The distinguishing points of several egg dropping syndromes in laying hens

Egg-reducing disease in laying hens only reduces egg production rather than stopping egg production. The common symptom at the time of onset is a large drop in chicken egg production rate. At the same time, producing light-colored eggs, thin eggs, soft-shelled eggs, and misshapen eggs does not generally result in The death of a sick chicken. Common egg drop syndromes in laying hens include six diseases: chicken egg drop syndrome, non-high pathogenic avian influenza, chicken pox, infectious bronchitis, avian Campylobacter, and vitamin A deficiency. The following are mainly identified from clinical symptoms and visceral lesions:

1, chicken egg drop syndrome. It usually occurs in laying hens aged from 170 to 220 days. It does not show other clinical symptoms at the time of onset. Only autopsies of the fallopian tube, edema, hypertrophy, bleeding or atrophy of the ovary can be seen in the necropsy, and egg production can be restored around January.

2. Non-highly pathogenic avian influenza. The disease is infectious, acute onset, there is a clear one-off symptoms of influenza, chicken edema, cyanosis, head swelling; necrotizing tonsillar swelling, bleeding, intestinal ring plaque bleeding, pericarditis.

3, chicken pox. The symptoms of fowlpox are more obvious. There are pox nodules in the glabrous areas of diseased chickens such as crowns, gills and fleshy eyes. In the necropsy, fibrinous necrosis pseudomembranes can be seen in the throat, throat, and gastrointestinal tract. .

4, infectious bronchitis. The disease is often associated with poor ventilation, poor nutrition, and other incentives. The diseased chickens showed obvious dyspnea, diarrhea, yellow to white and yellow to green dilute feces; after the necropsy, the upper respiratory tract showed serous, catarrhal, Cheese-like secretions, kidney swelling was patchy, and urate in the posterior segment of the rectum.

5. Avian Campylobacteriosis. After infection, the diseased chicken's cocks have wrinkled and crusted fins, accompanied by water diarrhea, weight loss symptoms, visceral lesions mainly in the liver, hepatomegaly, hemorrhage, yellow-brown, the surface bulges cauliflower-like, there are Suppository foci.

6, vitamin A deficiency. The disease is a nutritional metabolic disease, long duration, clinical manifestations of photophobia, tearing and other visual disturbances; characteristic lesions in the mouth, esophagus typical white small pustule nodules, and some form a gray pseudomembrane, while internal organs Urate deposition.

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