Abstract：
Small ruminants (sheep and goats) constantly suffer from endoparasitoses caused by gastrointestinal nematodes. Among these, the species Haemonchus contortus (Rudolphi, 1803) is considered to be the one of greatest importance within sheep farming. This nematode is difficult to control due to its resistance to most commercial anthelmintics. The aim of the present study was to assess the potential of macrochelid mites as macrobiological agents for controlling endoparasitoses of sheep caused by the nematode, H. contortus. For this, novel in vitro methodology was used, in which assessments were made not only of the predatory ability but also the population growth of mite species (Macrocheles merdarius, Macrocheles robustulus and Holostaspella bifoliata) when offered larvae of the nematode, H. contortus. The predatory ability of the mites, M. merdarius and H. bifoliata were efficient regarding their predatory ability against H. contortus nematode larvae. The mite, M. merdarius exhibited the highest predation rate with mean distribution values for the treated group of 18656 ± 10091 and for the control group of 1178 ± 712 (P < 0.0001). The species, H. bifoliata presented the highest population growth rate, with a percentage acarid recovery rate of 263% in relation to the number added initially. The data from this in vitro predation experiment suggest that, M. merdarius and H. bifoliata showed promise as macrobiological agents for controlling gastrointestinal endoparasitoses of sheep caused by the nematode, H. contortus given that both species reduced the population of this helminth by more 70% and the number of mites recovered was three times greater than the number added.
摘要：
小反刍动物(绵羊和山羊)经常遭受由胃肠线虫引起的内寄生虫。其中,扭曲的Haemonchus（Rudolphi，1803）被认为是绵羊养殖中最重要的一项。这种线虫由于其对大多数商业驱虫药的抗性而难以控制。本研究的目的是评估大螯合螨作为控制线虫引起的绵羊体内寄生虫的巨大生物制剂的潜力，H.扭曲。为此，使用了新的体外方法，其中不仅对捕食能力进行了评估，而且还对螨物种的种群增长进行了评估(Macrochelesmerdarius，提供线虫的幼虫时，粗花菜和双叶Holostaspellabifoliata），H.扭曲。螨虫的捕食能力，M.merdarius和H.biboliata对H.contortus线虫幼虫的捕食能力很有效。螨虫,medarius表现出最高的捕食率，治疗组的平均分布值为18656±10091，对照组为1178±712（P<0.0001）。物种,双歧杆菌的人口增长率最高，与最初添加的数量相比，acarid回收率为263％。这个体外捕食实验的数据表明，M.merdarius和H.biboliata显示出有望作为控制由线虫引起的绵羊胃肠道内寄生虫的大型生物制剂，H.contrortus，因为这两个物种都使这种蠕虫的种群减少了70％以上，并且回收的螨虫数量是添加数量的三倍。
