1. The aim of this study was to determine the effect of dietary taurine supplementation on growth performance, meat quality and antioxidant responses in breast muscle of broiler chickens.2. A total of 72 Arbor Acres broiler chickens (28-day-old) with similar body weight were randomly allocated into two groups, and fed either 0 g/kg (control; C) or 5 g/kg taurine-supplemented diets (TS) for 14 days.3. The results showed that TS had no effect on growth performance or chemical composition of breast muscle in broilers. The drip and cooking losses were significantly decreased (P < 0.05), and the pH24h of breast muscle were increased (P < 0.05) in the TS group. Meanwhile, broilers in the TS group exhibited significantly higher (P < 0.05) scavenging activities of superoxide and 2,2-diphenyl-1-picrylhydrazyl radicals, and lower (P < 0.05) contents of carbonyl, malondialdehyde, and 4-hydroxynonenal. TS increased (P < 0.05) total antioxidant capacity and superoxide dismutase activities. Moreover, TS significantly upregulated (P < 0.05) the mRNA expressions of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase 1, NAD(P)H quinone dehydrogenase 1, superoxide dismutase, catalase, and glutathione peroxidase.4. These findings suggested that TS enhanced antioxidative capacity and improved breast meat quality of broilers via activating the Nrf2 pathway.

中文翻译：

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日粮补充牛磺酸可增强肉鸡的抗氧化能力并改善胸肉质量。

1. 本研究的目的是确定日粮中添加牛磺酸对肉鸡胸肌生长性能、肉质和抗氧化反应的影响。2．将体重相近的 72 只 Arbor Acres 肉鸡（28 日龄）随机分为两组，分别饲喂 0 g/kg（对照；C）或 5 g/kg 牛磺酸补充剂（TS） 14天。 3。结果表明，TS对肉鸡的生长性能或胸肌化学成分没有影响。TS组滴水和蒸煮损失显着减少（P < 0.05），胸肌pH24h升高（P < 0.05）。同时，TS组肉鸡对超氧化物和2,2-二苯基-1-苦基肼自由基的清除活性显着升高（P < 0.05），而降低（P < 0. 05) 羰基、丙二醛和4-羟基壬烯醛的含量。TS 增加 (P < 0.05) 总抗氧化能力和超氧化物歧化酶活性。此外，TS显着上调（P < 0.05）核因子红细胞2相关因子2（Nrf2）、血红素加氧酶1、NAD(P)H醌脱氢酶1、超氧化物歧化酶、过氧化氢酶和谷胱甘肽过氧化物酶的mRNA表达。4．这些发现表明，TS通过激活Nrf2通路增强了肉鸡的抗氧化能力并改善了胸肉品质。NAD(P)H 醌脱氢酶 1、超氧化物歧化酶、过氧化氢酶和谷胱甘肽过氧化物酶。 4．这些发现表明，TS通过激活Nrf2通路增强了肉鸡的抗氧化能力并改善了胸肉品质。NAD(P)H 醌脱氢酶 1、超氧化物歧化酶、过氧化氢酶和谷胱甘肽过氧化物酶。 4．这些发现表明，TS通过激活Nrf2通路增强了肉鸡的抗氧化能力并改善了胸肉品质。