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With the development of the IoT livestock breeding monitoring system , coupled with the continuous expansion of large-scale dairy farms, the combination of livestock breeding monitoring systems with large-scale dairy farming is the only way to accelerate the development of the dairy industry, and its level of feeding management not only directly affects the health of dairy cows. The level is more about food quality and safety and the healthy development of the dairy industry. Therefore, the livestock breeding monitoring system has a very important role in the management of large-scale pasture dairy cows, and to improve the standardization and standardization of breeding.
The coming of summer, the temperature reduction in dairy farms is a key point of attention for breeding, and the use of livestock breeding temperature and humidity monitoring system can well solve the temperature problem in dairy farms.
1. Standards and modes for heatstroke reduction:
In the past, one-sided judgments were: when THI (temperature-humidity index)> 69, respiratory rate greater than> 72 beats / min, and rectal temperature> 39 ° C, cows began to generate heat stress. However, it is not accurate to judge heat stress based on temperature alone. However, it is even more unreasonable to judge cows only based on human self-sensation, because the temperature comfort zone of cows is different from the comfortable temperature comfort zone. Therefore, when measuring the appropriate temperature of dairy cows, big data should be analyzed and combined with practical experience.
The cooling mode of the dairy farm generally adopts the "spray + fan" mode. The main purpose is to accelerate the evaporation of moisture through the fan to take away heat. It is currently the most effective way to prevent heatstroke, especially in southern China.
2. Fan installation requirements:
The wind direction of the fan installation is consistent with the main wind direction, and it is blown in the same direction. Pay special attention to the same wind direction in the milk parlor and the hall to be squeezed. Fan height: bottommost edge 2.25 ~ 2.4m; fan angle: 25 ~ 30 °; fan diameter> 0.9m; maximum interval 6 ~ 7m (2.2-meter diameter fan interval is 10--12 meters is appropriate). The fan should be maintained every year to remove surface dust (before the onset of heat stress). Israeli experts have shown that dust accumulation will reduce the effectiveness of wind speed by more than 40%.
3. Spray installation requirements:
Spray installation requirements for the hall to be squeezed:
Water spray: 500L / h. The spray angle must be correct (360 degrees), there must be no dead angles; sufficient water pressure (a booster pump can be added); there must be no standing water on a suitable slope of the ground.
Spray installation requirements above the neck clip (spread type):
Water spray: 120L / h. The spray angle must be correct (180 degrees); sufficient water pressure (a booster pump can be added); there must be no standing water on the appropriate slope of the ground.
4.Spray opening rules
When the livestock breeding monitoring system detects mild heat stress when THI = 69--73, the fan is turned on; when the livestock breeding monitoring system detects moderate heat stress when THI = 74--79, spraying is turned on. 30-second spray (confirmed based on actual bovine humidity), 5 minute intervals; the livestock breeding monitoring system detected severe heat stress at THI = 80-87, and spraying was started at 24 hours, which means that spraying is still required after work at night.
Summer heatstroke cooling is a continuous task. It is not enough to prevent heatstroke during the day. Heat stress also exists in hot summer evenings, and heatstroke prevention measures are also needed. It is generally recommended to consider using a "spray + fan" system. The main principle is to use the spray system to accelerate air flow and reduce the thermal stress of cattle by reducing the ambient temperature to achieve a more suitable growth environment.
June 12, 2016
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd