Vonnahme Jörg, Kreienbrock Lothar, grosse Beilage Elisabeth
Aussenstelle für Epidemiologie, Stiftung Tierärztliche Hochschule Hannover.
Berl Munch Tierarztl Wochenschr. 2008 Jan-Feb;121(1-2):33-40.
The aim of this study in breeding gilt rearing herds was to identify production-specific risk factors for an increased Salmonella seroprevalence. The statistical analysis for determining risk factors based on 10,429 animals from 40 herds. Blood samples were taken regularly between 2001 and 2003 from gilts five and six months of age. Only those herds from which at least 60 samples per year and 10 per quarter were available were included in the statistical analysis of risk factors. For this, the results of the serological examinations were combined with data obtained from a questionnaire and subsequent visual examination of the herds and their environment. Different kinds of categories were validated using sensitivity analysis. Finally, all herds with a Salmonella seroprevalence < 0.15 were classified as "Salmonella low risk", and those with a Salmonella seroprevalence > or = 0.15 were classified as "Salmonella high risk". Four of the sixteen variables could be ascertained as risk factors for enhanced Salmonella seroprevalences: the use of pelleted or granulated feed, the use of purchased feed, partially or not slatted floors in the pens, a floor space of 0.85m2/pig and the freedom of PRRSV-infection in a herd. Some of these variables were identified as risk factors in earlier studies, too. The identification of these risk factors in pig herds of a breeding company with a low Salmonella seroprevalence, emphasises the importance of these factors for controlling Salmonella infections in pig herds.
本研究针对繁殖后备母猪群的目的是确定沙门氏菌血清阳性率升高的特定生产风险因素。基于来自40个猪群的10429头动物进行确定风险因素的统计分析。在2001年至2003年期间，定期采集5至6月龄后备母猪的血样。只有那些每年至少有60份样本且每季度至少有10份样本的猪群才被纳入风险因素的统计分析。为此，将血清学检查结果与通过问卷调查以及随后对猪群及其环境进行目视检查获得的数据相结合。使用敏感性分析对不同类别进行验证。最后，所有沙门氏菌血清阳性率<0.15的猪群被归类为“沙门氏菌低风险”，而沙门氏菌血清阳性率>或 = 0.15的猪群被归类为“沙门氏菌高风险”。16个变量中的4个可被确定为沙门氏菌血清阳性率升高的风险因素：使用颗粒饲料或压片饲料、使用外购饲料、猪舍部分或全部非漏缝地板、每头猪0.85平方米的占地面积以及猪群中PRRSV感染的自由度。其中一些变量在早期研究中也被确定为风险因素。在沙门氏菌血清阳性率较低的育种公司的猪群中识别出这些风险因素，强调了这些因素对控制猪群沙门氏菌感染的重要性。
