Draw of stress index of the summer hot environment by milk cattle with the global warming

在九州地区的许多奶牛场，奶牛养殖业观察到牛奶产量和质量的下降，增加了夏季的夏季热应激。夏季炎热的对策已普遍推广到携带换气扇和喷雾设备。本研究调查了奶牛舍通风风机和喷雾装置的降温效果，并通过改变牛体贮热指标的效果进行了分析，分析方法是对牛体热平衡公式中的各要素进行了要求。大温差对喷雾降温有明显的降温作用，在目标牛舍内，每蒸发1m^3雾1g，可明显降温福尔斯约0.96℃。如果在白天不进行喷雾时，研究热平衡系数的变化，以了解喷雾对牛体的影响。牛体贮热量 ...更多信息 在白天不进行喷洒时，通过喷洒。牛体贮热量逐渐增加，10时左右超过100 W/m^2。喷雾开始后，温度下降，感热通量略有增加。从牛体表一侧开始，得到了很湿的潜热通量大大增加，虽然蓄热量下降到60 W/m^2左右，但仍处于夏季炎热的环境下。以0 W/m^2为标准，对某牛舍喷雾蓄热法和通风机蓄热法的蓄热条件进行了模拟研究。控制蒸发量和风速为4 m/s时，可使蒸发量达到最优状态的蒸发量范围较窄，在夏季高温环境下不能使蒸发量达到最优状态。在不进行喷雾的场所中，需要控制温度和相对湿度的最佳风速的强风，以及强风的影响成为控制饲养管理的一个问题。然后，改变对牛体施加风的方式和喷雾的散布方式，使风吹到牛体的四分之三处，进一步将雾致湿的情况进行假设，在相对湿度为60%，风速为4 m/s的情况下，温度对应的最佳环境为38℃。少

In many milk cowshed at kyushu region, the dairy farming observed the reduction of production and quality in milk increasing the summer hot stress in summer season. The countermeasure of summer hot has generally spread to carry the ventilation fan and spray equipment. This research investigated about the temperature fall effect by the equipment of the venilation fan and spraying in milk cowshed, and analyzed by the effect making change of storage heat index in cattle body.The analysis method asked for each element about the heat balance formula of cattle body. The large difference of temperature could do the fall effect of the temperature descent with spray method.Morever, in the object cowshed, when 1g fog evaporated in 1m^3 it became clear that the temperature which is about 0.96℃ falls. If the change of heat balance factor are investigated in order to see the influence on cattle body by spraying, when spray is not being performed in daytime. The amount of storage heat by cattle body … More by spraying, when spray is not being performed in daytime. The amount of storage heat by cattle body increases gradually and exceeds 100W/m^2 around from 10:00 time. When spray was started, The temperature fell and sensible heat flux increased slightly. Since a cattle body surface side, got very wet latent heat flux increased greatly, and although the amount of storage heat fell till around 60W/m^2, it was still under summer hot environment. The simulation was carried out in order to investigate the conditions for leading the storage heat by spray method and the ventilation fan method of an object cowshed to the optimal environment used as 0W/m^2. By controlling the amount of evaporation and wind velocity 4m/s, the evironmental range which can be led to the optimal state is narrow, and cannot be led to the optimal state under summer hot environment. The strong wind which draws the optimal wind velocity controlling the temperature and relative humidity required in a place which are not spraying, and the influence of a strong wind becomes control feeding management with an problem. Then, it is found that change how to apply the wind to cattle body and how to scatter spray, and a wind hits three fourths of cattle body, carry out the case where it is made to get wet for fog further to assumption, and temperature corresponds to the optimal environment to 38℃ by the case of 60% of relative humidity and wind velocity 4m/s. Less