Infectious gonadal gastritis in chickens and its prevention and control measures

In recent years, an infectious disease characterized by poor growth, emaciation, poor uniformity, enlarged glandular stomach such as milky globule, glandular gastric mucosal ulcer, exfoliation and myogastric erosion has caused great losses to the breeding industry. This disease is called infectious glandular gastritis.

I. pathogen

The pathogen of the disease has not been clearly explained. The pathogen of the disease is a coronavirus, and other viruses are also associated with the disease, such as low-fiber diet, mycotoxin, reovirus, tumor-induced virus, avian reticuloendotheliosis virus, polyoma virus, adenovirus, double RNA virus and bacteria. Therefore, the disease is a syndrome caused by one or more infectious pathogenic microorganisms and non-infectious factors; digestive tract and endocrine organs are the targets of these pathogenic factors.

II. Popular characteristics

1. Infectious gonadal gastritis can be transmitted in different breeds of laying hens and broilers. The disease can also be found in 817 broiler chickens. The disease can now be seen in all parts of the country, and the incidence varies from place to place, with a minimum incidence of about 10% and a mortality rate of about 30%. It is reported that the disease can be seen in broilers at the age of 21 days. The course of the disease in laying hens is about two weeks, and the death peak of infection is more than one week.

two。 The etiology of the disease is complex, and the pathogen may be vertical transmission. Different breeds of chickens are found to occur at the same time in the same batch of chickens in the same farm. It is suspected that it is the vertical transmission of breeder.

Third, the inducement of the disease

1. Feed condition inducement: feed nutrition imbalance, low protein, vitamin deficiency, mold, toxin and so on are the causes of the disease.

two。 Ophthalmitis: ophthalmitis is an important cause of the disease. it is found that all chicken farms with glandular gastritis are first caused by ophthalmitis symptoms.

3. Infectious diseases: now the pathogen of some infectious diseases is also the inducement of the disease, such as clinical common fowlpox, enterotoxic syndrome, reticuloendotheliosis, chicken anemia factor, Marek and so on.

IV. Clinical symptoms

The initial symptoms of the disease showed dishevelled feathers, lethargy, drooping wings, tears and swollen eyes, mid-term food intake and drinking water decreased sharply, chickens were accompanied by respiratory symptoms, white or green thin feces. The diseased chickens gradually lost weight, showing a negative growth trend. The size and weight of the chicken are uneven, and there is no peak of egg production. The production level of the flock decreases, and a small number of sick chickens can develop claudication and eventually die of exhaustion. The course of the disease is usually 8-10 days.

5. Anatomical symptoms

1. The glandular stomach of diseased chickens is characteristic. After autopsy, the glandular stomach was enlarged like a ball, milky white, and the grayish-white lattice appearance could be seen after careful observation.

two。 Incision of the glandular stomach shows that the glandular stomach wall thickening, edema, gently press can flow out serous fluid, nipple swelling and bleeding, nipple boundary fusion, no boundary can be divided; muscle stomach, thymus, spleen serious atrophy; intestinal mucosa exfoliation, bleeding symptoms.

VI. Prevention and control measures

1. Emergency vaccination. The whole flock of chickens were urgently injected with proventriculus type infectious bronchitis oil emulsion inactivated vaccine. 0.5ml/, 10 or 15 chickens were injected with a needle. Healthy chickens were injected first, and then seriously sick chickens were injected to prevent the spread of infectious bronchitis through needles.

two。 Control measures.

At ordinary times, ① should strengthen management, improve environmental hygiene, appropriate feeding density, and pay attention to ventilation.

② is a new coronavirus disease, and it is ineffective to be treated with antibiotics alone. Vaccination should be taken at the age of 10-20 days, and 0.3~0.5ml/ should be injected with oil emulsion inactivated vaccine or tissue inactivated vaccine of proventriculus infectious bronchitis, and once again 15-20 days before laying, each 0.5ml can prevent the disease.

3. medication

The whole flock of ① chickens drank Adenweishukang (water 100kg) in the morning, penicillin (50000 units / chicken) + Qidu (water-to-water 150kg) in the afternoon, and mixed ingredients in the evening for five days.

② Dienke (water-to-water 100kg) drinking water + Xianwei Yankang (500chickens / bag) were mixed with penicillin (50000 units / chicken) for 5 days. Five days after adopting the above methods, the condition of the flock was obviously improved and the epidemic situation was controlled.