补锌可改善抗氧化状态，有机锌比无机锌更能提高老龄产蛋鸡的骨强度。
Zinc supplementation improves antioxidant status, and organic zinc is more efficient than inorganic zinc in improving the bone strength of aged laying hens.
机构信息
Department of Animal Science, Kashmar Branch, Islamic Azad University, Kashmar, Iran.
Department of Animal Science, Ferdowsi University, Mashhad, Iran.
出版信息
Vet Med Sci. 2022 Sep;8(5):2040-2049. doi: 10.1002/vms3.896. Epub 2022 Aug 4.
BACKGROUND
There have been some reports indicating that supplementation of zinc could alleviate the negative effects of age on egg quality in laying hens. However, information regarding these positive effects on health and zinc deposition in the body is limited.
OBJECTIVES
The aim of the present study was to investigate the effect of organic and inorganic sources of zinc on the antioxidant activity, bone strength, and zinc deposition in the tissues of older laying hens.
METHODS
In a completely randomized design, 175 Leghorn laying hens (w36) aged 80 weeks were allocated into seven treatment groups and five replications: control (without zinc supplementation), zinc sulphate treatments (15, 30, and 45 mg/kg), and organic zinc treatments (15, 30, and 45 mg/kg).
RESULTS
There was a significant increase in feed intake in the zinc sulphate and organic zinc treatments compared to the control treatment (p < 0.05). The egg mass in organic and sulphate zinc showed a significant increase. The feed conversion ratio was decreased significantly in the organic zinc treatments (p < 0.05). Both organic and sulphate zinc supplements enhanced serum superoxide dismutase activity as an antioxidant index (p < 0.05). The cortical thickness of the tibia was improved in laying hens receiving 30 mg/kg organic zinc. Supplementation of zinc could lead to an increase in zinc deposition in tissues, and organic zinc boosts bone strength.
CONCLUSION
Zinc supplementation can improve antioxidant activity, feed intake, and feed conversion ratio and enhance egg mass and optimal absorption of zinc in tissues. The use of 30 mg/kg organic zinc is recommended for improving the cortical thickness of the tibia in aged laying hens.
背景
有一些报告表明，补锌可以减轻年龄对蛋鸡产蛋性能的负面影响。然而，关于锌对健康的这些积极影响和在体内的沉积情况的信息有限。
目的
本研究旨在探讨有机锌和无机锌源对老龄蛋鸡的抗氧化活性、骨强度和组织中锌沉积的影响。
方法
采用完全随机设计，将 175 只 80 周龄海兰白蛋鸡分为 7 个处理组，每组 5 个重复：对照组（不添加锌）、硫酸锌处理组（15、30 和 45mg/kg）和有机锌处理组（15、30 和 45mg/kg）。
结果
与对照组相比，硫酸锌和有机锌处理组的采食量显著增加（p<0.05）。有机锌和硫酸锌组的蛋重均显著增加。有机锌处理组的饲料转化率显著降低（p<0.05）。有机锌和硫酸锌补充剂均增强了血清中超氧化物歧化酶活性作为抗氧化指标（p<0.05）。胫骨皮质厚度在接受 30mg/kg 有机锌的母鸡中得到改善。锌的补充可以提高抗氧化活性、采食量和饲料转化率，并提高蛋重和组织中锌的最佳吸收。建议在老龄蛋鸡中使用 30mg/kg 的有机锌来提高胫骨皮质厚度。
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