Abstract
1. The effect of relative humidity on the survival and development of Neoascaris vitulorum eggs to the infective stage is described.2. Tables showing the percentages of eggs at different stages of development and dead eggs at weekly interval for two different sizes of faecal masses are constructed and the results discussed.3. Detailed weather graphs showing daily rainfall, average daily relative humidity and evapotranspiration for Ibadan and Obudu during the rainy season of 1964 are constructed and the effect of the weather on survival of Neoascans vitulorum eggs in pasture at these places is discussed.4. The minimum relative humidity for the survival and development of Neoascaris vitulorum eggs to the infective stage is found to be 80%. The period of survival of eggs in a dry atmosphere depends on the size of the faecal mass containing the eggs. The critical relative humidity for Neoascaris vitulorum eggs is compared with values for other ascarids of domestic animals.
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