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首页> 美国卫生研究院文献>Animals : an Open Access Journal from MDPI >Effects of Airspeed on the Respiratory Rate Rectal Temperature and Immunity Parameters of Dairy Calves Housed Individually in an Axial-Fan-Ventilated Barn
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Effects of Airspeed on the Respiratory Rate Rectal Temperature and Immunity Parameters of Dairy Calves Housed Individually in an Axial-Fan-Ventilated Barn

机译：空速对乳房牛犊呼吸速率直肠温度和免疫参数在轴流通风谷仓中携带的呼吸速率直肠温度和免疫参数

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The practice of raising dairy calves individually has become widespread because it helps dairy farmers guard against the spread of infectious diseases. However, a number of other health issues are associated with the insufficient airflow that develops in some of the interior spaces of a barn divided into individual stalls, especially when the stalls are separated by solid partitions. Typically, a barn’s ventilation fans are arranged in a way that will propel air in a direction perpendicular to the rows of individual compartments, but such an arrangement tends to impede airflow, because the solid partitions that separate the first few stalls deflect the airflow away from stalls further downstream. As a result, only those calves in stalls nearest the fans benefit fully from the airflow’s cooling effect. To determine just how much this disparity might adversely affect those calves in stalls farther from the source of the airflow, we compared the immunity levels of a set of calves housed long term at different distances from the airflow source and under different airflow speeds. We also compared the calves’ respiratory rates and rectal temperatures.
机译：单独养育乳制力小牛的做法已成为普遍的普遍性，因为它有助于乳制品农民防止传染病的传播。然而，许多其他健康问题与谷仓的一些内部空间的气流有关，谷仓的一些内部空间被分成单独的档位，尤其是当停顿通过固体隔板分离时。通常，谷仓的通风风扇以沿各个隔室行垂直于行的方向推动空气的方式布置，但是这种布置趋于阻碍气流，因为分离前几个摊位的固体隔板将气流偏转下游进一步摊位。结果，只有最接近球迷的档位中的那些小腿充分利用气流的冷却效果。为了确定这种差距可能对来自气流来源的档位产生不利影响的差距，我们将一组小犊的抗扰度水平与来自气流源的不同距离和不同的气流速度相比。我们还比较了犊牛的呼吸速率和直肠温度。

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