Reducing solar heat and hot summer season, cows stay in closed cow houses, under the pergola, under the shade, and can reduce solar radiant heat by 20% to 30%; designing cowsheds is not only beneficial to winter insulation, but also beneficial to Ventilation and cooling in the summer. The family free-standing households can construct simple shelters according to local conditions to ensure that each cow has a shaded area of ​​3.7 m2 to 5.6 m2. If you use the quail breeding system, please do not leave the cows under the shade. Exposure to the sun for a long period of time. Strengthen convection ventilation in the cowshed to install fans, enhance mechanical ventilation, accelerate air flow, and take away calories from the cow's body, which helps reduce heat stress. The fan is installed at a height of 2 meters from the cow's back. The slope is 20 degrees to 30 degrees from the ground, and the corresponding power is selected. It is advisable to maintain 120 meters to 180 meters per minute above the wind speed of the cattle body. Strengthening environmental greening farms and surrounding greening will not only help to purify the air, but also reduce the environment. Temperature. According to reports, when the temperature in the same area is 27.5°C in summer, the surface temperature of the grass is 22°C to 24.5°C, which is 3°C~6°C lower than that of bare ground. The hot shower can be set by showering the cows. Big drops in a short time The showering effect is the best, specifically the large water droplets are sprayed from the top, each spraying time is 30 seconds, and the rest is 4 minutes and a half minutes. At the same time, the fan is turned on to dry the body surface, taking away body heat is beneficial to cooling, and water droplets can also be avoided. The contaminated breasts are repeated every 5 minutes for 30 minutes. The spraying cycle interval is determined according to the degree of heat stress of the cows. The spraying site is above the food tank (not wet feed), sports ground, waiting area, crowding At the exit of the milk parlour, the sprayed ground is easy to be the cement floor. Adjust the operating procedures to adjust the work schedule properly: advance the time of early feeding, delay the time of late feeding, and extend the time for early feeding and late feeding. It is best to have enough days for the whole night. Food supply. The hot noon should allow the cows to stay in the barn or in the pergola with cooling facilities. Reduce the density of the cows in the area to be squeezed, speed up the milking operation, and reduce the time for the cows to stay in the milking parlor. Adjust the nutritional heat of the diet Insufficiency leads to a decrease in dry matter intake of dairy cows, which can compensate for the nutritional deficiencies caused by decreased feed intake by increasing the nutrient concentration of the unit diet. Usually, energy and protein levels are increased by 10% to 12% in the diet; each day increases. 1 kilogram to 2 kilograms of concentrate but dry feed for concentrate The quality of the content should not exceed 60%; add 0.75% to 1.5% of sodium bicarbonate, 0.35% to 0.4% of magnesia rumen buffer. Add 0.3% potassium chloride, potassium loss caused by increased loss of body fluids. In addition, supplementation Add 300 grams of ruminal fat, but the content of dietary fat should not exceed 6%; supplementary vitamins A, D, E, supplemented by 30 micrograms of organic chromium per kilogram of concentrate, etc. The demand for hot summer cow water increases, Ensure that cows have sufficient, clean, cool drinking water.
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