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The even degree of animal population is generlay measured by the coefficient of variation of major eco-rnnomic characters. Facing the coefficient of variation,a statistic with complex properties,we achieved indirectlyrnthe determination of confidence interval for even degree of an animal population by analysing the reciprocal ofrnthe statistic. The sample size which is suitable to the determination of the even degree of an animal populationrnwas probed into within the extent of permissive estimation error.