The harm of influenza virus should not be ignored during pregnancy.

Bovine influenza is an acute febrile infectious disease, which has the characteristics of strong transmission, rapid spread, rapid development and violent coming. As long as one of the cattle is infected, it will make most cattle infected in a short time, especially in the climate drastic change, the spring and autumn season with large fluctuations in cold and heat is more obvious, and the incidence is high. The barn is unhygienic, cold and damp, and the feeding management can not keep up with it. When the cattle are excited by the wind or drinking cold water, it is more likely to induce influenza when the cattle's resistance decreases. According to statistics, during the influenza epidemic in winter and spring in Muling City, Heilongjiang Province, the incidence of dairy cows is as high as 15.32%, and that of yellow cattle is only 4.52%. The incidence of dairy cattle is more than 11% higher than that of yellow cattle. The incidence of influenza in pregnant cattle accounts for about 60% to 70%, which is not only harmful to pregnant cattle themselves, but also seriously affects the growth, development and safety of fetuses, causing more harm and can not be ignored.

Causes of Influenza in pregnant cattle

The pathogen of bovine influenza is a viral virus, which mainly exists in the respiratory secretions of diseased cattle and infected cattle. The virus is transmitted through air and droplets and is transmitted by respiration, often infecting the whole population in 2-3 days. The virus invades the cow and causes fever, which is caused by the heat generated by the metabolism of the cow, which is emitted by sweating, breathing and urination. Due to the increase in heat production after fever, accelerated metabolism, less heat, skin vasoconstriction, reduced sweat secretion, sick cattle fever, dry nose, dry mouth, this is the truth. With the continuous accumulation of heat in the body, the body temperature increases, which leads to a series of pathological processes of functional metabolic changes in cattle. Although influenza virus can infect cattle of different ages, genders and breeds, cows after pregnancy are more likely to be infected and cause disease. This is because the immune function of pregnant cattle decreases during pregnancy and the ability to resist the invasion of foreign viruses decreases, which weakens the physique of cows, which is why cows are more likely to catch colds than other cows during pregnancy.

Harmful effects of influenza on fetus

After pregnant cows catch a cold, the harm to the fetus mainly comes from two aspects: one is the direct influence of the virus, and the other is the indirect influence of high fever caused by cold and toxins caused by metabolic disorders. In the early stage of pregnancy, because the development of various organs of the fetus is not perfect, once the cow catches a cold, the virus can affect the development of fetal organs through the placenta, especially in the process of the formation of the fetal cardiovascular system, the virus can cause the fetus to suffer from congenital heart disease. even lead to hydrocephalus and brain deformities, seriously affecting the lifelong health of the fetus. Influenza can also cause high fever and toxin, the metabolite of the virus, stimulate the uterus, make it contract, cause abortion or premature birth, etc.; after influenza, if it is not controlled, it can also be secondary to tracheitis, pneumonia, etc., aggravating the disease and increasing mortality, thus bringing serious economic losses, which must be taken seriously.

Early Prevention of pregnant Bovine Influenza

In view of the many effects of influenza virus on the fetus, the prevention of influenza in pregnant cattle should be emphasized, and nutrition should be strengthened to increase the resistance of pregnant cattle. In the cold epidemic period, it is necessary to increase disinfection efforts, often with bacteria and viruses can kill the enemy, Nongfu, Baidu and other new drugs disinfection. The barn should keep warm, prevent the cattle from catching cold, do not come into contact with susceptible animals, lay bedding grass frequently, maintain a hygienic, dry, non-humid and well-ventilated living environment, and pay attention to let the cattle rest and keep them have enough sleep time to improve their immunity.

Before the cold epidemic season, where there are conditions, if inactivated oil vaccines can be made from local isolated strains of bovine influenza, and cattle can be vaccinated, immune protection against bovine influenza can be obtained, which is the most effective. Even in epidemic areas, cattle without disease can be fed with traditional Chinese medicine Guanzhong 400g, fried soup once a day for 3 days, 45 grams each of Guanzhong, Schizonepeta tenuifolia and perilla, and 30 grams of hay soup, one dose a day for 3 days; or 1000 mg of amantadine hydrochloride, mixed twice a day for 5 days, has a certain preventive effect on bovine influenza.