After the summer of 2006, the “pig hyperthermia syndrome†swept across the country caused huge losses to many pig farms and farmers, and it is still full of sorrow. Nowadays, it is the season of midsummer. It is necessary to sum up experience and take effective measures to prevent the recurrence of "pig hyperthermia syndrome".
1 clinical symptoms
The affected pigs have loss of appetite, wilting, lying on the ground, difficulty breathing, and some pigs have symptoms of cough and vomiting. At first, individual pigs quickly spread to the whole group after fever, and the body temperature rose to 39.5 °C ~ 41.5 °C, and the high fever did not retreat, and the individual could rise to 42 °C; the skin of the affected pig was red, and the ear was behind the ear. There are bleeding spots in the skin under the abdomen and the extremities, and some of the pigs have rust-colored bleeding spots on the skin pores of the back; the stool is dry or diarrhea occurs, and some pigs have diarrhea, yellow urine, less turbidity, and darker color. The death process of sick pigs is fast, and many septic changes occur after death. Individual fattening pigs have neurological symptoms before death; some pigs have clear nose, a few noses, sneezing, coughing, and squeezing together; eye secretions increase, Most pigs have tear spots, conjunctivitis symptoms; vomiting, diarrhea and other gastrointestinal reactions, hind limb weakness, walking and swinging. The incidence rate of most sick pig farms is more than 50%, and some farm farm mortality rates are as high as 50% to 90%. In some late pregnancy, sows have miscarriage, producing stillbirth, weak and mummified fetuses, and during or after childbirth. Three-day sows also have morbidity.
2 pathological changes
There is a fibrinous slurry in the pleural cavity. Individual pig lung membranes form a fibrinous adhesion with the pleura or pericardium; the lungs are enlarged, the interstitial lungs are thickened, and the lungs of individual pigs are atrophied and rubbery; lymph nodes are enlarged, especially the inguinal lymph nodes and lungs. Portal lymph nodes; some livers are yellowish, with gray-yellow necrosis; gallbladder enlargement, bile filling, individual visible biliary dryness; spleen slightly swollen, hemorrhagic papules; kidney enlargement, bleeding spots on the surface or continuous Blood spots, necrosis; individual pig bladder, throat, coronary coronal fat and endocardial membrane have bleeding points; stomach, intestinal mucosa catarrhal inflammation, which is the most obvious congestive inflammation in the stomach at the bottom of the stomach.
3 main pathogens
The current research shows that the pig disease is blue ear disease (the result of the Ministry of Agriculture is caused by highly pathogenic blue ear disease variant strain), swine fever, secondary pseudorabies, streptococcus type II, pig Infectious pleuropneumonia, Haemophilus parasuis, pig lung disease, toxoplasmosis, erythropoiesis and other diseases, the pathogens involved in mixed infections in different places are not exactly the same.
4 The main cause of the disease
4.1 There are different degrees of immunosuppressive pathogens such as circovirus and blue ear virus in the diseased pigs. Under heat stress conditions in summer, the resistance of pigs is reduced, and the disease takes place. In particular, the free-range households and pig farms that have been used for the fattening of piglets have a high stress response and are highly susceptible to high fever in the herd.
4.2 Environmental factors: high temperature in summer, high humidity, pathogens, viruses, bacteria, parasites, etc., rapid reproduction, strong invasiveness, combined with bites of blood-sucking insects, mosquitoes, etc., easily lead to diseases in pig farms with poor housing conditions Occurrence and popularity.
4.3 Some pig farms cannot sample and test the diseased pigs in time, analyze their pathogens, and some rely on experience to judge whether they are toxoplasmosis or erythropoiesis, and they have insufficient understanding of the complexity of pathogens. The cause of the nameless hyperthermia syndrome pigs adopt "single treatment", which often results in poor efficacy, which causes the spread of the disease.
4.4 The price of pigs has fallen sharply, causing many pig farmers to suffer serious losses, insufficient feeding costs, feeding with poor quality feeds, reducing the physical condition of pigs, coupled with high temperature and high humidity weather conditions, directly inducing more At the same time, the fall in pig prices has made people invest insufficiently in epidemic prevention and health care. The vaccine has not been hit, which is the main reason.
4.5 In summer, high temperature and high humidity, the feed is prone to mildew and produce mycotoxins. When the pigs ingest the feed with excessive mycotoxin, the immune function and resistance are reduced. The antibody level after immunization is still low, and it is difficult to prevent various diseases. happened.
4.6 Human factors: Many pig farmers vaccinate or treat diseases. A group of pigs often use only one needle, which can easily cause the whole disease.
5 comprehensive control measures
5.1 Precautionary measures: 1 Strictly follow the epidemic prevention system to carefully manage the personnel and reduce the number of times the self-employed personnel enter and leave the farm. It is strictly forbidden to buy pigs and vehicles to enter the farm. 2 Do a good job of disinfection and source elimination, strictly follow the disinfection procedures of cleaning, washing, disinfecting, drying, and transferring, and carefully disinfect the empty pig house; at the same time, regularly use the pig house corridor, aisle and open space. 2% ~ 3% of caustic soda water disinfection, if necessary, disinfection of pigs with harmless pigs with pig spray disinfection, regular rodenticides, prevent cats and dogs from shaking in the pig house. 3 Do a good job in immunizing diseases such as swine fever, blue ear disease, pseudorabies, and gasp disease, which are harmful to the pigs. It is necessary to have a needle for a pig to avoid cross-infection and reduce the chance of transmission of pathogens. 4 It is necessary to pay close attention to the epidemic situation around the pig farm. It is necessary to collect serum regularly and do a good job in monitoring the disease to master the disease dynamics. At the same time, according to the level of antibody monitoring, the immune program is adjusted to ensure the immune effect. 5 Do a good job in drug prevention and deworming health care. After 2 weeks of weaning pigs, we will conduct deworming in and out of the body and prevent respiratory diseases in advance to control the occurrence and spread of respiratory diseases in the nursery and growth period. 6 It is necessary to do a good job in the daily inspection of the quality of stocked feed. It is absolutely impossible to use the moldy and finished raw materials. In the summer, the mycotoxin treatment agent should be added to the pig feed to control the mycotoxin in the feed. 7 It is best to buy from the same farm once at the time of introduction. Before entering the pig, be sure to clean and disinfect the pig house. After entering the pig, disinfect the pig twice a week.
5.2 Therapeutic measures: For the pigs after the onset, add the drugs that are effective against bacteria and viruses in the feed, and add the medicine in the drinking water, let the pigs drink freely for 5 to 7 days, and use the astragalus polysaccharides together. , interferon, ceftiofur and other drugs for prevention and treatment, clinical application is better.
After the onset of the herd, the use of Bupleurum + Banlangen + Anjibilin + Cephalosporin + Dexamethasone for high fever and dyspnea can be combined with kanamycin + amikacin twice a day. Three days, or when the pigs have severe fever, add aspirin 200 ~ 250 mg / kg or An Nai near drinking water; if the pig group is infected with toxoplasma, you can add some sulfonamides; conditional can also be used in each Add 3 to 4 kg of Chinese herbal medicines such as Yinqiao, Houttuynia or Radix Isatidis.
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