Eysker M, Kooyman F N, Wemmenhove R
Institute for Veterinary Parasitology and Parasitic Diseases, State University of Utrecht, The Netherlands.
Vet Parasitol. 1988 Mar;27(3-4):345-52. doi: 10.1016/0304-4017(88)90048-9.
A study was undertaken to ascertain the prophylactic effect on gastrointestinal helminthiasis of (1) a single ivermectin treatment of calves 3 weeks after a late turnout on mown pasture and (2) two ivermectin treatments of calves 3 and 8 weeks after an early turnout. The single ivermectin treatment after a late turnout on mown pasture appeared to be an effective control measure for infections of Cooperia and, in particular, Ostertagia. The two treatments after an early turnout were also effective, although less so than the single treatment combined with the late turnout on mown pasture. Ivermectin treatment had no effect on the faecal egg output or the pasture larval counts of Nematodirus helvetianus. The proportion of inhibited early fourth stage larvae of Ostertagia was much higher in the control group than in either of the experimental groups.
开展了一项研究，以确定以下两种情况对牛胃肠道蠕虫病的预防效果：（1）在晚放牧于割后牧场3周后对犊牛进行一次伊维菌素治疗；（2）在早放牧后3周和8周对犊牛进行两次伊维菌素治疗。在晚放牧于割后牧场后进行的单次伊维菌素治疗似乎是控制库珀属线虫感染，特别是奥斯特他线虫感染的有效措施。早放牧后的两次治疗也有效，尽管效果不如单次治疗结合晚放牧于割后牧场。伊维菌素治疗对瑞士细颈线虫的粪便虫卵排出量或牧场幼虫数量没有影响。奥斯特他线虫早期第四期受抑制幼虫的比例在对照组中比在任何一个实验组中都高得多。
