Ciatostomíneos (Strongylidae-Cyathostominae) parásitas de cávalos: Ecología experimental dos estágios pré-parasíticos em gramínea tifton 85 (Cynodon spp. cv. Tifton 85) na baixada Fluminense, RJ, Brasil

distribution, longevity and migration of cyathostominae free living stages have been studied in differents types of climate in the world. few works exist on this subject in south america. the objective of this research was evaluating survival and migration in tifton 85 (cynodon spp. cv. tifton 85) sward in tropical climate. fecal plots were monthly placed on pasture tifton, from september of 2003 to september of 2004. sward and faeces were collected weekly, at 8 a.m., 1 and 5 p.m. and processed by baermann technique. l3survival on faeces varied from four to nine weeks in rainy period and from eight to 15 weeks in dry period, with higher recovered in rainy period. in the pasture,larvae longevity varied from two to eight weeks in rainy period and from five to 13 weeks in dry period, with higher l3 recovery in dry period. the multivariable weeks in dry period, with higher l3 recovery in dry period. the multivariable analysis of main components evidenced the influence of time and environmental variables on the number of recovered larvae from faeces and pasture. climatic conditions influenced the development, survival and migration of infective larvae. l3 were recovered during the three times of collection and no significant difference was observed among three times. the study results demonstrated that in tropical climate conditions cyathostominae l3 are available on faeces and pasture during whole months of the year