Prevention of Pig Unnamed Hyperthermia Syndrome

“Pig noname fever” means pig hyperthermia syndrome. It is a disease with high morbidity and mortality. It mainly occurs in pigs in breeding period and part of sows. The main clinical manifestations of pigs are elevated body temperature, depressed spirit, appetite. Weakness or waste, breathing difficulties, gasping, some pigs with red and purple skin and other symptoms, a few pores have bleeding points. The pathogens are mainly mixed infections and secondary infections of various viruses and bacteria, parasites, including swine fever virus (HCV), porcine reproductive and respiratory syndrome virus (PRRSV), swine influenza virus (SIV), and pseudorabies virus (ADV). ), Porcine Circovirus Type 2 (PCV-II) and Actinobacillus pleuropneumoniae (APP), Streptococcus suis Type 2 (SS-II), Haemophilus Parasuis Disease (HP), Multiplex Kill Co-infection of bacteria such as PM, Mycoplasma hyopneumoniae (MH), toxoplasma, Eperythrozoon, Salmonella choleraesuis (SC).

Due to the complex etiology of the disease, it is usually a mixed infection with multiple pathogens, which is difficult to control clinically. The treatment effect is often unsatisfactory, resulting in slow growth or stagnation of pigs, increased numbers of sick and dead pigs, feed efficiency, growth rate, and pigs. The overall uniformity of the group was reduced, the treatment cost increased, and the pig production suffered serious losses.

First, the characteristics of the disease

1. Occurs in seasons with high temperatures, long duration, usually around 5 to 20 days, with a high mortality rate.

2. The pig farms do not attach importance to epidemic prevention work, technicians have poor health care concepts, and pig farms that have not strictly closed pig farms and do not have systematic health care for pigs have a serious outbreak.

3. The weight of the affected pigs is generally between 20 and 80 kg. The incidence rate is the highest. There are also piglets after weaning.

4. The effect of drug treatment is not ideal, and the mortality rate of farms that use drugs indiscriminately is higher.

Second, the clinical symptoms

The body temperature of the affected pig rose to 40 to 42.5°C, and the spirit was depressed, and the feed intake decreased or the appetite was abolished. The red skin of the affected pigs, the blisters on the ear of the ear, the lower abdomen and the limbs of the extremities and other parts of the body were patchy. Violet red; Breathing difficulties, hi bed, some pigs have severe abdominal breathing, shortness of breath, some performance of gasping or irregular breathing; some suffering from pig runny nose, sneezing, cough, eye discharge increased, large Some pigs had tear spots and symptoms of conjunctivitis; some pigs had constipation, constipation, globular, urine yellow and less, turbidity, and darkening. The sick pig with a longer course of disease was pale, with anemia, coarse hair, and some pigs with hind limbs. Some of the sick pigs could not stand until they died. Finally, the whole body convulsed and died. The mortality rate of the affected pigs is very high, and some pig farms even reach 50-90%. Some sows in the late pregnancy (100 to 110 days) abortion, stillbirth, weak and mummy.

Third, the necropsy changes

All sick pigs had different degrees of pneumonia. The following symptoms were observed in the autopsy:

1. Pulmonary swelling, hardened; rubbery lung with inability to contract, interstitial pneumonia with obvious symptoms, mottled to brown lesions in the lungs (marble-like); most are mixed infection pneumonia, purulent lesions, some pigs Pulmonary hemorrhage, hemorrhagic pneumonia, and interstitial substance were significantly wider.

2. Wide-spread lymph nodes, especially inguinal lymph nodes and hilar lymph nodes.

3. Some dead pigs had swollen livers and pale in color. Some livers were loess-colored and brittle. Individual pig kidneys, bladders, larynx, heart coronary sulcus fat, and epicardial and epicardium had bleeding points; some dead pig kidneys Large, darker in color, brownish or khaki, brittle texture, with blood stasis. Some pigs have enlarged spleens and are brittle.

4. Multiple serous cellulose pleurisy and peritonitis, fibrin exudation in the chest and abdominal cavity. Individual swine lung pulps adhered to the pleural or pericardial cellulose.

Fourth, control measures

The cause of the disease is complicated, and the sick pigs generally suffer from poor health. Prevention and treatment should be based on prevention. Through strengthening the management of feeding, doing a good job in prevention and cooling of the heat, advancing health care prevention, strengthening disinfection work, symptomatic treatment and other measures to reduce the incidence and death. rate.

1. Adhere to the principle of self-cultivation and self-cultivation to prevent the purchase of potentially infected pigs.

2. Pay attention to the feeding and management of pigs and minimize various stress factors:

1 Summer should be done to prevent heatstroke, increase the ventilation of the pig house and use cool water spray and other cooling measures to promote evaporation and heat dissipation through convection; pigs' doors and windows should be fully opened to allow air convection. When the temperature is high, wash the pig body with cold water or install a spray device. Spray 4 to 6 times a day.

