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太平洋西北地区食源性病原体的流行牛肉料场牛被养两种不同的直接养微生物

Makenzie G Flach¹, Onay B Dogan¹, Wanda M Kreikemeier¹

¹International Center for Food Industry Excellence, Department of Animal and Food Sciences, Texas Tech University, Lubbock, TX 79409, USA.

Journal of food protection

|August 11, 2023

概括

直接养的微生物 (DFM) 在肉牛中进行了测试,以减少食物传播的病原体. 一个DFM,NP51/NP24,显示了Enterobacteriaceae的显著减少,而L28则减少了Clostridium perfringens. 这两种方法都减少了大肠杆菌O157:H7的流行率.

科学领域:

食品安全食品安全
动物科学动物科学
微生物学微生物学

背景情况:

人们对肉牛的兴趣增加,因为肉牛的食源病原体和食用作物的污染风险增加.
关于收获前病原体减少的研究减少,重点转向收获后减轻.
需要有效的收割前策略来减少牛中的病原体负载.

研究的目的:

评估两种不同的直接养微生物 (DFM) 在减少肉牛中食源性病原体和指标细菌的有效性.
为了确定沙门氏菌,大肠杆菌O157:H7,肠杆菌和C.perfringens的流行率和度,在养特定DFM的牛中进行了测试.
评估DFM对商业料场环境中的病原体脱落的影响.

主要方法:

实地研究涉及商业料场的3,708只杂交一年生牛.
随机分配到两个接受不同DFM的治疗组:i) 乳酸菌 (NP51) 和Propionibacterium freudenreichii (NP24) 或ii) 乳酸菌 (L28).
在第0,21,42,63和103天收集的便样本分析了病原体的存在和度.

主要成果:

牛养L28的C.perfringens度显著降低 (p < 0.05).
大肠杆菌O157:H7的患病率在各组之间相似,直到第103天,L28为40%,NP51/NP24为65%.
与L28相比,NP51/NP24补充剂在103天内显著减少了2.4log10CFU/g的肠杆菌. 沙门氏菌没有被显著地检测到.

结论:

直接养的微生物可以影响肉牛中特定的食源病原体和指标细菌的流行率和度.
采摘前的缓解策略,如DFM补充,对于减少与牛肉产品相关的食物传播病原体风险至关重要.
需要进行进一步的研究,以优化DFM的使用,以便在牛作业中全面控制病原体.

关键词:

牛类药物防御 (NP51/NP24) 提供克洛斯特里 (Clostridium perfringensens) 是一种有毒的植物.大肠杆菌 E. coli O157:H7 的情况.它们是Enterobacteriaceae的细菌.收获前食品安全收获前食品安全普罗比康 (L28) 是一种

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