Let Xn(2) be a subset of Cn + 1 $\backslash$ {0} any two elements of which are not propotional. We estimate the number of exceptional points in Xn(2) for several holomorphic curves and we consider the defect relation for holomorphic curves. We shall give an example for which the defect relation is extremal and then give some holomorphic curves for which the defect relation is not extremal over Xn(2). Another defect relation is also considered.
