中文摘要：

本试验旨在研究饲粮中添加大豆异黄酮（SI）对哺乳母猪生产性能、血液生理生化指标及粪便微生物菌群影响。选择平均体重为（151.05±4.53）kg、体况良好及背膘厚和分娩日龄相近的初产大白猪48头,随机分为4组,每组12个重复,每个重复1头母猪。对照组饲喂基础饲粮,试验组在基础饲粮的基础上分别添加5、10和15mg/kg SI。试验期21d。结果表明：1）试验组哺乳母猪平均日采食量极显著高于对照组（P〈0.01）;10 mg/kg SI组21d泌乳量显著高于对照组（P〈0.05）,料乳比显著降低于对照组（P〈0.05）。2）10mg/kg SI组哺乳母猪血液生长激素（GH）、三碘甲状腺原氨酸（T3）、17-β雌二醇（E2）、催乳素（PRL）、总蛋白（TP）含量显著或极显著高于对照组（P〈0.05或P〈0.01）,四碘甲腺原氨酸（T4）、甘油三酯（TG）、尿素氮（UN）含量显著低于对照组（P〈0.05）。3）10和15mg/kg SI组乳脂率均显著高于对照组（P〈0.05）;15mg/kg SI组乳糖率显著高于对照组（P〈0.05）;10mg/kg SI组乳蛋白含量显著高于对照组（P〈0.05）。4）试验组粪便大肠杆菌数量均极显著低于对照组（P〈0.01）,双歧杆菌数量均极显著高于对照组（P〈0.01）。由此可见,饲粮中添加适宜水平的SI能改善哺乳母猪的生产性能、血液生理生化指标,维持肠道微生物菌群平衡。哺乳母猪适宜的SI添加水平为10mg/kg。

英文摘要：

This trial was conducted to investigate the effects of dietary soybean isoflavone（SI）levels on performance,blood physiological and biochemical indices and fecal microorganism flora of lactating sows.A total of 48 large white pigs with body weight of（151.05±4.53）kg（which had good condition,similar back fat and birthday age）were randomly arranged into 4groups with 12 replicates per group and 1lactating sow per replicate.The control group was fed a basal diet,and three trial groups were fed the basal diet supplemented with 5,10 and 15 mg/kg SI,respectively.The experiment lasted for 21 days.The results showed as follows：1）the average daily feed intake of trial groups was significantly higher than that of the control group of lactating sows（P〈0.01）;the 21 days milk yield of 10 mg/kg SI group was significantly higher than that of the control group（P〈0.05）,and the feed/lactating of 10mg/kg SI group was significantly lower than that of the control group（P〈0.05）.2）The content of growth hormone,triiodothyronine,estrogen,prolactin and total protein in blood of 10 mg/kg SI group were significantly higher than those of the control group of lactating sows（P〈0.05）,while the contents of tetraiodothyronine,glycerin trilaurate and usea nitrogen in blood of 10mg/kg SI group were significantly lower than those of the control group（P〈0.05）.3）The butterfat ratio of 5and 10mg/kg SI groups was significantly higher than that of the control group（P〈0.05）,the lactose ratio of 15 mg/kg SI group was significantly higher than that of the control group（P〈0.05）,the lactoprotein content of 10mg/kg SI group was significantly higher than that of the control group（P〈0.05）.4）The fecal Escherichia coli number of trial groups was significantly lower than that of the control group（P〈0.01）,and the fecal Lactobacillusnumber of trial groups was significantly higher than that of the control group（P〈0.01）.In conclusion,dietary supplementation of SI at proper level can improve