通过西藏绵羊的代谢分析对耐热的新见解
Qiang-Jun Wang1, Zhu Meng1, Jia-Hong Chen1
1Anhui Provincial Key Laboratory of Conservation and Germplasm Innovation of Local Livestock, College of Animal Science and Technology, Anhui Agricultural University, Hefei, 230036, China.
Journal of thermal biology
|August 24, 2025
概括
西藏绵羊在暴露于热量压力时表现出增加的生理压力和降低的抗氧化能力,这表明它们对更温暖的气候敏感. 这与它们已知的感冒和缺氧适应性形成鲜明对比.
科学领域:
- 动物生理学
- 环境适应
- 代谢学
背景情况:
- 西藏绵羊适应青海和西藏高原的寒冷和低氧环境.
- 它们对中国南部等温暖地区的热应激反应尚不清楚.
- 了解HS的耐受性对于在不同气候环境中管理牲畜至关重要.
研究的目的:
- 研究西藏羊对热应激的生理和代谢反应.
- 为了比较西藏羊与耐热品种 (胡羊和黄羊) 的耐热性.
- 确定与热暴露相关的氧化应激生物标志物.
主要方法:
- 涉及西藏羊和两种耐热品种的比较研究.
- 暴露于非热应力 (THI=59.13) 和热应力 (THI=82.78) 的条件.
- 生理测量 (直肠温度,呼吸率,心率).
- 血清抗氧化剂指数的生物化学分析 (催化剂,总抗氧化能力,超氧化物脱酶).
- 血清代谢分析以确定关键代谢物.
主要成果:
- 与耐热品种相比,西藏绵羊的直肠温度,呼吸率和心率显著上升.
- 在热应激下,西藏羊的血清抗氧化剂指数 (catalase,TAC,SOD) 较低.
- 在西藏绵羊血清中,代谢分析显示抗氧化代谢物 (肌,甲,l- 氨酸,瓜诺辛) 减少,氧化应激标志物 (3- 尼托氨酸) 增加.
- 抗氧化剂与氧化应激代谢物的比例在西藏绵羊中明显较低.
结论:
- 西藏羊对热应激相对敏感, 显示生理调节和抗氧化防御受损.
- 降低抗氧化能力和变化的代谢物概况表明西藏绵羊的氧化压力很大.
- 这些发现凸显了西藏绵羊适应高温环境的局限性.
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