2 The breeding density should be reduced in the summer. Growing pigs should have more than 0.8 square meters of living space. The best breeding room is 1.2 square meters per head. The best number of pigs in each column is 10 to 12 heads, and the reasonable stocking density should be maintained. Cooling can effectively control the pig's nameless fever and respiratory disease.

3 Adopt strictly all-in, all-out feeding methods from birth, childcare, and bred, avoiding feeding pigs that differ greatly in age, and reducing the number of times that the pigs are transferred or mixed to achieve the same pigs. The herds were all transferred out at the same time. After each batch of pigs were slaughtered, the pighouses must be washed and disinfected. After a few days of vacancy, they were transferred to new herds.

3. The pig house and the environment need to be regularly sterilized to reduce the content of pathogenic microorganisms.

Because the virus is not sensitive to ordinary disinfectants, especially porcine circovirus, the general disinfectant does not work for it. When disinfecting, new and less irritating disinfectants should be selected, such as compound aldehyde disinfectant, in the onset of 10 Within days, the concentration of the disinfectant should be increased, and the external environment near the epidemic area and the epidemic area should be strictly disinfected 4 to 6 times a day. Sows and large and medium-sized pigs can be spray-disinfected at noon with pigs (with pigs). The area is sterilized once a day. Starting from the 10th day, it can be doubled and diluted to reduce the chance of healthy pigs passing the respiratory infections such as influenza, to prevent the spread of the disease, and to play a good effect in controlling the spread of the disease.

4. Drug control measures:

The disease focuses on prevention. When the herd is affected on a large scale, the therapeutic effect is generally not satisfactory. Antibiotics should be added to the feed or drinking water before the outbreak of the epidemic occurs. Prevention should be done before the peak of pig fever without fever. When the epidemic occurs, antibacterial treatment against bacteria and mycoplasma can reduce the loss and measures should be taken as soon as possible. Simultaneous administration of water and feed, combined with injections to treat sick pigs to reduce the death caused by secondary bacterial infections. At present, the clinically more sensitive drugs in pig farms have nets, etc. The pig farms can use the method of combined medication according to the situation on the farm and formulate preventive health care plans for the farm. The control of the source of bacterial diseases begins with medication and care for sows.

1 pairs of pigs that have had "pig unnamed and high fever": fluoxacillin + sulfamonomethoxine 300g/t can be added per ton of feed; because the affected pigs have reduced feed intake, they can't get enough treatment The quantity of the drug should be added to the drinking water at the same time, and a combination of antibiotics and herbal extracts that are effective against both bacteria and viruses should be used to allow the pigs to freely drink for 5 to 7 days. Pigs that have already developed should be isolated and bred, carefully cared for, and treated with astragalus polysaccharides and long-acting sulfamethoxazole injections. They should be used twice a day for 3 to 5 days. At the same time, drugs should be added to drinking water for treatment. If infected pigs are infected with viral diseases such as swine fever, the therapeutic effect is poor. Diseased pigs with particularly severe disease and poor treatment effect should be eliminated promptly and decisively to prevent the spread of the disease.

2 Growth and development period: 12 to 13 weeks of age and 17 to 18 weeks of age to use effective drugs for prevention, can be added to the feed per ton of floroxylline + doxycycline 250 grams, soluble antibiotics can also be added in drinking water Using pulsed administration for 1 week, 1 week after drug withdrawal, 1 week after drug administration.

3 In hot and hot weather or when pigs are transferred or injected with vaccines, anti-stress drugs such as multidimensional electrolytes should be added to drinking water to minimize the chance of stress-induced decline in herd immunity.

4 Lactating sows: Antibiotics can be added to the sows 1 week before and after the sow, adding florfenicol + Lomefloxacin 1000g per ton of feed for prevention; or using 80% of the original net 125g / Ton + chlortetracycline 300 g / ton + amoxicillin 150 g / ton to add, reduce the sow out of the bacteria contamination of the sow house, cut off the level of disease transmission from sows to piglets.

5 Weaned piglets: Antibiotics are added to piglets from 1 week before weaning to 4 weeks after weaning, adding floroxysonline + doxycycline 200g/ton per ton of feed, or using 80% of the original net 125g/ton. Ton + chlortetracycline 300 g/ton + amoxicillin 200 g/ton cut off the horizontal transmission of disease between piglets and piglets.

6 regular deworming: aphid, whipworm and other internal parasite damage to the body's immune system to reduce the resistance of the pigs, aphid larvae by lung migration and lungworm will aggravate the respiratory disease, so with the drug to control the development of this disease It is of some significance that after the weaned pigs are transferred to the nursery for 2 weeks, the insect repellent with obvious effect on the parasites in the body and in vitro should be selected for deworming.

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