U.S. Department of Agriculture, Agricultural Research Service, National Animal Disease Center, Preharvest Food Safety and Enteric Diseases Unit, P.O. Box 70, Ames, Iowa 50010, USA.
J Food Prot. 2005 Aug;68(8):1720-3. doi: 10.4315/0362-028x-68.8.1720.
Recent research has shown that much preharvest Salmonella enterica infection in pigs occurs immediately before slaughter during this rest period in the contaminated abattoir holding pens. The objective of this study was to evaluate a potential intervention strategy to reduce the prevalence of S. enterica-positive pigs at slaughter, which consisted of resting pigs prior to slaughter on their transport vehicle, instead of in the abattoir holding pen. Additionally, the effect of transportation of pigs from farm to the abattoir on S. enterica prevalence was investigated. A total of 120 animals were included in the experiment, divided in four replicates (n = 30 pigs per replicate). Fecal samples were collected from each animal at the farm and at the abattoir, where 15 randomly chosen pigs were unloaded and moved to a holding pen, while the remaining 15 pigs stayed in the transport trailer. After approximately 1.5 h of resting, both groups were slaughtered. Samples collected included distal ileum portion, cecal contents, and ileocecal lymph node. The overall S. enterica prevalence (pigs positive in at least one of the samples collected at slaughter) was higher for pigs held in the abattoir pens (40.7% versus 13.3%, P < 0.05). There was no difference (P > 0.05) for the S. enterica prevalence before and after transportation from farm to abattoir (5.8% versus 0.8%, respectively). This study demonstrates that resting pigs on the transport vehicle has the potential to decrease S. enterica levels entering the abattoir.
最近的研究表明，在污染的屠宰场畜栏休息期间，猪在屠宰前的许多沙门氏菌感染发生在屠宰前立即发生。本研究的目的是评估一种潜在的干预策略，以降低屠宰时沙门氏菌阳性猪的流行率，该策略包括在运输车辆上而不是在屠宰场畜栏中休息屠宰前的猪。此外，还研究了从农场到屠宰场运输猪对沙门氏菌流行率的影响。共有 120 只动物参与了实验，分为四个重复（每个重复 n = 30 头猪）。在农场和屠宰场从每只动物采集粪便样本，在屠宰场，随机选择 15 头猪卸车并转移到畜栏，而其余 15 头猪留在运输拖车内。休息约 1.5 小时后，两组均进行屠宰。收集的样本包括回肠远端部分、盲肠内容物和回盲淋巴结。在屠宰时采集的至少一个样本中呈阳性的猪的总体沙门氏菌流行率（阳性猪）在畜栏中饲养的猪中较高（40.7%比 13.3%，P < 0.05）。从农场到屠宰场运输前后沙门氏菌的流行率没有差异（P > 0.05）（分别为 5.8%和 0.8%）。本研究表明，在运输车辆上休息猪有可能降低进入屠宰场的沙门氏菌水平。
