Waller P J, Donnelly J R, Dobson R J, Donald A D, Axelsen A, Morley F H
Division of Animal Health, CSIRO McMaster Laboratory, Glebe, New South Wales.
Aust Vet J. 1987 Nov;64(11):339-43. doi: 10.1111/j.1751-0813.1987.tb06062.x.
The pre-weaning production of ewes and lambs in spring on pastures grazed during the previous autumn and early winter by either weaner sheep, adult sheep, or cattle was investigated together with estimating the benefits of pre- and post-lambing drenches to ewes. These treatments were compared with one in which parasitism was uncontrolled in ewes lambing on pastures grazed previously by untreated weaner sheep, and another where parasitism was suppressed by 2-weekly drenching of the weaner sheep and also of the ewes and their lambs. Prior grazing by cattle effectively eliminated infection of pastures with intestinal Trichostrongylus and Nematodirus spp, but less so for Ostertagia spp. Worthwhile reductions in contamination were also achieved by grazing by adult sheep compared with grazing by undrenched weaners. Despite differences in the parasitological status of the pastures, there were no indications that pre-weaning growth rates of lambs were affected. However, wool growth in ewes was reduced by 10 to 20% by parasite infection. Wool growth of ewes on pastures grazed by cattle during the pre-experimental period exceeded that on any other treatment, and was significantly greater than that of ewes on pastures grazed by undrenched weaners. There was no production benefit in giving a pre-lambing drench to ewes on plots contaminated by weaners, or in giving the additional post-lambing drench to ewes grazing on plots contaminated by weaners, adult sheep or cattle.
对在去年秋季和初冬由断奶羔羊、成年羊或牛放牧过的牧场上春季产羔母羊和羔羊的断奶前生产情况进行了调查，并评估了产前和产后给母羊驱虫的益处。将这些处理方法与以下两种情况进行了比较：一种是在未经处理的断奶羔羊先前放牧过的牧场上产羔的母羊，其寄生虫感染情况未加控制；另一种是通过对断奶羔羊以及母羊和羔羊每两周进行一次驱虫来抑制寄生虫感染。牛先前的放牧有效地消除了牧场中肠道毛圆线虫和细颈线虫属的感染，但对奥斯特他线虫属的感染消除效果较差。与未驱虫的断奶羔羊放牧相比，成年羊放牧也实现了显著的污染减少。尽管牧场的寄生虫学状况存在差异，但没有迹象表明羔羊的断奶前生长速度受到影响。然而，寄生虫感染使母羊的羊毛生长减少了10%至20%。在实验前期由牛放牧的牧场上母羊的羊毛生长超过了其他任何处理方式下的母羊，且显著高于在未驱虫的断奶羔羊放牧的牧场上母羊的羊毛生长。对于在由断奶羔羊污染的地块上产羔的母羊进行产前驱虫，或者对于在由断奶羔羊、成年羊或牛污染的地块上放牧的母羊进行额外的产后驱虫，均未带来生产效益。
