Chicken white-crown disease, also known as chicken carrionllosis, is an intracellular parasitic protozoan disease caused by leukocereus carinii. The disease was first discovered by Mathis and Legar in northern Vietnam in 1909. Now, there is a large area of ​​epidemic and morbidity in China. Chickens of all ages can infect this disease. The infection rate and incidence of young chickens are high, and the symptoms of chickens are not obvious and become the source of infection. The age of infected chickens ranges from 25 to 130 days and the mortality rate varies from 10% to 80%. The incubation period for naturally infected chickens is generally 6 to 10 days. The symptoms of chicks are obvious and the mortality rate is high. The symptoms of laying hens are lighter, and the average laying eggs drop by about 10% and occasional deaths. Diseased chickens lack of appetite, mental depression, runny nose; row of yellow-green, yellow-white dilute feces, legs flabby, walking difficulties; individual chicken hemoptysis. The sick chicken is pale and anemic. Changes in necropsy were emaciated corpses, needle-like bleeding in the leg muscles and pectoral muscles, swelling of the liver and spleen, and brittleness; red foamy mucus in the trachea; duodenal serosa, pancreas, small intestine serosa, and gastric wall fat also scattered in the haemorrhage. Point; renal hemorrhage; intestinal inflammation. The disease's transmission medium is Kudzu. Kusui breeds rapidly in humid environments above 20°C. Therefore, the high-temperature and rainy season of April to October every year is the high incidence period of this disease. The occurrence of white-crown disease in chickens has brought great losses to production. Now we will talk about comprehensive prevention and control measures in light of production practices.
1 Preventive measures
1.1 Killing vector insects Killing vector insects is an important part of preventing this disease. The larval larvae of the locust locust live in the clean water flow ditches or paddy fields instead of in the effluent and feces, so it is difficult to take effective killing measures against the larvae of the larvae, but the insecticides can be used to eliminate the broiler house and the surrounding environment. In the library of adult insects. In the popular season from April to October, the house was sprayed with insecticides inside and outside the house. For example, 0.03% of fly phos- phorus was sprayed to kill insects. It can also be sprayed with 0.05% pyrethrin first, and then sprayed with 0.05% 100 toxins, which can not only kill pathogenic microorganisms, but also kill harmful insects such as cockroaches. Disinfection time is generally selected from 18:00 to 20:00 in the evening, because the library is most active during this period. If the chicken house is near the pond, there are more weedy trees in front of the house and behind the house, and if the ventilation is poor, the breeding of the library is faster. Therefore, it is recommended to spray glyphosate around the house or to eradicate the house around the house before June. Weeds, while strengthening the ventilation of the sheds.
1.2 Prevent the storehouse from entering the coop house door to install curtains, windows and air intakes to install gauze. Spraying 6% to 7% of malathion and other drugs on the screens can kill blood-sucking insects such as cockroaches, and the treated screens can continuously kill the cockroaches for more than 3 weeks.
1.3 Drugs prevent the development of white blood cell nematodes from 22 to 27 days, so they can be started with effective drugs about 1 month before the onset of the disease. Generally, every 5 days, 5 days, and 3 to 5 courses , This is more effective than the disease after the treatment, can play a multiplier effect. Commonly used effective drugs are: (1) compound Taichen net 30 ~ 50mg/kg mixed feed; (2) pyrimethamine 1mg/kg mixed feeding; (4) sulfaquinoxaline 50mg/kg mixed feed or mixed water; (5 ) Cute Dan 125mg/kg mixed feed.
1.4 Enhance the resistance of the chicken body (1) Do a good job of cooling the sun and prevent the heat, strengthen the ventilation and ventilation of the chicken house and reduce the rearing density; (2) Appropriately increase the nutrient concentration of the feed, increase the amount of vitamins and animal protein feed, and keep better (3) Adding anti-stress agents; (4) Doing comprehensive prevention and control of infectious diseases and other parasitic diseases that are prone to occur in summer.
2 treatment measures
Commonly used therapeutic drugs are: Compound Taizhuan net, according to 100mg/kg mixed water or 200mg/kg mixed, once every 5 to 7 days; blood worm net, according to 100mg/kg mixed water, used for 5 days; grams ball powder, According to 250mg/kg mixture, used for 5 days; chlorobenzene oxime, according to 66mg/kg mixed, used in conjunction 3 to 5 days; Chinese medicine card Bai Ling, 1% mixed feed fed 5 to 7 days, the effect is significant. The above-mentioned drugs are used for treatment, and after the disease is stable, a certain amount of time may be added according to the prevention amount to completely kill the leukocyte worms of the chicken body.
The combination therapy has a good effect: when the flock develops, the water-soluble Taichenjing is administered by drinking water, and the concentration is 0.05% for 3 to 5 consecutive days. The effect of this drug has no adverse effect on the egg production, and it is mixed in the feed. Compound enemy bacteria net, 60 ~ 120mg/kg, use 3 to 5 days: Select bucky amine drinking water for broilers and layer chicks, 0.01% enemy bacteria net mixture, once every 3 to 5 days, after the basic control of the disease, The dose is halved for another 5 days. For severe diseased chickens, the intramuscular injection of sulfadiazine is 0.05 to 0.10 g per chicken, and the enemy's net dose of 30 to 50 mg per animal is administered. The chicken is then placed in a quiet environment. Let it move freely. After 3 days of treatment, the condition was controlled, 5 days died and 8 days returned to normal.
Adjuvant treatment measures: (1) Vitamin C is added to the feed to reduce stress and promote wound healing. Vitamin K is added to maintain the normal coagulation function of the chicken body. Vitamin A is added to maintain the integrity of the wall tissue in the chicken body. Copper sulphate, ferrous sulphate and vitamin E are added, and the added amount is 2 to 4 times the normal requirement, which can improve the therapeutic effect; (2) Adjust nutrition, increase the protein level in the feed, and increase the content of methionine and tryptophan. . Enzyme preparations, acid preparations and other digestive substances are added to the feed to increase the appetite of the chickens, promote digestion and maintain balance in the gut flora of the chickens, enhance resistance, and speed up physical recovery.
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