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)

Which process is called "reverse osmosis", When water containing impurities...

When water containing impurities is forced against a filter that allows only water through, this process is called "reverse osmosis". Why is this a good description of what is happ

Venous return, This is the amount of blood that is returned to the heart by...

This is the amount of blood that is returned to the heart by the veins. This is influenced by various factors. Inspiration decreases the pressure in the  central veins and thus inc

Define agar syringe or agar sausage method, Define Agar Syringe/Agar Sausag...

Define Agar Syringe/Agar Sausage Method? Agar syringe method involves 100 ml syringe, which is filled with agar. A layer of agar is pushed beyond the end of the barrel by means

External ear, EXTERNA L EAR - It is an oval shaped, some what funne...

EXTERNA L EAR - It is an oval shaped, some what funnel like, skin covered flap of elastic cartilage and muscles. It's outer stiff ridge is called hellix. Lower flexibl

What is erythropoietin, What is Erythropoietin (EPO)   A.  is secreted ...

What is Erythropoietin (EPO)   A.  is secreted by peritubular interstitial cells of the kidney cortex.   B.  acts by increasing the production of red blood cells by cells in

Species diversity - synthetic characters, Species Diversity - Synthetic Cha...

Species Diversity - Synthetic Characters It is one of the most important and basic characteristics of a community. There are various ways of measuring species diversity the si

MEGASPOROGENESIS, WHAT IS MEGASPOROGENESIS?wHERE IT OCCUR?hOW IT OCCURS?

WHAT IS MEGASPOROGENESIS?wHERE IT OCCUR?hOW IT OCCURS?

Is acetylcholine found in brain, Q. Is Acetylcholine found in brain? Ace...

Q. Is Acetylcholine found in brain? Acetylcholine is found in many parts of the brain having particularly high concentrations in the cerebral cortex, limbic system, basal, foreb

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