Abstract: This study was aimed to statistically analyze the body weight and size(withers height, body oblique length, heart girth, cannon bone circumference) of Hubei black-head goats in three generations, so as to evaluate the effect of breeding. The results showed that through three generations of breeding, the core group of each generation of Hubei black-head goats has been improved. However, the increment varied from generation to generation, which basically showed that the growth rate was slow growth from zero generation to first generation, fastest growth from first generation to second generation, and slowest growth from second generation to third generation, coefficient of variation was relatively stable. After the third generation of breeding, the indexes of body weight and body size were basically stable. Compared with the body weight and size index of zero generation, that of third generation significantly increased at each month's age. The body weight average increment of ewes was 12.45%, and the body size increment was 4.37%. The weight increment of rams was 15.06% and the body size increment was 7.40%.

Key words: Hubei black-head goats, continuous breeding, body weight, body size