Osterman Lind E, Höglund J, Ljungström B L, Nilsson O, Uggla A
Department of Parasitology, Swedish University of Agricultural Sciences and National Veterinary Institute, Uppsala.
Equine Vet J. 1999 Jan;31(1):68-72. doi: 10.1111/j.2042-3306.1999.tb03793.x.
Faecal egg counts were performed during the first quarter of 1995 on samples from 1183 horses of varying breeds, ages and gender on 110 farms in 3 regions of Sweden. The majority of the horses had been treated with ivermectin or pyrantel when stabled the previous autumn. The risk of reinfection with strongyles between treatment and sampling was therefore considered to be minimal. Consequently, the results reflect primarily the occurrence of worms originating from inhibited strongyle larvae refractory to anthelmintic treatment. A total of 922 (78%) individuals were found to shed strongyle eggs, and 15 (14%) of the farms studied had at least one horse infected with Strongylus vulgaris. There was a significant, gradual decrease in faecal egg output in horses originating from the southern to the northern part of Sweden. Horses from studfarms showed significantly higher numbers of strongyle eggs/g faeces (EPG) as compared to those on other types of farms, such as riding-schools and boarding stables. However, there was no correlation between herd size and mean herd EPG. The output of strongyle eggs was highest in horses aged 2 and 3 years. EPG values then declined with increasing age of the horse. Horses treated with ivermectin in the previous autumn showed significantly lower EPG values than untreated horses and those treated with pyrantel pamoate.
1995年第一季度，对瑞典3个地区110个农场的1183匹不同品种、年龄和性别的马的粪便样本进行了粪卵计数。大多数马在前一年秋天入厩时已用伊维菌素或噻嘧啶进行过治疗。因此，在治疗和采样之间再次感染圆线虫的风险被认为极小。因此，结果主要反映了源自对驱虫治疗有抗性的受抑制圆线虫幼虫的蠕虫的出现情况。总共发现922匹（78%）马排出圆线虫卵，在所研究的农场中，有15个（14%）农场至少有一匹马感染了普通圆线虫。从瑞典南部到北部，马的粪卵产量显著逐渐下降。与骑术学校和寄宿马厩等其他类型农场的马相比，种马场的马每克粪便中的圆线虫卵数量（EPG）显著更高。然而，畜群规模与畜群平均EPG之间没有相关性。2岁和3岁的马排出的圆线虫卵最多。然后，EPG值随着马年龄的增长而下降。前一年秋天用伊维菌素治疗的马的EPG值显著低于未治疗的马和用双羟萘酸噻嘧啶治疗的马。
