How to relieve heat stress
In order to better understand the importance of relieving heat stress in dairy cows, we must first understand the causes of heat stress. The heat stress of cows is due to the adverse effects of heat accumulation on cows, and the cattle farm must take some measures to slow down the accumulation of internal heat. If it's hot, its temperature rises, and the cow's brain and nerve tissue send out instructions to cool it down.
The heat accumulation in cattle comes from two aspects:
First, the main source is the ambient temperature and humidity, which is also an important factor. We say heat stress, but humidity also plays a very important role. Another source is the heat produced by the cow itself, which is directly proportional to milk production. Cows that do not enter the milk production stage such as dry cows, even if the weather is particularly hot, the cattle will not have heat stress, because the body does not produce heat, and the environment has a limited impact on it. Unlike people, cattle hardly sweat! The sweat glands of the cattle are very small. In hot weather, the first manifestation of human beings is sweating, and the heat is evaporated through sweat to cool down. But if the cow does not have this function, it will not sweat.
Stress can reduce milk production by 20%
Dairy cows are different in temperature and sensitivity to environmental temperature. When the cattle have heat stress, temperature rise, and feel uncomfortable, the cow's brain sends out the first instruction to let more blood flow into the skin, exchange heat, and release the heat. If this is not enough to reduce body temperature, the cow begins to breathe, and if not enough, the cow will reduce the feed intake to reduce the heat production of the digestive system. If you eat less, milk production will naturally decline.
For some ranches, if no measures are taken, the milk yield of high-yielding cows may be reduced by 20%, and the pregnancy rate will be reduced by 20%. If the cooling effect is good, the milk yield can only drop by 2%, and the reproduction will be reduced by 10%. If a cow produces 30 kilograms a day, then the difference between 6 kilograms and 0.6 kilograms is not enough to cool down. So by spraying cooling system, a cow can produce 5.4 kilograms of milk a day. The most direct factor of the effect of cooling system is milk yield.
Good cow welfare treatment control heat stress
The effect of heat stress on dairy cows is mainly caused by the decline of milk production and the decrease of fecundity in the two season. In order to alleviate and reduce the harm of heat stress to dairy cows, the most important measures should be taken to improve the welfare of dairy cows and improve the dairy cow feeding technology.
By improving the living environment of dairy cows, the pressure on cows caused by heat is reduced. First, the external heat source should be blocked into the cow house and the sports field, and the heat and water in the cowshed are excommunicated, and the heat of the cow's body heat is promoted through the measures of air supply, water spray and sprinkler. In the place where the air is dirty and not circulated, the cows may be in danger in a short time, or even death. This requires that the cows should be strengthened in the milking area and milking area.
Lick lick magnesium can prevent heat stress
1. the cowshed should be built in good ventilation
Promote the discharge of heat and water in a cowshed. Use insulation materials to build roofs or add ceiling to reduce thermal radiation. Build a shed on the roof of a cowshed, plant seeds, spray water or brush lime to reduce reflection heat and radiant heat.
2. building a simple shed in the dairy farm
The arbor should be 5 meters high. The material of the roof should have good heat insulation and low radiation coefficient. The roof should be inclined to facilitate air circulation.
3. install large ventilating fan and ventilating fan in the house.
It is very important to speed up the flow of gas in the house so as to facilitate the heat dissipation of cattle. The air supply effect is the best in hot season. But at night, the difference between body temperature and temperature is relatively large, which can shorten the air supply time. Generally, the peak temperature of dairy cows occurs in the evening. Therefore, when the temperature is higher than 29 degrees Celsius and the humidity is above 50%, it is necessary to cool down from 5:00 a.m. to 1:00 p.m. In the evening, more cattle lying on the ground can be replaced by position ventilation and air supply.
4. installation of spray device in the house
It is best to install with ventilation devices, spray and send wind energy to significantly promote the heat emission of cattle. But we should pay attention to the time of spraying. If the spray time is too long, the humidity of the cowshed will be too high and the water will be wasted. According to the experiment, spraying once every five minutes, lasting three minutes each time, and equipped with a fan, will make the cowshed temperature than no spraying only fan 1.5 degrees lower.
5. properly planting trees and grass around cowshed and playground
In order to reduce solar radiation, prevent heat entering the cowshed, improve the cowshed microclimate.
6. it is necessary to cool down when the cows are waiting for milking and milking.
When cows walk to the milking area in summer, heat stress increases, and the calorie increases during the milking process, so it is necessary to cool down the two areas and install large power fans, so that a lot of air is blown around the body of the cow.
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