Ecologia de larvas infectantes de ciatostom?neos (Nematoda - Cyathostominae) de eq?inos, em gram?nea coast cross (Cynodon dactylon) irrigada e n?o irrigada em Serop?dica, RJ, Brasil

• Autor(a) principal: Chambarelli, Melissa Carvalho Machado do Couto
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFRRJ
• Texto Completo: https://tede.ufrrj.br/jspui/handle/tede/765
• topic: Ciatostom?neos; coast cross; migra??o; Cyathostomin; Bermuda grass; migration; Medicina Veterin?ria

The knowledge of cyathostomin infective larvae population level presents onto pasture is important to epidemiological purposes, estimating parasitic risk infection to horses and helping on setting up integrated control programs. The present study was elaborated in three parts: first is about the migratory dynamic and survival of cyathostomin infective larvae on Bermuda grass pasture for 12 months. Feces and grass samples were collected weekly at 8 a.m., 1 p.m. and 5 p.m. The samples were weighted and processed by Baermann technique. Higher survival of L3 was found at dry season, 15 and 12 weeks on feces and sward respectively, at rainy season the survival was smaller. The infective larvae were recovered during three times and the Kruskal-Wallis test did not present significance among them. At the second part, the ecology of cyathostomin infective larvae was studied for 24 months. During this period, samples of feces and grass (apex and base) were collected weekly. Samples were processed the same way as in the first part of the study. In the feces, cyathostomin L3 survived for up to 15 weeks, with higher recovery during the rainy period (46,228 kg-1.dh) and on the grass for up to 12 weeks. The recovery of L3 was greater during the dry period in the grass base (1,868 kg-1.dh) rather than in the apex (809 kg-1.dh). The L3 migration from feces to grass varied during the period. The last part of the study is about the effect of irrigation on cyathostomin infective larvae migration in Bermuda grass pasture during the four seasons of the year. Fecal masses of naturally infected horses were placed on Bermuda grass pasture at the beginning of each season. Samples of feces and grass were collected every two weeks at 8 a.m. and 5 p.m. until the end of each season from September/2007 to September/2008. Samples were processed the same way as in the first part of the study. The Kruskal-Wallis non parametric test showed a significant difference for L3 recovery in each season. The test did not present significance between the two times sampling. These results suggest that in conditions of Baixada Fluminense tropical climate horses are in permanent risk of infection.