Eysker M, Jansen J
Res Vet Sci. 1982 Mar;32(2):203-5.
The development of trichostrongylid infections was studied in ewes, lambs and tracer lambs grazing a pasture which has been used by calves in the previous year. Treatment with fenbendazole of the ewes two days before they were turned out to pasture virtually prevented infections with trichostrongylid species characteristic for sheep. Significant burdens of Ostertagia leptospicularis, Cooperia oncophora and Nematodirus helvetianus were found. An increased pasture infectivity level compared to spring was observed in C oncophora and O leptospicularis in August and September. The possibility that O leptospicularis may build up to pathogenic levels in sheep and cattle as a result of alternate grazing is discussed. The two other species are probably of little significance as pathogens in sheep.
对在一块前一年曾被犊牛使用过的牧场上放牧的母羊、羔羊和追踪羔羊体内毛圆科线虫感染的发展情况进行了研究。在母羊被赶到牧场放牧前两天用芬苯达唑进行治疗，实际上预防了绵羊特有的毛圆科线虫种类的感染。发现了显著数量的细颈奥斯特他线虫、牛古柏线虫和瑞士细颈线虫。8月和9月观察到，与春季相比，牛古柏线虫和细颈奥斯特他线虫的牧场感染性水平有所增加。讨论了由于交替放牧，细颈奥斯特他线虫在绵羊和牛体内可能积累到致病水平的可能性。另外两个物种作为绵羊病原体的意义可能不大。
