Chicken coccidiosis is very harmful to chicks and chicks. 15 ~ 50-day-old chicks have a high morbidity and mortality rate of over 80%. Tolerant chicks grow slowly and are stunted. Adult chickens are mostly infected with insects, and their weight gain and egg production are affected to some extent.

(1) Epidemiology: The host of coccidia is specific, that is, coccidia that attack chickens will not attack other poultry such as turkeys. All kinds of chickens are susceptible, and 1 day-old chickens are also susceptible, but they are protected by maternal antibodies, and rarely get sick within1day-old. 15 ~ 50 days old has high morbidity and mortality, and adult chickens are also sensitive to coccidia. The resistance of coccidia oocysts is very strong, and it can last for 4 ~ 9 months in soil. Sick chickens are the main source of infection. There are oocysts in feed, drinking water, soil or utensils contaminated by infected chickens. The main route of chicken coccidia infection is eating infected oocysts.

(2) Clinical symptoms: ① The course of acute type is 2-3 weeks, which is more common in chicks. At the early stage of the disease, mental depression, loose and messy feathers, and inactivity; Loss of appetite, the comb and mucosa are pale and visible, and gradually lose weight; Drainage is like a small amount of blood. If it is cecal coccidia, the feces will be brownish red, and then it will become bloody stool. The mortality rate of chicks is as high as 100%. ② Chronic type: Chronic type is more common in chickens or adults aged 2-4 months, and its symptoms are similar to those of acute type, but not obvious. The course of the disease is also long, dragging on for weeks or months. The sick chickens gradually lost weight, laid fewer eggs and had intermittent diarrhea, but died less.

(3) Preventive measures: ① The henhouse should be kept clean, dry and well ventilated, and the feces and damp padding should be removed in time. ② Feeding troughs, drinking fountains, utensils and perches should be cleaned and disinfected frequently to reduce the chance of infection. ③ Sufficient vitamin A and vitamin K should be kept in the feed to enhance the resistance and reduce the incidence. ④ Treatment: 0.02% iodophor dichloride was mixed with 5∶ 1, and Qiuliling was mixed with 0.0 125% feed, and it was continuously fed for 30 ~ 45 days from the age of 15. Coccidiosis solution: the latest generation of chemically synthesized anticoccidial drugs, with broad spectrum, high efficiency, low dosage, low cost and wide safety range, are mixed with 200 kilograms of water for 3-5 days every 20 ml.