Feeding rumen-protected gamma-aminobutyric acid enhances the immune response and antioxidant status of heat-stressed lactating dairy cows

文献类型: 外文期刊

第一作者: Cheng, Jianbo

作者: Cheng, Jianbo;Zheng, Nan;Li, Songli;Wang, Jiaqi;Zhang, Yangdong;Cheng, Jianbo;Sun, Xianzhi;Zheng, Nan;Li, Songli;Zhang, Yangdong;Wang, Jiaqi

作者机构:

关键词: Gamma-aminobutyric acid;Immune function;Antioxidant activity;Heat stress

期刊名称:JOURNAL OF THERMAL BIOLOGY ( 影响因子:2.902; 五年影响因子:3.102 )

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收录情况: SCI

摘要: This experiment was conducted to investigate the effects of rumen-protected gamma-aminobutyric acid (GABA) on immune function and antioxidant status in heat-stressed dairy cows. Sixty Holstein dairy cows were randomly assigned to 1 of 4 treatments according to a completely randomized block design. The treatments consisted of 0 (control), 40, 80, or 120 mg of GABA/kg DM from rumen-protected GABA. The trial lasted 10 weeks. The average temperature-humidity indices at 0700,1400 and 2200 h were 78.4, 80.2 and 78.7, respectively. Rectal temperatures decreased linearly at 0700, 1400, and 2200 h with increasing GABA. As the GABA increased, the immunoglobulin (Ig) A and IgG contents and the proportions of CD4(+) and CD8(+) T lymphocytes increased linearly (P < 0.05), whereas concentrations of interleukin (IL)-2, IL-4, IL-6 and tumor necrosis factor-alpha (TNF-alpha) decreased linearly (P < 0.05). The activities of superoxide dismutase (SOD), glutathione-peroxidase (GSH-PX) and total antioxidant capacity (T-AOC) increased linearly (P < 0.05), whereas malondialdehyde (MDA) content decreased linearly (P < 0.05) with increasing GABA. These results indicate that rumen-protected GABA supplementation to heat-stressed dairy cows can improve their immune function and antioxidant activity. (C) 2016 Elsevier Ltd. All rights reserved.

分类号: Q7

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