Effect of dietary supplementation of organic zinc on laying performance, egg quality and some biochemical parameters of laying hens
Effect of dietary supplementation of organic zinc on laying performance, egg quality and some biochemical parameters of laying hens
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DOI：
10.1111/jpn.12793
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发表时间：
2018-04-01
影响因子：
2.7
通讯作者：
El-Kholy, M. S.
中科院分区：
文献类型：
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作者：
Abd El-Hack, M. E.;Alagawany, M.;El-Kholy, M. S.
本试验旨在研究蛋氨酸锌（Zn-Met）对22 ~ 34周龄蛋鸡生产性能、蛋品质、抗氧化状态及血清生化指标的影响。试验选用22周龄海塞克斯褐蛋鸡120只，随机分为5个处理，每个处理6个重复（4只/重复）。试验组在基础日粮中添加蛋氨酸锌25、50、75和100 mg/kg，对照组在基础日粮中不添加蛋氨酸锌。日粮中添加蛋氨酸锌对仔猪的体重、增重和饲料转化率无显著影响。然而，观察到对每日采食量的高度显著影响。在日粮中添加高水平蛋氨酸锌（100 mg/kg日粮）组的产蛋数、蛋重和蛋重均高于其他组。除蛋形指数、蛋壳率和蛋黄指数外，所有蛋品质性状均受蛋氨酸锌影响，差异不显著（p> 0.05或0.01）。与对照组相比，日粮中添加25、50、75和100 mg/kg蛋氨酸锌可降低血清甘油三酯和低密度脂蛋白胆固醇水平。与对照组相比，血清胆固醇水平与锌蛋氨酸的所有饮食水平增加。日粮中添加蛋氨酸锌可提高血清锌含量，其中以50和100 mg/kg日粮蛋氨酸锌组血清锌含量最高。日粮蛋氨酸锌水平对血清中除铜锌超氧化物歧化酶（Cu-Zn-SOD）活性外的抗氧化指标无显著影响。Cu-Zn-SOD活性随Zn-Met添加量的增加而增加，但不同锌水平间差异不显著。结果表明，日粮中添加蛋氨酸锌可降低血清甘油三酯、低密度脂蛋白胆固醇，提高锌的营养状况，提高蛋鸡的抗氧化能力;日粮中添加100 mg/kg蛋氨酸锌可改善上述指标，提高产蛋指数和Haugh评分。
This study was conducted to evaluate the effects of zinc methionine (Zn-Met) supplementation on the performance, egg quality, antioxidant status and some biochemical parameters of blood serum in laying hens from 22 to 34weeks of age. A total of 120 Hisex Brown laying hens of 22-week-old were randomly allocated into five treatments with six cage replicates for each (four hens/replicate). Dietary treatments consisted of the basal diet with no Zn-Met supplementation (control group) and basal diet supplemented with 25, 50, 75 or 100mg Zn-Met/kg diet. No significant differences were observed on body weight, body weight gain or feed conversion ratio due to dietary Zn-Met supplementation. However, highly significant impact was observed on daily feed intake. Egg number, egg weight and egg mass were increased in the group fed diet supplemented with the highest level of Zn-Met (100mg/kg of diet) as compared to other groups. All egg quality traits were statistically (p>.05 or .01) affected as a response to dietary Zn-Met supplementation except egg shape index, shell percentage and yolk index. In comparison with the control group, dietary supplementation of 25, 50, 75 or 100mg Zn-Met/kg decreased serum triglyceride and LDL-cholesterol levels. Serum cholesterol level was increased with all dietary levels of Zn-Met in comparison with the control group. Dietary Zn-Met supplementation increased the serum content of zinc, where the highest values were recorded with 50 and 100mg Zn-Met/kg diet. Dietary Zn-Met levels did not affect the antioxidant indices in blood serum except for the activity of copper-zinc superoxide dismutase (Cu-Zn-SOD). The activity of Cu-Zn-SOD was increased with Zn-Met supplementations with no differences among supplemental zinc levels. It is concluded that dietary Zn-Met supplementation reduced serum triglyceride, LDL-cholesterol and increased Zn status and resulted in promoting antioxidant ability of laying hens, and the addition of 100mg Zn-Met/kg to layer diet was appropriate for improving the above parameters in addition to egg production indices and Haugh unit score.