Risk Factors for High Endoparasitic Burden and the Efficiency of a Single Anthelmintic Treatment of Danish Horses

Abstract

-A questionnaire survey regarding endoparasite control practices in Danish horse herds was carried out in 1995. The participating veterinarians and herd owners were sampled using convenience and purposive sampling. In the analysis of risk factors for development of a high endoparasitic burden (>200 eggs per gram faeces) 903 horses were sampled and the analysis of the efficiency of a single anthelmintic treatment was based on 605 horses. The following factors had a significant effect on the endoparasitic burden: herd type, age of the horses, use of pasture rotation, anthelmintic treatment of horses visiting the herd, use of an adviser in the planning of endoparasite control and advice regarding pasture rotation. An interaction between pasture rotation and advice regarding pasture rotation was found, but due to high collinearity this was not reported. The factors influencing significantly on the reduction of the faecal egg count after a single anthelmintic treatment were the type of herd, the age of the horse, the drug used, and the anthelmintic-resistance-status of the herd. A negative effect of permanent pastures was observed. If pasture hygiene was performed on the advice of the veterinarian, the effect of a single anthelmintic treatment was less compared to a single anthelmintic treatment without any advice. An interaction between the treatment group and the resistance-status of the herd was found. Additional factors, normally accounted for, when endoparasites and anthelmintic resistance is discussed, were investigated, but not found significant in this study. endoparasites; epidemiology; anthelmintic resistance.

Parasitological survey of Polish primitive horses (Equus caballus gmelini Ant.): influence of age, sex and management strategies on the parasite community

“…Signifi cant differences with infection of intestinal parasites associated with age were observed only for Strongylidae, P. equorum and O. equi (Table 3). Our data are consistent with similar observations on brood domestic horses (Hoglund et al, 1997;Lind et al, 1999;Larsen et al, 2002;Kornas et al, 2010;Kuzmina, 2012), and support the concept on the development of anti-parasite immunity in horses with age (Klei & Chapman, 1999). Concerning H. muscae, A. perfoliata and G. intestinalis, signifi cant differences in the levels of infection of horses of different ages were not detected.…”

“…In the analysis of species composition of the strongylid communities we found that ST horses harbored the lowest number of species of these nematodes (15), while the highest species biodiversity (30 or 31) was documented in FR horses. Our fi ndings correspond to the results of other authors who conducted similar studies in Poland (Kornas et al, 2006;Pilarczyk et al, 2010), as well as in other countries (Hoglund et al, 1997;Lind et al, 1999;Larsen et al, 2002;Kuzmina et al, 2007Kuzmina et al, , 2009Kuzmina et al, , 2011Kuzmina, 2012).…”

Intrinsic Factors Influencing the Infection by Helminth Parasites in Horses under an Oceanic Climate Area (NW Spain)

“…Several investigations have shown the effect of some factors on the infection by parasites in horses. Osterman Lind et al [ 2 ] and Larsen et al [ 3 ] observed the highest output of strongyle eggs in animals aged 2-3 years from Sweden. Bucknell et al [ 4 ] reported that in Australia cyathostomes were more prevalent in young horses, and P. equorum was found exclusively in horses less than 2 years of age, and the highest mean intensity of infection for Anoplocephala perfoliata was in those horses.…”

The effects of seasonality and group size on fecal egg counts in wild Przewalski’s horses (Equus ferus przewalskii, Poljakov, 1881) in the Chernobyl Exclusion Zone, Ukraine during 2014 – 2018

“…Significant differences in gastrointes-tinal parasite communities associated with sex were observed for intestinal strongylids: mares had significantly higher numbers of strongylids as compared to stallions (Slivinska et al, 2016). Moreover, significant differences with infection of intestinal parasites associated with age were observed for Strongylidae and Parascaris equorum infections in different breeds of horses (Lind et al, 1999;Larsen et al, 2002;Kornas et al, 2010;Kuzmina, 2012, Slivinska et al, 2016, and this supports the concept of the development of anti-parasite immunity in horses with age (Klei & Chapman, 1999). We suggest that, within the CEZ, wild horses may transmit the parasites within group at watering places or former collective farms.…”