茶多酚对蛋鸡生产性能、脂类代谢及蛋品品质的影响

本研究进行了两次饲养试验。试验一选用225羽37周龄罗曼蛋鸡随机分为5个处理,在试验基础日粮中分别添加0%、0.05%、0.1%、0.2%、0.4%茶多酚(纯度40%),试验期59天;试验二选用600羽51周龄罗曼蛋鸡随机分为4个处理,分别在试验基础日粮中添加0%、0.025%、0.055%、0.1%茶多酚(纯度40%),试验为期8周。探讨了茶多酚对蛋鸡生产性能、脂类代谢、蛋品质量的影响。结果表明:(1)日粮中添加不同剂量茶多酚对蛋鸡产蛋率和饲料利用率有一定的改善,但未见随茶多酚添加水平的升高而提高的趋势。(2日粮中添加0.1%茶多酚可提高蛋黄中VE58.99%、VA20.96%,添加0.025%茶多酚降低蛋黄中胆固醇35.28%,茶多酚对全蛋中含硫氨基酸有增高趋势,重金属指标符合无公害鸡蛋要求;产蛋后期日粮中添加0.025%～0.1%茶多酚可降低破软蛋率31.59%～47.09%。(3)日粮中添加0.4%茶多酚分别降低46周龄蛋鸡血清总胆固醇19.65%、甘油三酯19.99%、低密度脂蛋白7.69%,提高高密度脂蛋白45.35%;但添加0.025%～0.1%茶多酚对59周龄蛋鸡血脂指标未见显著影响。

Effect of Dietary Tea Polyphenols on Performances,Lipid Metabolism and Egg Quality of Laying Hens

There were two feeding trials in this research. 225 37-week-old Lohamann laying hens were randomly divided into five treatments for trial one,fed a basal diet supplemented with 0, 0.05, 0.1, 0.2, 0.4 percentage tea polyphenols(TP) for a period of 59 days, respectively.600 51-week-old Lohamann laying hens were randomly divided into four treatments for trial two, fed a basal diet added with 0, 0.025, 0.05, 0.1 percentage TP for a period of 8 weeks, respectively. Dietary effects of TP supplementation on performance, lipid metabolism and egg quality were investigated in laying hens. The results showed that: (1) Egg production and feed conversion efficiency were improved to a certain extent by supplementing TP, but they were not improved with the increasing levels of added TP. (2) The addition of 0.1% TP in diet increased egg yolk VE and VA concentration by 58.99% and 20.96%, respectively. And TP was tended to increase whole egg amino acid levels containing S. The supplementation of 0.025%0.1% TP in diet of layers at later period decreased broken and soft-shelled egg rates by 31.59G.09%. (3) The addition of 0.4% TP in diet decreased total cholesterol (TCH), triglyceride(TG), LDL-C contents of layer serum with 46 week old by 19.65%, 19.99% and 7.69%, respectively, and increased HDL-C by 45.35%. No significant change of 0.025%0.1% TP supplementation on serum lipid levels was found in layers with 59 w old.