Abstract: 48 Rex rabbits were divided in 4 groups at random, 12 rabbits per group, the little rex rabbits were 35 days old. 1.2 kg legume extract was added respectively in every basic diet of group Ⅰ，Ⅱ and Ⅲ,group Ⅳ was the contrast. The rabbits were fed in the uniform conditions. Effects of the new extract on the immune organ growth, the blood biochemistry index and performance were contrasted. Results showed that: first, the average daily gain of group Ⅰ was significantly weightier than the contrast by 22.80%, and the feed/growth of group Ⅰ was remarkably lower than the contrast by 18.49%(P<0.01), the rest groups had the advantage of put on weight and enhance feed rewards than the contrast. Second, experiment I had the trend of raising the ratio of eviscerated yield with giblet, and the blood biochemistry index, the immune organ/weight were decreased. All the results showed that the new type of legume extract could speed the growth of the little rabbits, enhance feed rewards, the immunity and strengthen disease resistance of the little rabbits.

Key words: legume; extract; rex rabbit; performance; immunity