血清型存活中的作用

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The persistence of Salmonella in the environment is an important factor influencing the transmission of infection in pig production. This study evaluated the effects of acid tolerance response (ATR), organic acid supplementation, and physical properties of feed on the survival of a five-strain Salmonella mixture in porcine feces held at 4 and 22°C for 88 days. Acid-adapted or non-acid-adapted nalidixic acid-resistant Salmonella strains were used to inoculate feces of pigs fed four different diets, which consisted of a nonpelleted, finely ground meal feed or a finely ground, pelleted feed that was left unsupplemented or was supplemented with K-diformate. Organic acid supplementation and physical properties of feed markedly influenced Salmonella survival, but the effects were highly dependent on storage temperature; survival was unaffected by ATR. The most pronounced effects were observed at 22°C, a temperature similar to that of finishing pig houses. The supplementation of meal diets with K-diformate significantly reduced the duration of survival ( P < 0.1) and increased rates of decline ( P < 0.0001) of salmonellae in feces compared to survival in feces of pigs fed unsupplemented meal. The pelleting of feed, compared to feeding meal, significantly reduced ( P < 0.1) the duration of survival in feces held at 22°C. Only minor effects of feed form and acid supplementation on survivor numbers were observed at 4°C. Differences in the fecal survival of Salmonella could not be related to diet-induced changes in fecal physiochemical parameters. The predominant survival of S. enterica serovar Typhimurium DT193 and serotype 4,[5],12:i:- in porcine feces demonstrates the superior ability of these serotypes to survive in this environment. Fecal survival and transmission of Salmonella in pig herds may be reduced by dietary approaches, but effects are highly dependent on environmental temperature.
机译：沙门氏菌在环境中的持久性是影响猪生产中感染传播的重要因素。这项研究评估了耐酸反应（ATR），有机酸的补充以及饲料的物理性质对五株沙门氏菌混合物在4和22°C保持88天的猪粪中存活的影响。酸适应性或非酸适应性耐萘啶酮酸的沙门氏菌菌株用于接种饲喂四种不同日粮的猪的粪便，这些日粮由未添加颗粒的细颗粒饲料或未添加颗粒的细颗粒饲料组成。辅以K-二甲酸酯。饲料中添加有机酸和饲料的物理特性显着影响沙门氏菌的存活，但其影响高度依赖于储存温度。存活率不受ATR影响。在22°C时观察到最明显的影响，该温度与完成猪舍的温度相似。与饲喂未补充膳食的猪的粪便存活相比，膳食中添加K-二甲酸酯显着减少了沙门氏菌的存活时间（P <0.1）和沙门氏菌的下降率（P <0.0001）。与饲喂饲料相比，饲料的颗粒化显着降低了（P <0.1）保持在22°C的粪便中的存活时间。在4℃下，仅观察到饲料形式和补酸对存活者数量的微小影响。沙门氏菌粪便存活的差异与饮食引起的粪便理化参数变化无关。猪粪中肠炎链球菌血清型鼠伤寒沙门氏菌DT193和4，[5]，12：i：-血清型的主要存活率证明了这些血清型在这种环境下生存的优越能力。日粮可能会降低猪群中沙门氏菌的粪便存活率和传播率，但其影响高度依赖于环境温度。

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