[Influence of breed and herd size on the intra-herd prevalence of Salmonella enterica subspecies diarizonae serovar 61: k: 1, 5, (7) in sheep].

IF 0.4 4区农林科学 Q4 VETERINARY SCIENCES

Tieraerztliche Praxis Ausgabe Grosstiere Nutztiere Pub Date : 2023-12-01 Epub Date: 2023-09-18 DOI:10.1055/a-2121-2635

Lisa Heinemann, Ulrich Methner, Anne Klassen, Karsten Donat, Udo Moog

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引用次数: 0

Abstract

Subject and aim: At present, only little information is available on the within-flock prevalence of Salmonella enterica subspecies diarizonae serovar 61: k: 1, 5, (7) (SASd) in sheep flocks in Germany as well as their possible influencing factors. The aim of the study was to investigate relationships between flock size, breed and within-flock prevalence.

Material and methods: A total of 1610 clinically healthy ewes from 14 sheep flocks of 9 different breeds aged 2 to 12 years were microbiologically tested for SASd by nasal swab and fecal samples. Linear multivariable models were used to analyse the associations between within-flock prevalence and farm factors (flock size, breed) or detection frequencies in fecal or nasal swabs.

Results: SASd was detected in all sheep flocks examined, with 75% of adults having at least one positive nasal or fecal result. In comparison to the 11 flocks in which commercial breeds were kept, the 3 flocks of landraces had a lower apparent within-flock prevalence (p=0.01). No association with herd size was evident. With respect to the age of the ewes, there was a negative relationship (p=0.05) with the frequency of detection of SASd in the nasal swab but not in the fecal swab. The health status and fertility performance of the flocks were in line with a normal range for commercial sheep flocks, with lambing losses of 5% to 10% and lambing scores of 130% to 158%.

Conclusions: Despite the high prevalence of SASd infections particularly within commercial breeds, there was no evidence of a relevant risk to sheep health. Compared with commercial breed flocks, a lower spread of SASd within flocks keeping landraces was evident.

Clinical relevance: Despite a high prevalence, infections with SASd are very unlikely to lead to clinical symptoms or disease. Regulation and monitoring of SASd in sheep are of low priority for animal health authorities.

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[品种和羊群规模对绵羊肠道沙门氏菌亚种diarizonae血清型61:k: 1,5，(7)的影响]。

主题与目的:目前，关于德国羊群中diarizonae亚种61:k: 1,5， (7) (ssad)的群内流行情况及其可能的影响因素的资料很少。本研究的目的是调查群大小、品种和群内流行率之间的关系。材料与方法:选取2 ~ 12岁、14个羊群、9个不同品种的1610只临床健康母羊，采用鼻拭子法和粪便法对SASd进行微生物学检测。采用线性多变量模型分析群内流行率与农场因素(群大小、品种)或粪便或鼻拭子检测频率之间的关系。结果:在所有被检查的羊群中都检测到ssad, 75%的成年羊至少有一项鼻腔或粪便阳性结果。与饲养商品品种的11个鸡群相比，3个地方品种的鸡群内表观患病率较低(p=0.01)。与兽群大小无明显关联。对于母羊的年龄，鼻拭子中SASd的检出频率与之呈负相关(p=0.05)，而粪便拭子中SASd的检出频率与之无关。产羔损失为5% ~ 10%，产羔得分为130% ~ 158%，羊群的健康状况和生育性能符合商业羊群的正常范围。结论:尽管ssad感染率很高，特别是在商品品种中，但没有证据表明对绵羊健康有相关风险。与商品种鸡群相比，SASd在地方种鸡群中的传播明显较低。临床相关性:尽管流行率很高，但ssad感染不太可能导致临床症状或疾病。动物卫生主管部门对绵羊ssad的监管和监测的重视程度较低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Tieraerztliche Praxis Ausgabe Grosstiere Nutztiere Veterinary-Food Animals

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