A survey on parasite control in sport horses of Argentina and other regional countries.

Strategies for parasite control have undergone major changes in recent years, especially in Europe and the United States, replacing traditional approaches by schemes based on surveillance and selective therapy. A first step in helminth control planning is to understand and demonstrate how horse owners or trainers currently control nematodes. The aim of this study was to collect information, through a survey, about important aspects of routine anthelmintic strategies in sport horses in Argentina and other regional countries. A total of 100 surveys were sent. Sixty nine were responded, 53% of the surveys were answered by veterinarians and 47% by managers. The majority of the respondents (58%) worked in Thoroughbred studs, followed by Throroughbred farms (23%), Horse Riding Centers (10%) and other types of centers (9%). Most respondents treated horses at fixed time every 3 months (48%). Twenty-two percent of them did it at fixed time every 6 months, 16% at fixed time every 4 months and 6% at fixed time every 12 months; 6% dewormed on individual basis while 4% did not treat at all; 2% dewormed every two months. When asked about the rationale for deworming, the majority (41%) did so based on the time elapsed since the last treatment, followed by the time of the year (22%), according to the age of the animals (15%), according to previous diagnosis (12%), 9% treated for no particular reason and 1% when the horses reached the stud. Almost half of respondents (48%) did not rotate anthelmintic drug on. In a smaller proportion, others did it every 3 months (26%), every 12 months (11%), every 6 months (9%) and finally every 4 months (6%). Half of the respondents (50%) treated horses 4 times a year, 32% did 2 times a year, 15% 3 times and 3% did not deworm at all. Regarding making a diagnosis prior to treatment, 76% of the respondents answered negatively, while 24% did so. Only 20% of respondents performed the anthelmintic efficacy test. It can be concluded that there is little participation and planning of the veterinary professional regarding the control of internal parasites in horses of Argentina. Performing coprologic tests are practices not usual in our region. Practices of parasite management seem to be reduced almost exclusively to the administration of anthelmintic drugs at fixed times, often indiscriminately.