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

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.

Posted Date: 9/18/2012 8:47:28 AM | Location : United States







Related Discussions:- Egg drop syndrome-76 (eds-76), Assignment Help, Ask Question on Egg drop syndrome-76 (eds-76), Get Answer, Expert's Help, Egg drop syndrome-76 (eds-76) Discussions

Write discussion on Egg drop syndrome-76 (eds-76)
Your posts are moderated
Related Questions
Human respiration Human beings are adopted for terrestrial mode of life. They conduct pulmonary respiration. This system consists of external nostrils, nasal cavities, pharyn

What happens to the movement of the air bubble if the apparatus is kept in i. In the dark ii. In sunlight iii.In front of a fan

Advantages and Disadvantage of using Turbidity Measurement? Advantages 1. It is an easy, rapid and sensitive technique. 2. Turbidity measurement can be done without destr

What would be the advantage of using a patient's own stem cells e.g. blood stem cells, to treat his or her illness? The benefit of using stem cells from the patient being trea

What is the futile cycle The futile cycle is avoided because covalent modification, by  phosphorylation, has opposite effects on  the  enzymes concerned with  the  synthesis  a

Q. Which chemical elements are involved to form most of living biological matter? The chemical elements that form most of the molecules of living beings are carbon (C), oxygen

Epitope: As related to the protein antigens, B-cell epitopes comprises the amino acid residues of the protein molecule in which interact directly through the noncovalent bonds wit

What are the uses of construction of a retaining wall? The retaining wall is constructed whenever space requirement do not allow the natural slope to be formed for an excavatio

Q. How is the light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is converting into chemical energy contained in o

Classification of Protozoa Traditionally, protozoans have been classified as flagellates, amoebae, sporozoans and ciliates. We have retained this broad grouping for convenienc