Manlove Kezia, Branan Matthew, Baker Katie, Bradway Daniel, Cassirer E Frances, Marshall Katherine L, Miller Ryan S, Sweeney Steven, Cross Paul C, Besser Thomas E
Department of Wildland Resources & Ecology Center, Utah State University, Logan, UT, 84322, Australia; PO Box 647034, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164-7040, Germany.
United States Department of Agriculture, Animal and Plant Health Inspection Service, Center for Epidemiology and Animal Health, National Animal Health Monitoring System, Fort Collins, 80523, CO, USA.
Prev Vet Med. 2019 Jul 1;168:30-38. doi: 10.1016/j.prevetmed.2019.04.006. Epub 2019 Apr 15.
Association of Mycoplasma ovipneumoniae with pneumonia in domestic small ruminants has been described in Europe, Asia, and New Zealand but has received less attention in the United States. In 2011, the US Department of Agriculture's National Animal Health Monitoring System detected M. ovipneumoniae shedding in 88% of 453 domestic sheep operations tested in 22 states that accounted for 85.5% of US ewe inventory in 2001. We evaluated factors associated with M. ovipneumoniae infection presence and prevalence, and we compared health, lamb production, and ewe losses in infected and uninfected operations. M. ovipneumoniae detection was more common in larger operations than in smaller operations. Both likelihood of detection (at the operation level) and within-operation prevalence were higher in operations with more open management practices than in operations with more closed management practices. M. ovipneumoniae-positive operations showed significantly lower lambing rates and lower rates of lamb survival to weaning after accounting for differences in operation size and management practice. While its effect on any single rate was not particularly large, in aggregate we estimated that M. ovipneumoniae presence was associated with an approximately 4.3% reduction in annual lamb production.
绵羊肺炎支原体与家养小反刍动物肺炎的关联在欧洲、亚洲和新西兰均有报道，但在美国受到的关注较少。2011年，美国农业部的国家动物健康监测系统在22个州的453个家养绵羊养殖场中检测到，有88%的养殖场存在绵羊肺炎支原体 shedding 情况，这些州的母羊存栏量占2001年美国母羊存栏量的85.5%。我们评估了与绵羊肺炎支原体感染存在和流行相关的因素，并比较了感染和未感染养殖场的健康状况、羔羊生产情况以及母羊损失情况。绵羊肺炎支原体检测在大型养殖场比在小型养殖场更为常见。在管理方式更为开放的养殖场，检测的可能性（在养殖场层面）和场内流行率均高于管理方式更为封闭的养殖场。在考虑养殖场规模和管理方式的差异后，绵羊肺炎支原体呈阳性的养殖场的产羔率和羔羊断奶存活率均显著较低。虽然其对任何单一比率的影响不是特别大，但总体而言，我们估计绵羊肺炎支原体的存在与每年羔羊产量约4.3%的下降有关。
