Egg drop syndrome-76 (eds-76), Biology

Assignment Help:

Egg drop syndrome-76 (EDS-76)

An outbreak of sudden drop in egg production or a failure to achieve a normal peak in production despite optimum managemental and nutrition status is attributed to a viral disease called as EDS-76. The cause was  identified as adenovirus, first isolated in Northern Ireland in 1976. Mortality is usually negligible. Circumstantial evidence suggests that the main route of transmission is through the eggs (vertical transmission) followed by latent infection during growing stage with viral excretion starting shortly before sexual maturity. Contamination of egg trays at packing stations and biting insects may play a part in transmission. The virus is commonly present in ducks and geese but does not cause the disease. Lateral transmission from bird to bird is slow.

Symptoms and lesions: The disease occurs during sexual maturity. Birds do not show clinical signs of the disease except drop in egg production at peak or failure to peak. Drops may be up to 50% and for 3-4 weeks duration. Rough, thin or soft-shelled eggs and shell-less eggs, loss of shell pigment, poor internal quality are the other indications.

Diagnosis: Diagnosis is made from the characteristic clinical feature of rapid drop in egg production during the peak production in broiler parents, the characteristic shape of the eggs laid and the virus isolation from the cloacal swabs. EDS-76 virus can agglutinate red cells of chicken, duck, turkeys, geese and pigeons but not mammalian cells. The virus can be propagated in 9 day embryonated duck eggs by the allantoic route in which it produces very high titre. The antibody in affected flock can be detected either by hemagglutination inhibition, virus neutralization or ELISA tests.

Prevention and control: Vertical transmission can be avoided by selection of birds from uninfected flocks and good hygiene and management. Proper disposal of infected eggs should be made as they are the most important source of the virus. Vaccination with an oil adjuvant inactivated vaccine is reported to give good protection when given at 14 to 16 weeks of age.


Related Discussions:- Egg drop syndrome-76 (eds-76)

Aspirin, ASPIRIN - It is acetylsalicyclic acid (C 6 H 4 (OCOCH) 3 ...

ASPIRIN - It is acetylsalicyclic acid (C 6 H 4 (OCOCH) 3 CH 3 ). It changes in salicyclic acid in body. It is analgesic, antipyratic (fever reducing), anti inflamma

Buffers in foods, Some foods are better able to resist changes in pH than...

Some foods are better able to resist changes in pH than others. These tend to resist changes in pH since these are buffered and the ability to resist changes in pH is known as bu

What is aortic stenosis, Q. What is Aortic stenosis? Left Ventricular o...

Q. What is Aortic stenosis? Left Ventricular outflow tract obstruction can occur due to various aortic valvular, subvalvular and supra valvular lesions. Valvular Aortic Ste

Chemical reactions which are catalysed by enzymes, Give two examples of che...

Give two examples of chemical reactions which are catalysed by enzymes in the course of brewing.  In the course of brewing, enzymes in the grain catalyse the conversion of star

Observation or inference for half and full saturation test, Define Observat...

Define Observation or Inference for half and full saturation Test? 1. Starch is precipitated by half saturation with ammonium sulfate whereas dextrin is not precipitated. This

Body musculature - locomotion, Body Musculature - Locomotion The layou...

Body Musculature - Locomotion The layout of the muscle layers surrounding the coelom is necessarily the same in all the major classes of Annelida. The body wall has a layer of

Endosperm, 1. What are the examples of helobial endosperm

1. What are the examples of helobial endosperm

What do you meant by diabetic ketoacidosis, Q. What do you meant by Diabeti...

Q. What do you meant by Diabetic Ketoacidosis? Diabetic Ketoacidosis (DKA) is one of the acute complications of diabetes mellitus. The name itself implies that there is acidosi

What is the approximate ph of the salivary secretion, What is the approxima...

What is the approximate pH of the salivary secretion? Is it an acid or basic fluid? What are the main functions of saliva? The saliva pH is approximately 6.8. It is therefore a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd