Abstract: The purpose of this experiment was to study the effects of three plant extracts，soybean isoflavones， mulberry leaf flavonoids and mulberry leaf crude extract，on the growth performance，body composition and serum biochemical indexes of Litopenaeus vannamei. The basal diet（G0，control group）was supplemented with 400 mg/kg soybean isoflavone（G1），50 mg/kg mulberry leaf flavonoid（G2），and 300 mg/kg mulberry leaf crude extract（G3）to formulate experimental diets. A total of 480 Litopenaeus vannamei with an initial body weight of（1.80±0.02）g were randomly allocated into 4 groups with 3 replicates per group and 40 shrimps per replicate. The breeding test period was 60 days. The results showed that：1）There were no significant differences in final body weight，weight gain rate， survival rate，specific growth rate and food intake of Litopenaeus vannamei among all groups（P>0.05）；the feed coefficient of Litopenaeus vannamei in G1，G2 and G3 groups was lower than that in G0 group，and that in G3 group was significantly lower than that in G0 group（P<0.05）；2）There was no significant difference in crude protein，crude fat and water content of whole shrimp in each group（P>0.05），but the crude ash content of G2 group was significantly higher than that of G3 group（P<0.05）；3）There was no significant difference in serum albumin，albumin/globulin， globulin， total protein， triglyceride， alanine aminotransferase， blood glucose， aspartate aminotransferase， cholesterol，high density lipoprotein cholesterol and low density lipoprotein cholesterol levels among the groups（P> 0.05）；the serum urea content in G2 group was significantly lower than that of G0 group（P<0.05）. In summary，the addition of 400 mg/kg soybean isoflavone，50 mg/kg mulberry leaf flavonoids and 300 mg/kg mulberry leaf crude extract to the feed could reduce feed coefficient，improve feed utilization rate，and lower serum urea content. Comprehensive evaluation，the application effect of mulberry leaf crude extract is the best. It provides a scientific basis for the application of plant extracts in Litopenaeus vannamei feed.

Key words: Plant extract, Litopenaeus vannamei, Growth performance, Serum biochemistry

摘要： 试验旨在研究三种植物提取物大豆异黄酮、桑叶黄酮和桑叶粗提取物对凡纳滨对虾 （Litopenaeus vannamei）生长性能、体成分及血清生化指标的影响。在基础饲料（G0，对照组）中 分别添加400 mg/kg大豆异黄酮（G1）、50 mg/kg桑叶黄酮（G2）和300 mg/kg桑叶粗提取物（G3） 制成试验饲料。选择初始体重为（1.8±0.02）g的凡纳滨对虾480尾，随机分成4组，每组3个重 复，每个重复40尾，养殖试验周期60 d。结果表明：1）各组凡纳滨对虾的终末体均重、增重率、 存活率、特定生长率、摄食量均无显著差异（P>0.05）；G1组、G2组和G3组凡纳滨对虾的饲料系 数均低于G0组，G3组比G0组显著降低（P<0.05）；2）各组凡纳滨对虾全虾的粗蛋白质、粗脂肪、 水分含量之间差异不显著（P>0.05），但G2组粗灰分含量显著高于G3组（P<0.05）；3）血清中白 蛋白、白蛋白/球蛋白、球蛋白、总蛋白、甘油三酯、谷丙转氨酶、血糖、谷草转氨酶、胆固醇、高密 度脂蛋白胆固醇、低密度脂蛋白胆固醇水平各组之间均无显著差异（P>0.05），但G2组血清尿 素含量显著低于G0组（P<0.05）。综上，在饲料中添加400 mg/kg大豆异黄酮、50 mg/kg桑叶黄 酮、300 mg/kg桑叶粗提取物可降低饲料系数，提高饲料利用率，并降低血清尿素含量。综合评 价，桑叶粗提取物的应用效果最好。为植物提取物在凡纳滨对虾饲料中的应用提供科学依据。

关键词: 植物提取物, 凡纳滨对虾, 生长性能, 血清生化