Effects of long-term supplementation with amino acid-complexed manganese on performance, egg quality, blood biochemistry and organ histopathology in laying hens

文献类型： 外文期刊

第一作者： Cui, Yao-ming

作者： Cui, Yao-ming;Zhang, Hai-jun;Zhou, Jian-min;Wu, Shu-geng;Qi, Guang-hai;Wang, Jing;Cui, Yao-ming;Zhang, Hai-jun;Zhou, Jian-min;Wu, Shu-geng;Qi, Guang-hai;Wang, Jing;Zhang, Cheng

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关键词： Mn-amino acid complex; Layer; Performance; Biochemical parameter; Organ histopathology

期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.247； 五年影响因子：3.806 ）

ISSN： 0377-8401

年卷期： 2019 年 254 卷

页码：

收录情况： SCI

摘要： The current study was conducted to evaluate the effects of long-term dietary supplementation of amino acid-complexed manganese (Mn) on production performance, egg quality, blood biochemistry and organ histopathology in laying hens. A total of 756 Hy-Line Brown layers were randomly assigned into 7 dietary groups with 6 replicates. Each replicate contained 18 birds. Layers were fed a basal diet (Mn, 21.95 mg/kg) or the basal diet supplemented with 20, 40, 80, 120, 400 or 800 mg/kg Mn in amino acid-complexed form, respectively. The feeding trial lasted for 24 wks. Compared with the basal diet (control), dietary supplementation with 80 mg/kg Mn increased egg production and decreased feed conversion ratio (FCR) during 1-12 and 1-24 wk (P < 0.05). Manganese supplementation at 40 mg/kg increased egg production (1-12, 13-24 and 1-24 wk), egg mass (13-24 and 1-24 wk), and decreased FCR (13-24 and 1-24 wk, P < 0.05). Higher values of eggshell breaking strength were observed in dietary Mn addition >= 20 mg/kg treatments (P < 0.05) at different sampling time points, and they occurred in 40 mg/kg more frequently than any other Mn supplementation level. Dietary supplementation of 40 or 80 mg/kg Mn increased total superoxide dismutase (T-SOD) activity in serum (P < 0.05), but this benefit diminished when the inclusion exceeded 120 mg/kg. Besides, higher values of white blood cell (WBC), platelet and creatinine occurred in 400 and 800 mg/kg Mn addition groups (P < 0.05), accompanied with local inflammation of kidney tissues. In conclusion, dietary supplementation with Mn can improve productive performance, eggshell breaking strength and redox status, at a level of 40 mg/kg from Mn-amino acid complexes, and overdose of Mn supplementation (>= 400 mg/kg) would cause detrimental effects to Hy-Line Brown laying hens.

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