Effect of genistein on performance, egg quality and antioxidant status in postpeak hens | 染料木素对后期蛋鸡生产性能及蛋品质的影响

chinois. 探讨染料木素对产蛋后期蛋鸡生产性能、鸡蛋品质和蛋黄抗氧化指标的影响。采用单因子设计,将450只490日龄罗曼蛋鸡随机分为3组，每组3个重复，每个重复50只。Ⅰ(对照)、Ⅱ和Ⅲ组日粮中分别添加0, 500和1 000 mg/kg染料木素，每日记录各组蛋鸡的产蛋量和蛋质量，每周统计1次采食量和料蛋比，计算产蛋率。587日龄时，从每组随机取6枚鸡蛋，测定蛋形指数、蛋比重、蛋壳相对质量、蛋壳厚度、蛋壳强度、哈夫单位及蛋黄中染料木素、维生素A、维生素E和丙二醛(MDA)的含量。与Ⅰ组相比，Ⅲ组蛋鸡采食量和产蛋率显著提高(P＜0.05)，料蛋比显著降低(P＜0.05)；蛋质量、蛋形指数和蛋比重差异均不显著(P＞0.05)，蛋壳相对质量、蛋壳厚度、蛋壳强度和哈夫单位显著提高(P＜0.05)；蛋黄中染料木素含量显著提高(P＜0.05)，MDA含量显著降低(P＜0.05)，维生素A和维生素E含量差异不显著(P＞0.05)。Ⅱ组蛋鸡除蛋壳强度外，其余指标均与Ⅰ组差异不显著。在产蛋后期蛋鸡日粮中添加染料木素，可提高蛋鸡的产蛋性能及鸡蛋的品质和抗氧化能力。

anglais. The effect of genistein on performance, egg quality and antioxidant status in postpeak hens was conducted. The experiment was a one-factorial design. A total of four hundred and fifty 490-d-old roman hens were randomly divided into 3 groups (150 in each group, 50 for each duplicate). The birds of the groups Ⅰto Ⅲ were fed with the same basal diet with supplemental levels of 0, 500 and 1 000 mg/kg genistein respectively, for 490 to 587 days. Egg production and egg weights were recorded daily, whereas feed consumptions were measured weekly. At the end of 587 d, six eggs from each treatment were selected. Egg shape index, specific gravity, relative eggshell weight, eggshell thickness, eggshell strength and Haugh unit were estimated. Egg yolk genistein, vitamin A, vitamin E and malondialdehyde (MDA) levels were also estimated. Compared with the birds of group Ⅰ, the feed intake and laying rate increased significantly (P＜0.05) and feed conversion decreased significantly (P＜0.05) in groups Ⅲ. There was no difference in egg weight, egg shape index and specific gravity (P＞0.05). The relative eggshell weight, eggshell thickness, eggshell strength and Haugh unit increased significantly (P＜0.05). Egg yolk genistein level increased significantly (P＜0.05), MDA level decreased significantly (P＜0.05), and vitamin A and vitamin E levels had no difference. In addition to eggshell strength, there was no difference in all the other index in group Ⅱ (P0.05). Genistein supplementation in diet of postpeak hens increased laying performance, egg quality and antioxidant status.