热应激对肉生长表现,生理反应和尸体特征的影响
Hye Ran Kim1, Pilnam Seong1, Kuk-Hwan Seol1
1National Institute of Animal Science, Rural Development of Administration (NIAS-RDA), Wanju-gun, 55365, Republic of Korea.
Journal of thermal biology
|December 25, 2024
概括
高环境温度对肉产生负面影响,减少生长并改变生理反应. 严重的热应激显著降低了料摄入量,体重增加和免疫器官发育.
科学领域:
- 动物科学动物科学
- 环境生理学环境生理学
- 养家禽生产 养家禽生产
背景情况:
- 高温环境对全球家禽生产构成重大威胁.
- 热应激会诱导代谢变化,降低体重,增加的死亡率.
研究的目的:
- 评估热应力的影响,通过温度湿度指数 (THI) 测量,对肉生长,生理学,尸体特征和血液学.
- 量化不同THI水平对肉的影响.
主要方法:
- 200只肉 (17-31天大) 暴露在受控的温度和湿度条件下14天.
- 实验组的THI水平在67 (热中性) 到84 (严重的热应激) 之间.
- 评估了生长性能,生理参数 (呼吸速率,直肠温度),血液特征和尸体特征.
主要成果:
- 严重的热应激 (THI 84) 与热中性条件 (THI 67) 相比,减少了30%的料摄入量和51%的体重增加.
- 热应激肉表现出增加的呼吸率和直肠温度.
- 血液学参数下降,包括红细胞,血红蛋白,白细胞,淋巴细胞和电解质 (K +,Na +).
- 作为免疫器官的Fabricius的毛囊在严重的热应激下显示出减少的生长.
结论:
- 高的THI水平显著损害肉生长性能和生理健康.
- 热应激对肉的血液学参数和免疫器官发育有负面影响.
- 了解这些影响对于减轻家禽生产的经济损失至关重要.
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