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急性热应激对肉鸡股动脉压等生理指标的影响

李 静1， 白玉梅1， 乔 健2

(1. 山西师范大学 生物技术与工程学院， 山西 临汾 041000；
2. 中国农业大学 动物医学院， 北京 100094) 

摘要： 通过对30只25日龄常温饲养的商品代雄性AA肉鸡，置于42.0℃±0.5℃控温小木箱中，给予高温刺激，并进行肉鸡股动脉压等指标的动态检测，探讨了肉鸡热应激发生发展的规律。结果显示，热暴露第10min时平均股动脉压(mFAP)显著下降（P＜0.05），第15～50min时平均股动脉压极显著下降（P＜0.01），第30min时股动脉收缩压最大变化速率（+dp/dtmax）极显著升高（P＜0.01），第50min时极显著降低（P＜0.01）；第20min时股动脉舒张压最大变化速率（︱-dp/dtmax︱）极显著升高（P＜0.01），第40min时显著降低（P＜0.05），第50min时极显著降低（P＜0.01）。平均股动脉压与呼吸频率、心率呈极显著正相关（P＜0.01，n=45），相关系数分别为0.464和0.470；与体温呈极显著负相关（P＜0.01，n=45），相关系数为-0.790。证实，肉鸡的股动脉压在短时间内极显著下降，可能为高温条件下肉鸡死亡的主要原因。

关键词： 肉鸡； 热应激； 股动脉压

中图分类号：S 851.33：X 51 文献标识码： B 文章编号：1000-6419(2004)10-0052-04

Effect of acute heat stress on physiological indexes in broiler chickens

LI Jing1, BAI Yumei1, QIAO Jian2

(1. College of Biological Technology and Engineering， Shanxi Teachers University, Linfen 041000，
China； 2. College of Veterinary Medicine, China Agricultrural University,Beijing 100094,China)

Abstract: This experiment was designed to investigate effect of 42℃ acute heat stress on physiological indexes. Everyone of thirty 25dayold male AA broilers was put randomly into a 42℃ small chamber. In the period of the experiment, femoral artery pressure (FAP) of broiler chickens, and so on， was examined continuously. The results were as follows. The mean femoral artery pressure (mFAP) decreased significantly at minute 10 (P＜0.05) and from minute 15 to 50 (P＜0.01) postexposure to heat stress. The increasing maximum rate of femoral artery systolic pressure (FASP， |+dp/dtmax |) increased significantlyat minute 30(P＜0.01), and decreased significantly at minute 50 (P＜0.01)postexposure to heatstress. The increasing maximum rate of femoral artery diastolic pressure (FADP， |-dp/dtmax|) increased significantly at minute 20(P＜0.01), and decreased significantly at minute 40(P＜0.05) and 50 (P＜0.01)postexposure to heat stress. The mFAP had significant correlation with respirationrate (r=0.464, n=45,P＜0.01)and heart rate (r=0.470,n=45, P＜0.01) respectively, and had significant negative correlation with rectal temperature(r=-0.790, n=45,P＜0.01). It was concluded from the abovementioned results that the significant decrease of FAP during the acute 42℃ heat stress may be one of major reasons of death of the broilers.

Key words: broiler chicken; heat stress; femoral artery pressure

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