Low Airspeed Impacts on Tom Turkey Response to Moderate Heat Stress

Derek Uemura, Prafulla Regmi, Jesse Grimes, Lingjuan Wang-Li, Sanjay Shah
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Abstract

Heat stress is a concern for turkeys in naturally ventilated houses. Chamber and room studies were used to assess heat stress at moderate temperatures (<25 °C) and low airspeeds on grown tom turkeys. In the chamber study, four ventilation rates × two temperatures (thermal comfort and thermal stress, 11 °C above thermal comfort) were applied to 13- to 19-week birds. Very small differences in airspeeds among the four treatments masked subcutaneous, cloacal, and infrared (IR) temperature differences at both temperatures. In the room study, four ventilation rates (0.07 m3·min−1·kg−1 or 100%, 75%, 50%, and 30% or Control) were applied to 21-week toms housed at <23 °C. The Control treatment had significantly higher whole-body and head temperatures vs. the other treatments. Only 100% had higher weight gain vs. 50%; hematology was unaffected by treatment. Higher ventilation rates reduced heat stress due to lower room temperatures, not airspeed differences, which were very low. The low-cost IR camera detected a heat stress difference ≥ 0.8 °C, corresponding to wind chill of 0.8 °C due to an airspeed of 0.8 m·s−1 vs. still air on the USDA broiler wind chill curve. Machine vision combined with IR thermography could alleviate real-time poultry heat stress.
低空速对火鸡中热应激反应的影响
在自然通风的房子里,热应激是火鸡的一个问题。室内和室内研究用于评估中等温度(25°C)和低空速下成年火鸡的热应激。在室内研究中,对13 ~ 19周龄的雏鸟采用4种通风率× 2种温度(热舒适和热应激,比热舒适高11°C)。在四种治疗中,空气速度的微小差异掩盖了两种温度下皮下、肛管和红外(IR)温度的差异。在室内研究中,将4种通风量(0.07 m3·min - 1·kg - 1或100%、75%、50%和30%或对照)应用于安置在<23°C环境中的21周猫。对照组的全身和头部温度明显高于其他组。只有100%的人体重增加,50%的人体重增加;血液学不受治疗影响。较高的通风率减少了由于较低的室温而不是空速差异造成的热应力,空速差异非常低。低成本红外相机检测到的热应力差≥0.8°C,对应于美国农业部肉鸡风寒曲线上0.8°C的风寒,这是由于空速为0.8 m·s−1与静止空气相比。机器视觉与红外热像仪相结合可以缓解家禽的实时热应激。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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