本试验旨在探讨饲粮中添加大豆黄酮对产蛋后期蛋鸡生产性能、血液指标、经济效益的影响.选取体重、产蛋率相近的56周龄海兰褐蛋鸡640只,随机分为4组(每组8个重复,每个重复20只),对照组饲喂基础饲粮,试验组饲喂在基础饲粮中分别添加10、50、100 mg/kg大豆黄酮的试验饲粮,试验期12周.结果表明:添加10 mg/kg大豆黄酮能极显著提高蛋重(P＜0.01)；添加50 mg/kg大豆黄酮能极显著提高产蛋率、降低料蛋比(P＜0.01).添加大豆黄酮显著提高了蛋鸡血清总蛋白、磷、钙、总胆固醇含量(P＜0.05),对采食量、血液常规指标及血清白蛋白含量、谷草转氨酶活性、甘油三酯含量、葡萄糖含量、碱性磷酸酶活性、雌二醇水平和孕酮水平影响均不显著(P＞0.05).从经济效益上看,添加50mg/kg大豆黄酮最好.由此可知,在蛋鸡产蛋后期饲粮中添加50 mg/kg大豆黄酮可以改善生产性能,且能够获得较佳的经济效益.%This trial was conducted to evaluate the effects of daidzein on performance, blood parameters and e-conomic benefits in laying hens during the late laying period. Six hundred and forty 56-week-old Hy-Line Brown laying hens with the similar body weight and laying rate were randomly assigned to 4 groups with 8 replicates in each group and 20 birds in each replicate, and fed basal diets supplemented with 0 (control) , 10, 50 and 100 mg/kg daidzein for 12 weeks, respectively. The results showed as follows: the supplementation of 10 mg/kg daidzein significantly increased egg weight (P <0.01), and the supplementation of 50 mg/kg daidzein significantly increased laying rate and decreased the ratio of feed to egg (P <0.01). Dietary daidzein also had significantly increased the contents of total protein, calcium, phosphorus and total cholesterol in serum of laying hens (P <0. 05), but did not significantly affect feed intake, blood routine parameters, and albumin content, aspartate aminotransferase activity, triglycerides content, glucose content, alkaline phosphatase activity, estradiol level and progesterone level in serum of laying hens (P > 0. 05). The supplementation of 50 mg/kg daidzein brings the best economic benefits. It is indicated that the supplementation of 50 mg/kg daidzein can improve performance and get better economic benefits in laying hens during the late laying period.
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