Chicken Egg Drop Syndrome (EDS-76) is an infectious disease caused by adenovirus, which can reduce the egg production rate of chickens by 30% to 50%, and the eggshell breakage rate of more than 40%. The disease is listed as one of the four major viral infectious diseases that bring huge economic losses to the chicken industry.
1. Epidemic situation. There are 28 professional chicken households in a certain area, and more than 18,000 chickens are produced in Yisa. After entering the opening period and the peak of laying eggs, the egg laying rate of some laying hens suddenly dropped from 88.6% to 68.2%. At the same time, accompanied by soft shell eggs, shellless eggs and other symptoms, 14 batches of laying hens occurred in 1 month.
2. Clinical symptoms. The age of the diseased flocks was between 180 and 240 days old. The egg production rate decreased by 9.6% to 41.5%, and the recovery period was 5 to 10 weeks. However, the standard egg production curve could not be reached after recovery. Some of the sick chickens are depressed and have soft stools 2 to 3 days before the egg drop. The color of the eggshell changes significantly, the surface is rough, faded, the shell is thin and fragile, and there are shellless eggs and malformed eggs.
3. Pathological changes. The diseased chicken has large tubal, thick wall, fragile, longitudinal incision, severe valgus in the mucosal surface; milky white exudate in the isthmus and uterus; white gland secretion and isthmic serosa, pale mucous membrane, luster The hand touched the sensation; the uterine mucosa was pale red, shiny, and individual follicles bleed.
4. Causes of the disease. 1 species of poultry and eggs are poisonous. They are recessive infections before sexual maturity of the hens. After the laying of the eggs, they show symptoms due to various factors. 2 The circulation of poultry products may cause the disease to pass from the infected areas to the pest free areas; Improper feeding and management will weaken the laying hens and cause the spread of the disease.
5. Control measures. 1 Strengthen feeding management and disinfection measures to prevent virus transmission and infection; 2 It is strictly forbidden to introduce breeding poultry and eggs from infected areas; 3 chickens, ducks and geese should be kept separately to prevent mutual infection; 4 for unopened laying hens can be 115~ The use of EDS-76 extinguished seedlings at 135 days can effectively control the occurrence and spread of the disease; 5 EDS-76 can be used urgently for the diseased chickens, which can speed up the recovery of the sick chickens and restore the egg production performance.
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