Faeces of 484 horses were sampled twice with an interval of 6 weeks while anthelmintic therapy was halted. Faecal eggs counts revealed that 267 (55.2%) horses had consistently low numbers of eggs per gram faeces (EPG) (EPG <100 or = 100), 155 (32.0%) horses had consistently high EPGs (EPG > 100). Horses with consistently high EPGs were more often mares with access to pasture, aged less than 6 or more than 23 years, that were dewormed at intervals longer than 6 months, and were treated for the last time more than 3 months before the start of the study. Horses with consistently low EPGs were more often male horses with no or limited access to pasture, that were dewormed at maximally 6-month intervals, and were aged between 6 and 23 years. The results are an indication that some horses have consistently low EPGs and perhaps could be used as non-treated animals in a selective anthelmintic treatment scheme aimed at the prevention of the development of anthelmintic resistance.
- anthelmintic resistance
- nematode infections
Dopfer, D. D. V., Kerssens, C. M., Meijer, Y. G. M., Boersema, J. H., & Eysker, M. (2004). Shedding consistency of strongyle-type eggs in dutch boarding horses. Veterinary Parasitology, 124(3-4), 249-258. https://doi.org/10.1016/j.vetpar.2004.06.028