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)

What might explain the pattern, A zoologist is investigating a population o...

A zoologist is investigating a population of squirrels whose coat color is controlled by a single gene whose two alleles (B1 & B2) are codominant. B1B1 individuals are black, B1B2

Viral genome, describe the different types of genomes that viruses can have...

describe the different types of genomes that viruses can have

Density dependent factors - population regulation, Density Dependent Factor...

Density Dependent Factors - Population Regulation The density dependent factors are intrinsic or biotic factors and they depend on interactions between individuals within same

What is the mechanism described by darwin, What is the mechanism described ...

What is the mechanism described by Darwin that eliminates species less adapted to environmental conditions? The mentioned mechanism is the natural selection.

Lysosomes, Lysosomes Lysosomes are small vesicles which are bounded ...

Lysosomes Lysosomes are small vesicles which are bounded by a single membrane & contain hydrolytic enzymes in the form of minute crystalline or semi crystalline granules of

Define interaction of vitamin k with vitamins a and e, Define Interaction o...

Define Interaction of Vitamin K with Vitamins A and E? Excess vitamin A interferes with vitamin K absorption while the a-tocopherol or vitamin E, as we have already studied ear

What is eukaryotic cells , What is Eukaryotic Cells ? Eukaryotic Cel...

What is Eukaryotic Cells ? Eukaryotic Cells :  Most cells of higher organisms, and many unicells, contain a nucleus. Organisms whose cells contain a nucleus are called euka

Determine some dietary sources of vitamin c, Determine some Dietary Sources...

Determine some Dietary Sources of Vitamin C? Fruits (particularly citrus fruits), vegetables are the best sources of ascorbic acid. Amla is the richest source of ascorbic acid.

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