Frequent chicken diseases in four seasons: symptoms, preventive measures and treatment ideas

I. Types and symptoms of chicken diseases prevalent in spring

(1)H9 subtype influenza

Typical symptoms of sick chickens are bleeding scales on their feet, yellow, white and green loose stools, black and purple crowns, dry and necrotic edges, swollen faces and moustaches. Some sick chickens bark and try to stretch their heads and necks upwards. The laying rate of laying hens decreased, while the number of preserved eggs, blood eggs and soft eggs increased.

After autopsy, it was found that the papilla of glandular stomach was bleeding at the base, covered with an endless layer of secretions, bleeding at the junction of glandular muscle and stomach, and the stratum corneum of muscular stomach was easy to peel off. The pancreas turns purple with transparent or crimson necrotic lesions, which is a characteristic lesion. The liver is swollen with yellow stripes. The kidneys are swollen, showing mottled kidneys. Coronary artery fat bleeding, sometimes epicardial bleeding. Follicle bleeding, from golden yellow to red, tubal congestion, edema, there are a lot of viscous white secretions.

(2) Mycoplasma synovialis

Sick chickens lie prone in cages, paralyzed, limping and unable to stand or stand on one leg. The joints, paw pads and chest keel of sick chickens are swollen, thickened and protruding, with a sense of fluctuation. During the course of the disease, the elderly chickens lost weight, pulled yellow-green feces, and some sick chickens purred and had a runny nose.

There is viscous, yellow or grayish white exudate in swollen joints and tendon sheaths of dead chickens. In the course of the disease, the exudate of the elderly is cheese-like, the surface of infected joints is often yellow, and there are more exudates from joints and foot pads.

(3) Chicken colibacillosis

A. Yolk peritonitis: The yolk breaks in the abdominal cavity and adheres to the intestine, and a layer of yolk substance is wrapped around the ovary.

B, salpingitis: the fallopian tube is swollen, bleeding, edema, with sticky strips or cheese-like, and the section is wheel-layered; Or there is a tofu-like secretion in the fallopian tube; Or lay preserved eggs and blood eggs.

C. Acute septicemia: The main pathological changes are that the pericardium and liver are covered with a gray-white cellulose membrane, the abdominal muscles and pectoral muscles are purplish red, and there is congestion in the capillaries of the chest airbag.

D. Pneumocystis: Simple Escherichia coli will thicken the air sac into a cloud shape and increase the gray secretion in the trachea.

E, swollen head syndrome: the main manifestations are swelling of the eyes and the whole head, and light yellow liquid oozing under the skin.

F, chicken omphalitis: it is characterized by a big belly and omphalitis. Autopsy showed malabsorption of yolk and softening of yolk sac.

J, arthritis: one or both sides of the sick chicken suffer from arthritis and swelling, or the foot pad is swollen, leading to claudication.

H, hemorrhagic enteritis: intestinal mucosa bleeding or shedding, intestinal contents are thin and contain bloody mucus.

First, ophthalmia: unilateral or bichromatic eye swelling, conjunctival flushing, cheese-like secretion, serious cases lead to blindness.

(4) Salmonella disease in chickens

First, chicken white dysentery.

Sick chickens are afraid of getting together in the cold, having loose bowels and discharging lime-like thin feces, commonly known as "paste anus". The contents of yolk sac of dead chicken become yellowish liquid or cheese-like. The heart is deformed with small gray nodules on it. The liver is swollen with gray needle-like or millet-like necrotic spots. The typical symptom of chicks is that the liver is swollen to several times normal, and scattered or dense little red dot or small white spots can be seen on the liver. Adult chicken follicular malformation, pear-shaped, triangular or irregular.

B. avian typhoid fever.

Sick chickens excrete green feces, their feathers are loose, their cockscomb is pale and their body temperature rises by 43℃-44℃.

The liver and spleen of dead chickens were obviously enlarged, and there were gray millet necrosis spots on the surface. The swollen liver turns into bronze green, commonly known as "bronze liver". The ovaries and follicles of laying hens sometimes bleed, deform and change color.

C, chicken paratyphoid fever.

Sick chickens close their eyes and shrink their heads, pull white feces, and make painful cries when defecating. There are strip or needle bleeding and white spot necrosis, pulmonary congestion and hemorrhagic enteritis in the liver and spleen of dead chickens.

? Second, preventive measures for chicken diseases in spring

A, breeder farms continue to quarantine chickens, eliminate positive chickens and purify vertical diseases, and commercial farms choose purified chickens with good reputation and good reputation.

