Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran.
Department of Animal Pathology, Veterinary Faculty, University of Zaragoza, 50013, Zaragossa, Spain.
Vet Res Commun. 2022 Dec;46(4):1227-1238. doi: 10.1007/s11259-022-09986-5. Epub 2022 Sep 6.
Abortion is a major issue in sheep husbandry. It can result in significant economic losses and a severe public health risk. This survey assessed the infectious and non-infectious causes of abortion in Iranian sheep flocks and determined the main risk factors. In this cross-sectional survey, causes of abortion were evaluated in 757 sheep flocks, and risk factors were analysed. A checklist containing general animal information for each abortion outbreak evaluated was filled in. Data were analysed using univariate tests and multivariable binary logistic regression analysis. In this sense, parity, gestational age of the aborted fetus, vaccination protocol, mineral supplementation and history of stillbirth showed significant associations with abortion. Infectious agents such as Coxiella burnetti (22.7%), Chlamydia abortus (12.3%) and Brucella melitensis (10.4%) were the most frequently isolated in the investigated flocks, with more than 2% of abortion rates. On the other hand, non-infectious agents such as trauma, pregnancy toxaemia and vitamin E/Se deficiency were involved in those flocks with low abortion rates (less than 10%). Results revealed multiple causes of abortion outbreaks among Iranian sheep flocks, which need careful investigation to identify possible aetiology and risk factors. Further studies are necessary to evaluate if these factors are similar to other countries in the same region.
流产是绵羊养殖业中的一个主要问题。它可能导致重大的经济损失和严重的公共卫生风险。本调查评估了伊朗绵羊群流产的传染性和非传染性原因，并确定了主要的风险因素。在这项横断面调查中，评估了 757 个绵羊群的流产原因，并分析了风险因素。为每个流产事件填写了一份包含一般动物信息的检查表。使用单变量检验和多变量二项逻辑回归分析对数据进行了分析。在这种情况下，胎次、流产胎儿的胎龄、疫苗接种方案、矿物质补充和死胎史与流产有显著关联。在调查的羊群中，最常分离到的传染性病原体包括柯克斯体（22.7%）、衣原体（12.3%）和布鲁氏菌（10.4%），流产率超过 2%。另一方面，创伤、妊娠毒血症和维生素 E/硒缺乏等非传染性因素与流产率较低（低于 10%）的羊群有关。结果表明，伊朗绵羊群中存在多种流产暴发的原因，需要仔细调查以确定可能的病因和风险因素。有必要进一步研究评估这些因素是否与同一地区的其他国家相似。
