Torbert B J, Klei T R, Lichtenfels J R, Chapman M R
J Parasitol. 1986 Dec;72(6):926-30.
Ponies reared with minimal or no exposure to anthelmintics were surveyed for intestinal helminths in order to estimate prevalence and intensity of parasite populations unaltered by frequent exposure to anthelmintics. Thirty-seven mixed breed ponies of varying ages were examined. Thirty-four species of nematodes and 2 species of cestodes were found. Twenty-four of the nematode species (including 1 new species) were in the subfamily Cyathostominae (small strongyles). Eighty-seven percent of the total burden of adult small strongyles in the large intestine was composed of 10 species. By comparing the results of the present survey with those of recent surveys of horses from herds which had been subjected to treatments with anthelmintics, the effect of prolonged usage of anthelmintic treatment on the prevalence of individual species possibly can be estimated. The general ranking of the 10 most common cyathostome species was similar to those described in recent surveys of horses, suggesting that anthelmintic pressure does not affect the prevalence of most cyathostome species. The lack of anthelmintic treatment appeared not to affect prevalence rates for Anoplocephala perfoliata and Anoplocephala magna when compared to other studies. Conversely, prevalence rates for Strongylus spp., Triodontophorus spp., Craterostomum acuticaudatum, Oxyuris equi, and Parascaris equorum were higher than those reported for these species in recent studies of horses.
对极少接触或未接触驱虫药的小马进行肠道蠕虫调查，以估计未因频繁接触驱虫药而改变的寄生虫种群的流行率和感染强度。检查了37匹不同年龄的混种小马。发现了34种线虫和2种绦虫。其中24种线虫（包括1个新物种）属于杯口线虫亚科（小型圆线虫）。大肠中成年小型圆线虫总感染量的87%由10个物种组成。通过将本次调查结果与近期对接受过驱虫药治疗的马群的调查结果进行比较，或许可以估计长期使用驱虫药治疗对单个物种流行率的影响。10种最常见的杯口线虫物种的总体排名与近期对马的调查中描述的相似，这表明驱虫药压力不会影响大多数杯口线虫物种的流行率。与其他研究相比，未进行驱虫药治疗似乎并未影响叶状裸头绦虫和大裸头绦虫的流行率。相反，在近期对马的研究中，圆线虫属、三齿线虫属、尖尾漏斗线虫、马尖尾线虫和马副蛔虫的流行率高于报道的这些物种的流行率。
