10th IEIDC Abstracts-Parasitology 185 Body development of five Thoroughbred foal generations naturally infected with cyathostomins C.L.H. Abrah~ ao 1 , L.L.D. Castro 1 , C.M. Miyazaki 1 , U.Y. Yoshitani 1 , J. Antunes 2 , M.B. Molento* 1, 3 1 Federal University of Parana, Laboratory of Parasitic Diseases; 2 Sao Jose da Serra Stud, Curitiba, Paran a; 3 INCT, National Institute of Science and Technology - Livestock, Brazil Most horse breeders are extremely concern about the impact of parasites on the healthiness of their animals. Although parasite control using systemic anthelmintics is very secure, drug resis- tance has been reported worldwide (Canever et al. 2013; Peregrine et al. 2014). This study aimed to determine the development of Thoroughbred foals related to sex, month and year of birth and parasite faecal egg counts (EPG). Data of five generations (2008- 2012) was handled from a horse farm located in the city of Sao Jose dos Pinhais, South of Brazil. The animals were from birth to 18 months old (n¼119 foals: 60 males and 59 females). The farm technical team provided monthly data on height and weight of the individuals. The body weight was measured with a mechanical scale and the withers height was measured using a depth measuring tape. For the individual animal EPG records, reports from 2009 to 2012 were used. EPG was performed using a modi- fied McMaster technique (x25). During all the evaluation periods it was observed that females were taller (p¼0.0065) and heavier (p¼0.0091) than males at birth. Males born in November were lighter than the other animals born in other months (p¼0,0002) at the age of six months. At the age of 12 months, females born in July and August were significantly heavier than females born in the other months, and those born in November were lighter compared to the others (p¼0.03). EPG was divided in six categories: from 0 to 25, 50 to 100, 125 to 225, 250 to 350, 375 to 500, 525 to 800 and above 800, and the average frequency was 21, 11, 10, 11, 8, 13 and 26%, respectively for all years. There was no correlation of EPG and the other variables, indicating that the presence of high or low EPGs did not interfere with body development. This was possible because of the excellent farming system, which included balanced concentrate food and a high quality alfalfa and pasture. Thus, if EPG values had no influence evidencing anybody development impediment in young horses, we suggest that other phenotypic and/or genotypic diagnostic shall be developed for parasite monitoring when animals are raised in ideal conditions. References [1] Canever, RJ et al. 2013. Lack of Cyathostomin sp. reduction after anthelmintic treatment in horses in Brazil. Veterinary Parasitology 194 (1): 35-39. [2] Peregrine, A. et al. 2014. Anthelmintic resistance in important parasites of horses: does it really matter? Veterinary Parasitology 201 (1): 1-8. 157 Insights, experiences and scientific findings of a successful worm control in several European countries and the perspectives for the future K. Pfister* 1, 2 , M. Scheuerle 1, 3 , D. van Doorn 4 , E. Osterman Lind 5 , M. Stear 6 , M. Menzel 7 , R. Farkas 8 , B.L. Steiner 9 , E. Rotenanger 10 , H. Hertzberg 11 , A. Becher 1,12 1 Comparative Tropical Medicine and Parasitology, LM-University. D-80802 Munich; 2 Parasite Consulting GmbH, Wendschatzstrasse 8, CH-3006 Berne; 3 Labor Alomed, Oeschlestrasse 77, D-78315 Radolfzell; 4 Faculty of Veterinary Medicine, Utrecht University, Utrecht; 5 National Veterinary Institute (SVA), Parasitological Diagnostics, SE-751 89 Uppsala; 6 Institute of Biodiversity, University of Glasgow, Garscube Campus, Glasgow G61 1QH; 7 Pferde- & Kleintierpraxis, Thurmading 2, D-84568 Pleiskirchen; 8 Department of Parasitology and Zoology, Faculty of Veterinary Science, Budapest; 9 Zoetis Schweiz GmbH, Sch€ arenmoosstrasse 99, CH-8052 Zurich; 10 Labor Zentral, Stationsweg 3, CH-6232 Geuense11; 11 Institute of Parasitology, Vet-Suissse Faculty, University of Zurich, CH-8057 Zurich; 12 dr becher griesbauer gmbh, Hans-Adlhoch-Str. 13, D-94315 Straubing It is now well accepted that the system of regularly administered anthelmintic treatments over years (without prior diagnosing, i. e. the so-called “strategic” or “interval-dose” treatment) has significantly contributed to the development and spread of anthelmintic resistance (AR) of horse helminths. The high fre- quency of AR of small strongyles against Benzimidazoles and partly also against Tetrahydropyrimidines together with an increasing spread of AR of P. equorum against macrocyclic lac- tones urgently require epidemiologically appropriate deworming approaches. The introduction of a selective (targeted) anthel- mintic treatment schedule (SAT) in various European countries has revealed a series of new and most promising insights and scientific findings as presented in this overview: Since the introduction of SAT e mostly only about 5-6 years ago - already thousands of horses on hundreds of farms participate in this system in various countries incl. Germany, the Netherlands, Danmark, Sweden, Switzerland, etc., representing thus a very high compliance for such a treatment schedule. This high degree of compliance is particularly also important for two reasons: 1) It reflects a willingness of horse owners and vets for pre-treatment parasitological exams and 2) these exams are the basis and clearly manifest their readiness for an evidence-based, parasite-specific anthelmintic intervention. The SAT approach is fully in line with Contents lists available at ScienceDirect Journal of Equine Veterinary Science journal homepage: www.j-evs.com 0737-0806/$ e see front matter. Journal of Equine Veterinary Science 39 (2016) S45eS55