Cold water spray method for cooling cattle in summer
The summer weather is hot, the cows can't eat, and the milk production drops rapidly. A large number of studies have confirmed that the use of cold water spray method, that is, evaporation and cooling, to reduce heat stress is the most successful and effective. The method not only reduces the temperature of the house, but also increases the milk yield of the cow, and has a good effect on the physiology of the lactating cow and the cow in the late pregnancy.
The main unit sprayed with cold water is a water tank capable of accommodating and maintaining a pressure of 1.4 kg per square centimeter. A hollow metal tube connecting two nozzles is protruded from the water tank, and the distance between them is 25 cm. At a pressure of 1.4 kg per square centimeter, 500 ml of water was sprayed per minute at a water temperature of 24 °C.
Specific method: spray the cow with cold water, spray the water to the body of the cow (except the head) for 5 minutes each time. In order to speed up the heat dissipation and water increase of the cow body, a fan should be placed in front of the cow. The wind speed was 391 cm/sec and the hindquarters wind speed was 226 cm/sec. Spraying is usually done 3 times a day at 9:00, 12:00 and 15:30. In order to achieve good results, the body temperature, heart rate, number of breaths, feed intake and water intake of the cows should be measured before and after spraying. Blood samples should be taken when necessary for comparison.
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