Prevention and control of autumn respiratory syndrome in large-scale pig farms

In the autumn, the temperature difference between day and night is getting bigger and bigger, and at the end of autumn and winter, if the closure is not timely or the operation is not proper, it is easy to cause the occurrence of respiratory syndrome in large-scale pig farm growth and fattening pigs; Poor, relatively poor air quality and high ammonia smell are also major causes of the disease. Respiratory syndrome causes loss and harm to large-scale pigs as much as other major infectious diseases. To this end, the prevention and control of respiratory syndrome in large-scale pig farms in autumn and winter has become the focus of preventive drug use. Incidence

The swine disease is the common bacteria in most pig farms in the world. Generally, the performance is not obvious when the environment is suitable, and the damage caused by the pigs is also reduced with the increase of management level. The herd is afflicted by factors such as transportation fatigue, physical decline, environmental changes, poor housing, poor ventilation and sanitary conditions, and poor management of feeding. After the clinical symptoms of the recovered pigs disappear, the healthy pigs are continuously sterilized for a long time.

Pigs of different ages, genders and breeds can occur in this disease. The autumn and cold winter with large temperature difference between day and night is a high incidence period of the disease. Poor feeding management and sanitary conditions such as mildew and deterioration of feed, dampness, crowding, poor ventilation, etc. may occur when the resistance of pigs is reduced. Seriously affect the growth and development of the herd. If other diseases (porcine lung disease, swine flu, Haemophilus parasuis, swine fever, etc.) are secondary, the condition will be aggravated, which will cause serious death. Clinical symptoms

The main features are cough, asthma and breathing, body temperature is generally not high, appetite is good and bad, growth and development is slow. The acute case has a disease course of 7 days to 10 days, and the chronic case is 1 month to 2 months.

Acute symptoms: acute onset, difficulty breathing, breathing 60 times / min ~ 120 beats / min, breathing when breathing, the wheezing sound like pulling the bellows, there is obvious abdominal breathing, sometimes in a dog sitting posture, normal body temperature The mortality rate is high, and the course of disease is about one week. For example, the body temperature rises after other diseases. This type is more common in the early stage of the epidemic or the initial onset of new farms. It is rare for this type of disease to occur in fattening pigs with a clinical weight of more than 30 kg.

Chronic symptoms: Sick pigs show long-term cough and wheezing, the most obvious cough in the morning, and more common during nighttime eating and after exercise. When standing cough, standing still, arching back, neck stretching, head drooping, coughing many times, in sputum After coughing, the recumbent showed obvious abdominal breathing. The course of disease is long, and it can last for about one month. Under good feeding and management conditions, the fattening fertilizer can be released, but the feed utilization rate is reduced by 20%. Some piglets are gradually losing weight, and the growth and development are stagnant to form a stiff pig.

Harm of respiratory syndrome

If the respiratory syndrome is not effectively controlled in a short period of time, it can be followed by a variety of diseases in the herd, resulting in greater economic loss, and once it has evolved into a meaty change from the initial inflammation of the bronchus or lung without organic disease. A large number of irreversible organic lesions (such as large defects in intratracheal cilia, lung pancreas, lung necrosis or massive cellulose exudation in the chest) will eventually be difficult to cure, resulting in relief of symptoms when injected or mixed. But once the drug is stopped, it will rebound immediately. In pigs that cause organic lesions in practice, if they are infected with other infectious diseases such as influenza and swine fever, their low-functioning respiratory system will further increase the mortality rate and aggravate the disease.

Pig disease prevention

Strengthen management to improve the level of feeding management, comprehensive nutrition configuration, pay attention to the reasonable regulation of ventilation and heat preservation.

Drug prevention (1) Add 1 kg of feed (mainly tilmicosin, azithromycin) 600 g or fluoride channel (main component 20% florfenicol) 600 g, 7 days a month. (2) Add 1 kg of intestinal strength (mainly Bacillus subtilis) to 1 ton of feed. Adjust the intestinal flora of the pigs, increase the utilization of protein in the feed, reduce the production of ammonia in the house, and improve the air quality in the house.

Drug-treated pigs can be injected with cephalosporin pioneer or ceftiofur sodium or flufenacetamide (mainly florfenicol, tiamulin) or bloodthirsty collateral (mainly florfenicol), focusing on At the same time of individual treatment, 600 grams of sputum and 600 grams of fluoride were added to 1 ton of feed. It should be noted that in the treatment of respiratory diseases, pigs with severe asthma should not be chased by the pigs when they are injecting, which is very likely to cause pigs to suffocate and die.