“The disease has always been a concern for fish farmers. In this respect, there are still significant differences between China and foreign countries in advanced aquaculture.” Dr. Shi Xueshi, Pig Technology Consultant, Beijing Office of the American Soybean Association, introduced, Americans use 10 The eradication of swine fever took 20 years to eradicate pseudorabies. This year also eliminated the foot-and-mouth disease. Not only this, the United States also has a better control of circumcision, and China's aquaculture industry is still deeply affected by these categories. Disease problems. The blue ear disease is still the "main problem in the world."

Shi Xueshi pointed out that the complexity of modern livestock and poultry diseases is manifested in mixed infection, the original source of the disease is not easy to be diagnosed, the immune response is abnormal, the frequency of the virus strains is frequent, and the air propagation is significantly increased. This year's piglet diarrhea has shown several aspects of it, through the inspection method to detect the porcine transmissible gastroenteritis virus, epidemic diarrhea virus, rotavirus, up to now, the laboratory has not been able to give the disease Confirmed.

"From a philosophical point of view, the struggle between humans and these diseases will not stop. Although the vaccine plays an important role in the prevention of diseases, the virus has therefore been manually selected and mutated." Shi Xueshi exemplifies the United States. Although the swine fever and pseudorabies have been eliminated, in recent years they have been plagued by newly emerged circopathies and blue-ear diseases. Diseases will continue to accompany farming, and how to prevent and reduce the occurrence of diseases is a method to treat both the symptoms and the diseases. .

He pointed out that pathogens are most likely to breed in a closed and humid environment, and accumulating to a certain concentration will induce livestock and poultry diseases. Good ventilation can effectively reduce the toxic gases in livestock and poultry farms, especially the ammonia produced by the excrement of livestock and poultry, and the high concentration of carbon dioxide produced by metabolism. Combined with drying methods, both can constitute the farm's “best disinfectant”. ".

Ventilation of livestock and poultry houses is often ignored by domestic farming sites as a most effective measure. Shi Xueshi used cow farms as a comparison. Due to good ventilation conditions, the concentration of pathogens cannot be effectively accumulated and increased. Therefore, open or semi-open type There are very few complicated diseases in cattle farms. If livestock and poultry are also kept in this mode, their incidence will be greatly reduced. The outbreak rate of foreign pig diseases is low and the impact is small. Good ventilation and drying measures also play a significant role.

The ventilation of domestic farms still stays at the relatively elementary stage of “opening the windows to ventilate the air”. This not only fails to create a good ventilation airflow, but also results in a situation in which the temperature of the fence is not easily controlled. In the case of low ambient temperatures, diarrhea in piglets occurs when the ventilation curtains are pulled open. Even some pig farms with specialized ventilators do not understand the principle of ventilation. Opening ventilators simultaneously open the windows, causing a "short circuit" in ventilation.

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