1. Widely spread
Due to the various transmission modes of the pathogen, it can be transmitted not only vertically through eggs, but also horizontally through respiratory tract. There are many transmission media, such as feed, vehicles, utensils, clothes, shoes, and micro particles in the air, which can spread the disease. It can be said that it is impossible to prevent, resulting in different degrees of infection in most chicken farms.
2. The retention time of pathogens is long
Chickens infected vertically by eggs usually get sick within one week old. The incubation period of natural contact infection is about 10 days, but when the management environment is good, the incubation period will be as long as several months. The pathogen is latent for a long time. Once the chickens are stimulated by bad factors or the environmental conditions are suddenly bad, they will get sick quickly. Damp, cold, poor ventilation, improper operation of vaccine immunization and improper operation of population transfer can induce and aggravate the disease.
3. The number of chicken farms is increasing
The prevalence of Mycoplasma synovialis indicates that the contamination of pathogens is becoming more and more serious. At present, the prevention and control of Mycoplasma synovialis is not successful, so it is necessary to adjust the thinking.
4. Great harm
The cause of the disease is that some chickens are stunted, which affects the evenness of the flock. If the elimination rate is not increased, the egg production peak may be delayed. Chicken infected with the disease, the body resistance decreased, it is easy to occur mixed infection with E. coli, resulting in increased mortality and increased difficulty in treatment. The hatchability of eggs infected by Mycoplasma synovialis decreased by 8% - 10%, and the weak chick rate of chicks increased significantly. The disease can also reduce the immune effect of other vaccines, seriously affect the hematopoietic function of bone marrow and can not effectively produce antibodies after vaccination, resulting in poor immune effect and even immune failure. In the early stage of the disease, there is no focus of recessive infection, which is not easy to be found. Once the disease occurs, it will seriously affect the normal growth and development of the body and the quality of eggs and eggshells in the later stage.