Parasitología y Enfermedades Parasitarias, Departamento de Patología Animal: Sanidad Animal, Facultad de Veterinaria, Universidad de Santiago de Compostela, Avda Carballo Calero s/n, 27002 Lugo, Spain.
Vet Parasitol. 2011 May 31;178(1-2):108-14. doi: 10.1016/j.vetpar.2010.12.038. Epub 2011 Jan 11.
2093 Faecal samples from 74 commercial meat ovine flocks were collected and examined by the Baermann-Wetzel method for protostrongylid infection. The risk of being infected by lungworms was evaluated with a data mining classification tree (CHAID), and the intensity of infection with a general linear model (GLM). 242 out of 2093 faecal samples examined were positive for protostrongylid infection (11.6%; 95% CI 10.2-12.9). Only two species were found, Muellerius capillaris (97.9%) and Neostrongylus linearis (5.4%). 50 out of 74 farms presented at least one animal shedding protostrongylid larvae in faeces. All of them held animals infected by M. capillaris and seven presented mixed infections with N. linearis. Average larval output in infected sheep was 11.9 (SD 30.91). This study showed that protostrongylid prevalence in sheep for meat production was determined mainly by a positive interaction with Dictyocaulus filaria infection; other factors that have influenced over protostrongylid infection were age, introducing external animals in the flocks, mixed management with goats and animal density in pastures. Treatment effects on prevalence were only observed in flocks that did not introduce ewes. The lowest protostrongylid prevalence has been reported in flocks without D. filaria infection and without contact with goats.
从 74 个商业羊肉养殖场采集了 2093 份粪便样本，并采用贝曼氏湿片法检查了这些样本是否存在肺线虫感染。利用数据挖掘分类树（CHAID）和一般线性模型（GLM）评估了感染肺线虫的风险。在检查的 2093 份粪便样本中，有 242 份（11.6%；95%CI10.2-12.9）呈肺线虫感染阳性。仅发现了两种肺线虫，分别为丝状网尾线虫（97.9%）和后圆线虫（5.4%）。74 个养殖场中有 50 个养殖场至少有一头动物粪便中排出肺线虫幼虫。所有这些养殖场都有感染丝状网尾线虫的动物，有 7 个养殖场还存在混合感染后圆线虫的情况。感染肺线虫的绵羊平均幼虫排出量为 11.9（SD30.91）。本研究表明，影响肉用绵羊肺线虫感染的主要因素是与网尾属线虫感染的正交互作用；其他影响肺线虫感染的因素包括年龄、在羊群中引入外来动物、与山羊混合管理以及牧场动物密度。只有在未引入母羊的羊群中才观察到治疗对流行率的影响。在未感染网尾属线虫且未与山羊接触的羊群中，肺线虫的流行率最低。
