Asthma is a common swine disease in winter. Due to repeated onset, the cause is generally not a single infection but a mixed infection. It is a disease that is difficult to cure, and the growth rate of pigs is seriously hindered.
Asthma can only occur in pigs, regardless of age, breed, sex, but the incidence and mortality of piglets are higher, followed by sows, especially pregnant sows. Sick pigs and recessive bacteria pigs are the source of infection. The sick pigs are present in the respiratory tract of sick pigs 1 to 2 years after the clinical symptoms disappear. The pathogens are ejected by coughing and gasping to form droplets. Floating in the air, inhaled by healthy pigs to cause infection. Especially in poorly ventilated, humid and crowded pig houses, the most common disease outbreaks and epidemics. The disease can occur all year round, but when cold, rainy, humid or sudden changes in temperature, the resistance of the pig's respiratory tract is reduced, which can aggravate the symptoms of the sick pig, causing serious secondary infection and increasing mortality. The occurrence and epidemic of the disease are closely related to feeding management. The temperature is too low, the humidity is too high, and the indoor air pollution can seriously affect the control effect of the disease. Therefore, it is recommended to ensure the temperature, control the humidity and keep the indoor air clean when keeping pigs in closed pig houses in winter and spring.
Symptoms have an incubation period of 5 days to 7 days, up to 1 month.
Acute pigs are depressed and breathe faster, 60 to 120 times per minute. I am lying, not willing to move. Abdominal breathing followed, and the two forelimbs were forked and in a canine sitting position. Severe sick pigs breathe and breathe out of the foam from the nose and mouth. Sometimes a continuous to cramping cough is issued. Only a few sick pigs are slightly hot. Appetite is generally normal, and only declines or refuses to eat when breathing is difficult. This type is more common in pigs with new porcine bronchopneumonia, with severe onset, short duration and high mortality. The course of disease died from 1 week to 2 weeks.
Chronic type
The main symptoms are coughing for a long time, especially in the morning when driving up, during the night, during exercise, and after eating. From mild to heavy, in severe cases, continuous coughing. When coughing, arch back, neck and head droop until the secretions in the respiratory tract cough up. Further development, difficulty breathing, abdominal breathing, not eating at the end. Piglets are thin, weak, and slow to develop, causing death if they have secondary infections. The course of disease is 2 months to 3 months, and some are more than half a year. The incidence is high and the mortality rate is low. This type is more common in the old epidemic areas.
[NextPage]Implicit type
Sick pigs generally do not show clinical symptoms, sometimes mild cough and asthma after night or after driving. Growth and development are basically normal.
The main lesions were necropsy in the lungs, lung lymph nodes, and mediastinal lymph nodes. During the development of inflammation, the lungs are inflated with varying degrees of edema and emphysema. When the inflammation dissipates, the connective tissue between the lobules of the lungs proliferates and hardens, the surface subsides, and the surrounding tissue is inflated. The lesions of the lungs are mainly in the anterior border of the heart leaf, the tip leaf, the middle leaf, and the septum. Often interstitial pneumonia changes, bilateral lung lesions are symmetrical. The disease and the health department have obvious boundaries, showing a solid appearance, and the light gray is similar to the pancreas. The cut surface is moist and smooth, and it is a "meat" change. When the condition is aggravated, the color is deepened, which is pale purple, deep purple, grayish white or grayish red. It resembles pancreatic tissue, so it is called pancreas. The hilar lymph nodes and mediastinal lymph nodes are swollen and edematous, white-gray. The cut surface is moist, everted, and the edges are slightly congested.
To purify asthma, you must do the following:
Environmental sanitation, the standard of hygiene is that people enter the pig house and feel very comfortable, warm, and have no ammonia smell.
It is best to grow the fattening house in all directions. Even if it is not possible, it should be cleaned, thoroughly disinfected, and vacant for 7 days to 14 days before being transferred to the pig.
Develop a reasonable immunization program and strictly enforce it, especially for drugs and vaccines.
Regular disinfection, 2 times ~ 3 times a week, you can use Jin Weikang 1:1000, must be clear before the disinfection, the ground, walls, railings should be water droplets.
Regular health care, plus some anti-viral and anti-respiratory drugs, such as Yinqiaosan, Miao Lisu, Zhongwei Fluoride in the feed during weaning transfer (28 days old), reduce stress and enhance resistance. Prevent the invasion of pathogenic microorganisms. The circovirus and Haemophilus parasuis occur at 45 days of age, and can be transferred to the group for drug care, one week.
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