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Egg drop syndrome, 1976 (EDS'76).

¹a Veterinary Research Laboratories , Stormont , Belfast , BT4 3SD , Northern Ireland.

The Veterinary Quarterly

|November 2, 2011

Summary

A new avian condition, Egg Drop Syndrome 76 (EDS 76), causes shell-less or thin-shelled eggs in apparently healthy fowl. Duck adenoviruses are identified as the cause, with egg transmission being a key factor.

Area of Science:

Avian pathology
Virology
Poultry science

Background:

Egg Drop Syndrome 76 (EDS 76) is a newly identified clinical condition affecting fowl.
Affected birds, typically around 30 weeks of age, lay thin-shelled, soft-shelled, or shell-less eggs.
This condition manifests as a drop in egg production or failure to meet production targets.

Purpose of the Study:

To describe the clinical presentation of EDS 76.
To identify the etiological agents responsible for EDS 76.
To investigate the transmission and control of EDS 76.

Main Methods:

Isolation and characterization of haemagglutinating viruses from affected flocks.
Biochemical and biological studies to identify virus type.

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Epidemiological investigations into transmission routes.

Main Results:

Haemagglutinating viruses, identified as duck adenoviruses, were isolated from EDS 76 affected flocks.
Evidence suggests the virus is egg-transmitted.
Lateral spread between flocks appears minimal with proper biosecurity during handling.

Conclusions:

Duck adenoviruses are the causative agents of EDS 76.
Egg transmission is the primary route of spread.
Eradication from basic breeding stock is an effective control strategy in Northern Ireland.