B, keep the relationship between ventilation management and temperature, and always prevent and control the temperature difference stress. Pay attention to the weather forecast, gradually increase or decrease the effective ventilation in the henhouse with the change of external temperature, and reduce the temperature difference stress. Provide suitable temperature and humidity for chickens, clean feces in time, reduce ammonia concentration and provide a good environment for chickens.

C. drug prevention. Microecological agents such as probiotics or probiotic acids are added to chicken feed to control the reproduction of harmful bacteria. Traditional Chinese medicines such as Herba Euphorbiae Humifusae and Herba Plantaginis are regularly added to the feed for laying hens for anti-inflammatory and sterilization. When stressed, feed the chickens with multivitamins or astragalus polysaccharides to improve their disease resistance.

D, do a good job in biological safety.

Carry out all-in and all-out feeding mode, do a good job in disinfection of chicken farms during empty feeding, and disinfect vehicles and personnel entering and leaving chicken farms.

Disinfect frequently. Disinfectants such as double-chain quaternary ammonium salt, povidone iodine and sodium hypochlorite were used alternately, and chickens were disinfected once every 1-2 days to reduce the content of bacteria and viruses in the air and the surface of indoor objects. Soak the waterline with hydrogen peroxide and acidifier regularly to ensure the safety and hygiene of drinking water.

E, completes the epidemic prevention and antibody monitoring. Do a good job in immunization against influenza, Newcastle disease and infectious diseases. And monitor antibodies after immunization.

The following is the immunization plan for H9 subtype influenza in large-scale laying hens farm, for reference only:

14-day-old chicken Newcastle disease+avian influenza (H9)+ adenovirus triple oil vaccine, neck skin injection. 35-day-old Newcastle disease+transmission branch+avian influenza (H9) oil vaccine was injected into pterygoid muscle. 80-day-old Newcastle disease+avian influenza (H9)+ adenovirus oil vaccine, injected into pterygoid muscle. 130-day-old Newcastle disease+avian influenza (H9) oil vaccine, intramuscular injection.

? Third, the treatment scheme of chicken diseases prevalent in spring

Treatment of (1)H9 influenza

First use Qingwen Jiedu powder or Shuanghuanglian oral liquid to clear away heat and detoxify for 4-5 days. At the same time, laying hens used Maxing Houttuynia Powder and Glycyrrhiza Granules to treat respiratory tract, and cooperated with Andrographis paniculata and Euphorbia humifusa to eliminate enteritis and salpingitis for 4-5 days. Chickens were treated with doxycycline+tylosin+colistin sulfate to prevent secondary infection. After the chicken is mentally normal, astragalus polysaccharide, vitamin D3 and vitamin E are used to help restore egg laying.

(2) Treatment of chicken synovial bursa

Conditional chicken farms carry out drug sensitivity tests to screen sensitive drugs for treatment. Chickens were treated with sensitive drugs such as lincomycin+spectinomycin, tylosin+doxycycline and tylosin+doxycycline for 8 days. Paralyzed chickens were injected with enrofloxacin at the rate of 10 mg/kg and 1 time/day for 3-4 days. At the same time, vitamin AD3 powder and water-soluble cod liver oil are supplemented to help mucosa repair.

(3) Treatment of chicken colibacillosis

A, chicks use antibiotics such as norfloxacin, enrofloxacin and ofloxacin for 4-5 days. If there are symptoms of pneumocystis, hepatitis weeks and vitelline peritonitis, intramuscular injection of gentamicin sulfate, calculated at 3000-5000IU per kilogram of body weight, 65438+ 0-2 times a day for 3 days. B, chicks choose antibiotics with little side effects, such as norfloxacin, for 3-5 days. Then use probiotics and other microecological agents for 3-4 days to adjust the flora. C, laying hens are selected from broad-spectrum antibacterial traditional Chinese medicines such as andrographis paniculata and Euphorbia humifusa for 5 days.

(4) Treatment of Salmonella in chickens.

A. Chickens were given a mixture of sulfadiazine and sulfadiazine synergist (TMP), with the ratio of 5: 1 and the concentration of 0.02%. Antibiotics such as norfloxacin, enrofloxacin, florfenicol and ciprofloxacin can also be used for 4-5 days.

B, the chicks choose norfloxacin for 3-5 days. Then use probiotics and other microecological agents for 3-4 days to adjust the flora.

C, laying hens are selected from broad-spectrum antibacterial traditional Chinese medicines such as andrographis paniculata and Euphorbia humifusa for 5 days.