Gomez H H, Georgi J R
Department of Clinical Sciences, New York State College of Veterinary Medicine, Cornell University, Ithaca 14853.
Equine Vet J. 1991 May;23(3):198-200. doi: 10.1111/j.2042-3306.1991.tb02754.x.
A programme of selective anthelmintic therapy was used in a herd of 31 horses. Faecal egg counts were done during the months of September, November, January, March, May and the following September. Horses with greater than or equal to 100 eggs per gram (epg) were treated with ivermectin, and those with less than 100 epg were not treated. The criteria for adequate internal parasite control in the herd was a median herd faecal egg count of less than or equal to 100 epg. Effectiveness of selective therapy was assessed by faecal egg count after nine months of treatment and was determined to be adequate when a median herd egg count of 0 epg was obtained. However, on returning from pasture the following September, median herd egg count had risen to 325 epg. A statistically significant correlation was seen in the paired September faecal egg counts of the horses in that initial September faecal egg count was predictive for the following September. Initial September faecal egg count was related to the number of anthelmintic treatments required during the period of selective therapy, whereas age of horse was not. We propose that faecal egg counts be incorporated into strategic anthelmintic programmes as an economical tool for identifying and targeting herd members predisposed to shedding elevated numbers of helminth eggs.
在一个拥有31匹马的马群中采用了选择性驱虫治疗方案。在9月、11月、1月、3月、5月以及次年9月进行粪便虫卵计数。每克粪便中虫卵数大于或等于100个（epg）的马匹用伊维菌素进行治疗，而每克粪便中虫卵数少于100个epg的马匹则不进行治疗。该马群内部寄生虫控制达标的标准是马群粪便虫卵计数中位数小于或等于100个epg。在治疗9个月后通过粪便虫卵计数评估选择性治疗的效果，当马群虫卵计数中位数达到0个epg时判定治疗效果达标。然而，次年9月从牧场返回时，马群虫卵计数中位数已升至325个epg。在最初9月和次年9月配对的马匹粪便虫卵计数中发现了具有统计学意义的相关性，即最初9月的粪便虫卵计数可预测次年9月的情况。最初9月的粪便虫卵计数与选择性治疗期间所需的驱虫治疗次数有关，而与马的年龄无关。我们建议将粪便虫卵计数纳入战略性驱虫方案，作为一种经济的工具，用于识别和定位易排出大量蠕虫卵的马群个体。
