Causes and prevention measures of "high fever" in summer pigs

Pig "high fever" is actually an infectious disease caused by a variety of bacteria and pathogen infections. Because the pig's subcutaneous fat is thicker, the body's heat dissipation is poor, and the stress response to high temperature is strong. Therefore, hot infectious diseases are prone to occur in summer. Today we are going to learn the specific symptoms and treatment principles of summer pig "high fever".

夏季猪“高热病”的发病原因和防治措施

1 Analysis of the causes of "high fever" in pigs

At present, the cause of the disease is many. First, the incidence of decentralized farming is high. Some large-scale pig farms and free-range pig farmers are not in place to implement various epidemic prevention measures, bio-safety measures are not perfect, sanitation cleaning work is not in place, and environmental pollution index is not good. The second is seasonal problems; rainy seasons, high temperatures or humidity, mosquito bites, poor management, and relatively high incidence. At the same time, if the temperature is high, so that the density of the pig house is high, it is difficult to control, thereby increasing the probability of infection of the disease. Third, the vaccine itself has insufficient antigen content. The amount of antigen will affect the immune effect of the vaccine. If the antigen is insufficient, it will not work well. All vaccines have a prescribed expiration date. Depending on the temperature at which they are stored, the time is different, so there may be a phenomenon in which the vaccine expires, and thus it is not discovered in time. At present, simple bacterial infectious diseases are less and less controllable, but due to conditional infections, resistant strains are produced, which aggravates the spread of the disease.

2 specific symptoms of pig "high fever" disease

Sick pigs continue to have high fever, body temperature 41 ~ 42 ° C, varying degrees of skin redness, finger pressure subsided, depression, love lying, old sleep, anorexia, a small amount of drinking water, lethargy, yellow stool, globular; skin redness, abdomen and limbs Multiple purple spots. The degree of lymphadenopathy on the surface of the body is different, and mucosal erosion can be seen. Some pigs have obvious respiratory symptoms, and even have difficulty breathing, asthma, and shortness of breath. Most are nursery pigs, fat pigs and sows. The mortality rate is 30% to 50%, 20% to 40%, and 10%, respectively. At first, hair disease was more than 3 to 4 days, and even spread to the entire group. The general period of the disease is longer, more than 5 to 7 days.

夏季猪“高热病”的发病原因和防治措施

3 clinical symptoms

The clinical symptoms of sick pigs are characterized by severe bleeding and interstitial pneumonia. Pleural effusion, pericardial effusion, coronary coronal sulcus have a gelatinous lesion, and the liver surface is covered with scattered round white membrane; some of the kidney is swollen, yellow-green, and the surface of the kidney is needle-like granule blood. Systemic lymphadenal hemorrhage, digestive tract and genitourinary tract bleeding; gastric mucosal exfoliative ulcer.

4 Principles for the treatment of "high fever" in pigs

4.1 early detection, early diagnosis, early treatment,

At any time, an outbreak was observed in the surrounding area. Once an outbreak occurs, the scene is immediately blocked, personnel and vehicles are prohibited from entering and exiting, the immune system is strengthened, and medical measures are taken to prevent the disease. Once the disease occurs, in accordance with the principle of “early, fast, strict, and small”, the epidemic will be eliminated promptly and quickly to prevent the spread of the epidemic. Due to the long duration of the disease, the corresponding drug should be applied within the first 3 to 5 days, and the drug should be reduced a little in 5-7 days. The treatment process is sufficient, generally no less than 5 days to prevent recurrence. Because it is a mixed infection, the pathogen type is different, the clinical manifestations are different, and the symptomatic medication is taken.

4.2 drug selection

To do a good job in pig health, do not use antibiotics in the absence of infectious diseases, promote the use of probiotics; in the case of infectious diseases, combined with disinfectants for pig and pig house medicine, but do not use antibiotics for a long time. Prevent secondary infections.

Sensitive, highly effective, and low-toxic drugs should be selected. Antibiotics include ceftiofur sodium, lincomycin, azithromycin, doxycycline, long-acting oxytetracycline, ofloxacin, amoxicillin, sulfamethoxymethane, and the like. Antiviral drugs: interferon, immunoglobulin, astragalus polysaccharide, Banlangen, Shuanghuanglian, Houttuynia and so on. Antiviral Chinese medicine preparations combined with antibiotics to treat high fever. At present, Huang's polysaccharide injection is widely used in the combined application of tilmicosin, lincomycin or ceftiofur sodium. Antipyretic analgesics and hormonal drugs can also be used as appropriate, but the dosage and course of treatment must be properly controlled and should not be used in large doses.

4.3 use of regular vaccine

Imported vaccines must be purchased from official sources. The manufacturer must be approved by the Chinese veterinary drug supervision and administration department. Imported vaccines must be inspected and registered and available for sale and use. Avoid using unapproved pilot products.

4.4 combination of drug treatment and feeding management

Eat less, drink plenty of water, and feed some digestible green feed. Adding glucose and electrolysis to drinking water, especially VB1, VB12, VC, VE, VA, etc.; increasing the amount of anti-stress drugs such as vitamins, and minimizing the chance of diseases caused by stress-induced decline in pig resistance. Post-management focuses on regulating the gastrointestinal tract and promoting appetite.

夏季猪“高热病”的发病原因和防治措施

4.5 Increase management system and strict disinfection

The pig farm is equipped with high-powered fans to increase cooling measures such as ventilation and cooling water spray on the farm to promote convection evaporation and heat dissipation. To build a small shed on the outdoor playground of the breeding farm, use a shade net and use cold water. Rinse the pig's body and add a spray at high temperatures. The spray device is sprayed 4 to 6 times a day. The water curtain cooling system can be installed conditionally, and the general temperature can be reduced by about 5 °C. We should do a good job of greening around the pig house. Planting trees can effectively regulate the microclimate environment and effectively reduce the ambient temperature. All personnel, logistics and vehicles entering the site are disinfected and visited according to the prescribed route. Pig houses and utensils are disinfected regularly

4.6 Scientific development of immunization procedures

A scientific and rational immunization program has been formulated, which fully considers the pig's age, feeding management level, maternal antibody level, vaccine characteristics, and strengthens the intensity of vaccination. Strengthen supervision. In order to enhance immunity, vaccines must be boosted to enhance disease resistance in animals.

The above method is very suitable for large farms. According to clinical experience, the cure rate is 60% to 70%. The above is a personal point of view. The situation in each pig farm is different. Judgment should be based on different situations. for reference only. The treatment of swine disease is a dialectical process, and the medication plan is not static. According to the age, weight and severity of the pig, it should be flexibly adjusted and used reasonably to achieve better therapeutic effect and minimize the occurrence of disease.

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