本试验旨在研究饲粮中添加不同水平黄芪多糖(APS)对蛋鸡脂肪性状的影响。试验选取生产性能相近的380日龄海兰灰蛋鸡1 440只,随机分为6组,每组4个重复,每个重复60只。Ⅰ组为对照组,饲喂玉米-豆粕型基础饲粮,Ⅱ、Ⅲ、Ⅳ、Ⅴ、Ⅵ组为试验组,分别饲喂在基础饲粮中添加50、100、150、200和250 mg/kg黄芪多糖的试验饲粮,预试期1周,试验期8周。结果表明:试验Ⅱ组和试验Ⅳ组蛋鸡料蛋比较低,显著低于对照组和试验Ⅴ组(P<0.05)。试验组蛋鸡血清总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)和高密度脂蛋白胆固醇(HDL-C)的含量均有不同程度的降低,其中试验Ⅳ组蛋鸡血清TC含量最低,与对照组差异显著(P<0.05);试验Ⅱ组蛋鸡血清TG含量最低,显著低于对照组和试验Ⅴ组(P<0.05);试验Ⅳ组蛋鸡血清LDL-C和HDL-C含量均最低,但各组间均差异不显著(P>0.05)。试验Ⅱ、Ⅴ、Ⅵ组蛋黄中TG含量较低,显著低于对照组(P<0.05),但与其他组差异不显著(P>0.05)。各试验组蛋黄中TC和LDL-C含量有所降低,HDL-C含量有所提高,但均差异不显著(P>0.05)。结果提示,黄芪多糖能够调节脂质代谢,以50~150 mg/kg为蛋鸡饲粮适宜添加量。

The objective of this experiment was to study the effects of different dietary Astragalus polysaccharides (APS) levels on fat traits of laying hens. A total of 1 440 Hy-line laying hens at the age of 380 days with the same performance were randomly divided into 6 groups with 4 replicates per group and 60 hens per replicate. Laying hens in a control group (group Ⅰ) were fed a corn-soybean meal based diet, and others in experimental groups were fed the basal diet with 50 (group Ⅱ), 100 (group Ⅲ), 150 (group Ⅳ), 200 (group Ⅴ) and 250 mg/kg APS (group Ⅵ), respectively. The experiment lasted for 9 weeks including one week preliminary trial. The results showed that the ratios of feed to egg of laying hens in groups Ⅱ and Ⅳ were significantly lower than those in the control group and group Ⅴ (P＜0.05). APS could decrease the contents of total cholesterol (TC), triglyceride (TG), low-density lipoprotein cholesterol (LDL-C) and high-density lipoprotein cholesterol (HDL-C) in serum of laying hens to some extent. The TC content in serum of laying hens in group Ⅳ was the lowest of all groups, and there was a significant difference between group Ⅳ and the control group (P＜0.05); the TC content in serum of laying hens in group Ⅱ was the lowest of all groups, and it was lower than that in the control group and group Ⅴ (P＜0.05); the contents of LDL-C and HDL-C in serum of laying hens in group Ⅳ were the lowest of all groups, but there were no significant differences among all groups (P＞0.05). The TG content in yolk of laying hens in groups Ⅱ, Ⅳ and Ⅵ was lower of all groups, and it was lower than that in the control group (P＜0.05), but there was no significant difference between the three groups and the other groups (P＞0.05). APS could decrease the contents of TG and LDL-C, increase the content of HDL-C in yolk to some extent, but there were no significant differences among all groups (P＞0.05). In conclusion, APS can regulate lipid metabolism, and the range suitable for APS in the diet is from 50 to 150 mg/kg.