Diagnosis and prevention of pullorum in chickens

Chicken pullorum is a very common infectious disease, which occurs all over the world. It is caused by Salmonella pullorum. Its excretion is an important medium of transmission. At the same time, it can also be transmitted vertically through eggs, mainly harming chicks. In recent years, the incidence of young chickens is also on the rise. Let's take a look at the diagnosis and prevention of chicken pullorum.

Symptoms of chicken pullorum

Chicks do not eat feed, afraid of cold, curled up, wings drooping, mental depression or lethargy, white thick or yellowish, light green thin stool, and the anus is sometimes closed by hardened feces, making it difficult to breathe. Adult chickens have no clinical symptoms, a few seriously infected chickens show mental malaise, discharge yellowish green or egg white-like loose stool, the main lesions can be seen liver and spleen enlargement, fragility, necrotic spots, kidney dark red congestion or pale anemia, often changes in peritonitis. Laying hens showed atrophy of ovaries, degeneration of eggs and cessation of egg laying in diseased hens.

Diagnosis of pullorum in chickens

Liver necrotic foci and pullorum nodules were taken for histopathological examination, local tissue necrosis and disintegration, infiltration and proliferation of lymphocytes, plasma cells, heterophil and fibroblasts. The diseased materials collected by the local officials of the heart, liver, spleen, lung and ovary of sick and dead chickens were inoculated in ordinary Agar medium for bacteriological diagnosis. After 24 hours, a small colony with a neat edge, smooth surface, moist and shining, gray-white translucent and 1 cm in diameter can be grown.

Prevention of Chicken White dysentery

1. Breeder chickens with bacteria were detected and eliminated through serological tests. the first examination was carried out at the age of 60-70 days, and the second examination could be carried out at the age of 16 weeks. After that, the positive chickens were detected every one month, and the positive chickens were eliminated in time, until the positive rate of the whole population did not exceed 0.5%.

2. Eggs were selected in time and fumigated with 28ml / m ~ 3 formalin for 20 minutes after picking eggs, entering the incubator and falling to the plate at the age of 18 ~ 19 for 20 minutes. When the hatching reaches about 50%, fumigate and disinfect again with 10 ml / m 3 formalin in the hatching apparatus. At the same time, the hatchery should also establish a strict disinfection system.

3. Clean and disinfect the floor, utensils, feeding troughs, cages, drinking fountains, etc., to disinfect the chickens regularly.

4. Strengthen the feeding and management of Uygur chickens and pay attention to drug prevention. 0.04% dysentery, 0.05% chloramphenicol and 0.005% norfloxacin can be alternately added to the feed for prevention in the epidemic areas of the disease.

Treatment of chicken pullorum

1. Every kilogram of feed is mixed with 200 kg 400 mg of dysentery (2-4 tablets) and fed to the chickens for 7 days, stop for 3 days, and feed for another 7 days.

2. Feed the chickens with 200 mg of oxytetracycline (or chlortetracycline) per kilogram (250 mg per tablet), or 2: 3 grams of oxytetracycline (8-12 tablets) per kilogram of beverage for 3-4 days.

3. Each chicken is fed with penicillin 2000 international unit every day for 7 days.

4. 10 grams of sulfadimidine (or sulfadiazine) (20 tablets) or 5 grams of sulfadiazine (10 tablets) per kilogram of feed are added to chickens for 5 days, and streptomycin or chloramphenicol can also be added to drinking water at 0.1-0.2% for 7 days.