The suitable temperature for the growth of dairy cows is 16°C-23°C and 15°C-20°C for high-yielding dairy cows. When the temperature exceeds 25°C, the cow's milk production decreases significantly. According to statistics, puerperal dairy cows' milk production in August was 12.5% ​​lower than that in January-February. In order to reduce the impact of high summer temperatures on dairy cows, the following points should be taken into consideration.
To improve the environment, take a arbor on the sports ground. The length of the arbor is appropriate from north to south, 3-4 meters high and 5-8 meters wide. The materials used should have good thermal insulation properties. It is better to install ventilation facilities or electric fans in the cowshed to accelerate the heat dissipation of the cattle body, and to use water spray in combination with a fan. Conditional cattle farms can install spray equipment in the cowhouse and extend the spray cooling time to reduce the surface temperature of the cattle body. Flushing the ground with tap water can also cool the cow house.
Strengthening the reduction in nutrient intake is an important factor that causes dairy cows to reduce milk production in summer. The palatability of dairy cows' summer diets should be improved, and the energy and protein levels of the diets should be appropriately increased. The supply of minerals and vitamins should also be adjusted. In general, the crude protein and net milk production energy of dairy cattle mixed concentrates should reach 20%-21% and 6.3 MJ/kg, and the ratio of lysine to methionine in the diet is 3:1. In addition, about 6% of ruminal fat can be added to the diet, and the neutral detergent fiber content in dairy cows' summer diet should be controlled at 28%-32%.
Scientific Feeding Feeding methods should appropriately increase the number of feedings, using night feeding (4-5 o'clock in the morning or after 10 o'clock in the evening) and feeding porridge. At the same time, the stadium should have sufficient fresh water to ensure that the cows drink water.
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