Use of molecular biomarkers to estimate manganese requirements for broiler chickens from 22 to 42 d of age

文献类型： 外文期刊

第一作者： Lu, Lin

作者： Lu, Lin;Chang, Bin;Liao, Xiudong;Zhang, Liyang;Luo, Xugang;Chang, Bin;Wang, Runlian

作者机构：

关键词： Gene expression;Manganese;Manganese-containing superoxide dismutase;Dietary requirements;Broilers

期刊名称：BRITISH JOURNAL OF NUTRITION （ 影响因子：3.718； 五年影响因子：4.816 ）

ISSN： 0007-1145

年卷期： 2016 年 116 卷 9 期

页码：

收录情况： SCI

摘要： The present study was carried out to evaluate dietary Mn requirements of broilers from 22 to 42 d of age using molecular biomarkers. Chickens were fed a conventional basal maize-soyabean meal diet supplemented with Mn as Mn sulphate in graded concentrations of 20 mg Mn/kg from 0 to 140 mg Mn/kg of diet for 21 d (from 22 to 42 d of age). The Mn response curves were fitted for ten parameters including heart Mncontaining superoxide dismutase (MnSOD) mRNA and its protein expression levels and the DNA-binding activities of specificity protein 1 (Sp1) and activating protein-2 (AP-2). Heart MnSOD mRNA and protein expression levels showed significant quadratic responses (P < 0.01), and heart MnSOD activity showed a broken-line response (P < 0.01), whereas Mn content and DNA-binding activities of Sp1 and AP-2 in the heart displayed linear responses (P < 0.01) to dietary Mn concentrations, respectively. The estimates of dietary Mn requirements were 101, 104 and 94 mg/kg for full expressions of MnSOD mRNA level, MnSOD protein level and MnSOD activity in the heart, respectively. Our findings indicate that heart MnSOD mRNA expression level is a more reliable indicator than heart MnSOD protein expression level and its activity for the evaluation of Mn requirement of broilers, and about 100 mg Mn/kg of diet is required for the full expression of heart MnSOD in broilers fed the conventional basal maize-soyabean meal diet from 22 to 42 d of age.

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