Heat stress symptoms and Prevention measures of Dairy cows

When the cow is cold-tolerant but afraid of heat, the high temperature causes its body temperature imbalance and causes heat stress reaction. heat stress does great harm to dairy cows, not only affecting milk production. It is also easy to lead to the decline of cow resistance and easily lead to disease. But many people do not know much about its heat stress, do not know its symptoms and prevention measures, let's take a look at the pro-agricultural network.

1. Symptoms of heat stress

When heat stress reaction occurs in dairy cows, the clinical symptoms are obvious increase in body temperature, loss of appetite, shortness of breath, rapid heartbeat, abnormal metabolism and decreased body function. In addition, it is also very harmful to cows, when heat stress occurs, female cows will secrete more progesterone, so that female cows have abnormal estrus or stop estrus, and reduce the pregnancy rate. And pregnant female cows are also prone to miscarriage and stillbirth.

2. Discriminant method

We can also use some methods to determine whether the cow has heat stress response, such as measuring the humidity and temperature of the feeding environment, body temperature, pulse and respiration, and so on.

The dry and wet temperature of the feeding environment: we can install a dry and wet thermometer in the barn according to the area of the barn, but when the temperature of the barn is higher than 30 degrees and the humidity is higher than 70%, the cows will have slight heat stress; when the temperature in the barn is as high as 35 degrees. When the humidity is higher than 75%, the cows will have moderate heat stress; when the temperature in the house is as high as 40 degrees and the humidity is higher than 80%, the cows will have severe heat stress.

Body temperature discrimination method: under normal circumstances, the body temperature of dairy cows is about 38.5 degrees. 10 dairy cows are randomly selected and their body temperature is measured. If the average body temperature is higher than 39 degrees, it indicates that there is heat stress, while if the average body temperature exceeds 40 degrees, it shows that the heat stress reaction is extremely serious.

Pulse discrimination method: in general, the pulse of dairy cows is 40-80 beats per minute, the same random sampling, if the average pulse is higher than 80, indicating that there is heat stress, but higher than 85, indicating that heat stress is more serious.

Breath discrimination: under normal circumstances, dairy cows breathe about 30 times per minute, random sampling test, if the average is more than 30 times, indicating that there is heat stress, and more than 40 times, indicating that heat stress is more serious.

3. prevention and control measures

The first thing to do is to lower the temperature of the barn, build an Arbor or plant trees around the barn to avoid direct sunlight. Strengthen feeding management, heat stress when the cow appetite is not good, so according to the change of temperature to feed, try to choose in the morning and evening temperature is relatively low time to feed, avoid high temperature period, feeding should add the proportion of fine feeding, supplement nutrition. When dairy cows are under heat stress, the amount of drinking water is several times higher than usual, insufficient drinking water will cause a series of hazards, so it is necessary to improve adequate and clean drinking water, the drinking water temperature should be lower than 10 degrees.

The above are the cow heat stress symptoms and prevention measures brought by the pro-agricultural network. I believe we all know about the symptoms and prevention measures of dairy cow heat stress. If you want to know more, please pay attention to the pro-agricultural network.