Prevention and treatment of fallopian tube cyst in chicken

Content: in recent years, a disease characterized by low laying rate, tubal dysplasia or stagnant water appeared in laying hens, which mostly occurred between 150 and 200 days old, and there was no cure after the disease, so it could only be eliminated with huge losses. Through epidemiological study and experimental detection, it is considered that the disease is caused by infectious bronchitis virus.

I. Epidemiology

The disease can occur in all breeds of chickens, and it mostly occurred in parental breeder flocks before 2000. In recent years, the incidence of commercial chickens has increased significantly. Sick chickens with stagnant water in the fallopian tubes appear one after another after the opening of the flock. The larger the proportion of sick chickens is, the lower the laying rate is. The general peak laying rate is 30% and 80%. After individual flocks eliminate sick chickens, the laying rate can reach 90%.

Most of the sick chickens are raised in the cold season (usually from January to March). Chicken farms with successive batches of brooding are prone to this disease. There is no vertical transmission of the disease, that is, some chickens from the same kind of chicken farm get sick and some do not. A large number of clinical investigations show that chickens are infected during brooding, but most of them do not show serious clinical symptoms. The symptoms of the laying period are the manifestations of IB sequelae.

Second, clinical symptoms and pathological changes

The appearance of the chicken flock is normal, but there is no peak in egg production, which is generally 30% and 80%. The diseased chicken's crown is thick and bright red (it sometimes looks redder than a normal chicken's crown) and its abdomen is sagging. Anatomy shows that there are vesicles of varying sizes in the fallopian tube, with more than 600 milliliters in large ones and several milliliters in small ones. Stagnant water is a clear, colorless, transparent and tasteless liquid. Some chickens have no hydrosalpinx, but have blind end or narrow fallopian tube or no oviduct orifice. The follicular development of most diseased chickens was normal. Some chickens have 6-7 mature eggs in the abdominal cavity, but they do not have fully functional fallopian tubes and cannot lay eggs. No abnormalities in other organs.

III. Treatment and prevention

A large number of clinical trials show that the disease is not caused by chlamydia, but by chicken infectious bronchitis virus, that is, chickens are infected with chicken infectious bronchitis virus in the early stage, causing lifelong damage to fallopian tubes and affecting egg production. There is no effective treatment for this disease, only diseased chickens can be eliminated. If the laying rate of the flock is too low, the whole flock should be eliminated.

4. Prevention can be done in the following ways

1. To ensure the relative stability of the brooding temperature during brooding, and the temperature difference within 24 hours should not exceed 3 ℃-5 ℃.

2. The temperature in the early stage of brooding should be as high as possible, generally reaching 35 ℃-38 ℃ in 1-3 days (as long as the temperature is a little higher in the case of uniform distribution of chickens). Then decreased 2 ℃-3 ℃ every 3 days.

3. The polluted nursery should be strictly disinfected and empty for at least one month before entering the brooding.

4. At the age of 1-3 days, the mice were immunized by nasal drip with freeze-dried vaccine.