Influ?ncia sazonal na din?mica migrat?ria e sobreviv?ncia de larvas infectantes de ciatostom?neos de eq?inos em gram?nea Tifton 85 na Baixada Fluminense, RJ

• Autor(a) principal: Bezerra, Simone Quinelato
• 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/766
• topic: larvas infectantes; ciatostom?neos; pastagem; sazonalidade; infective larvae; cyathostomin; pasture; sazonality; Medicina Veterin?ria

The knowledge of biology and epidemiology of cyathostomin free living stages have been helping the development of control programs that limitis anthelmintic use. However little is known about environmental larvae dynamics, mainly in tropical climate. Studies about pasture contamination can help to estimate parasitic risks for animals and to set up integrate control programs. The present study was elaborated in three complemented parts: first, it was evaluated the distribution, recovery and survival of cyatostomin infective larvae of equines in feces and pasture during 15 months. Fecal samples were monthly placed on Tifton 85 (Cynodon spp. cv. Tifton 85) pasture, from september of 2003 to september of 2004. Grass and feces were collected weekly, at 8 a.m., 1 and 5 p.m. and processed by Baermann technique. The results indicate that the environmental conditions were favorable for L3 development and survival. In feces, more L3 was recovered during the rainy period and on the grass in dry period. L3 survival was higher in the dry period for feces and grass samples. L3 were recovered during the three times of collection and no significant difference was observed among three times. The second part was more wide-ranging and approaches the distribution, recovery and survival of cyathostomin infective larvae in feces and pasture for february 2005 to march 2007. Seven days after the deposit, sample of feces and grass were collected weekly at 8 a.m., 1 p.m. and 5p.m., from three different field sites. Grass sample was divided into base (0-20 cm) and apex (20-40 cm). The samples were processed by the Baermann technique for L3 recovery. In the rainy period, more infective larvae were recovered on the feces and grass apex. In the dry period, the recovery was higher only on the grass base, as well as the L3 survival on feces and grass. More larvae were recovered at 8 a.m., except from the grass apex, where the highest recovery was at 1 p.m. The third part refers to the seasonal distribution and recovery of cyathostomin infective larvae in feces, pasture and soil. In the beginning of the seasons feces samples were placed on experimental Tifton 85 plot. The collections began one week after deposit, and later every 15 days. L3 recovered were higher in the autumn and winter and smaller in the spring and mainly in the summer. More L3 were recovered in the morning, although no statistic difference has been observed between the collection times in each season. The soil didn't demonstrate to be potential L3 reservoir, seen the low larvae recovery in this study.