Egg drop syndrome (EDS-76) vaccines
Egg drop syndrome (EDS-76) is caused by an adenovirus that infects the shell gland of laying hens. Apparently healthy birds suddenly lay fewer eggs, with thin, soft, shell-less or pale eggs. Ducks and contaminated water can carry the virus, and it can pass through eggs. An inactivated vaccine given before lay is the standard protection.
Signs to watch for
- Sudden drop in egg production in healthy-looking birds
- Thin-shelled, soft-shelled or shell-less eggs
- Loss of brown shell colour
- Failure to reach expected peak production
Which birds are at risk?
Layers and breeders at or near the start of lay.
How vaccination protects your flock
A single inactivated EDS vaccine (often combined with ND and IB) is injected during rearing, a few weeks before the start of lay. Keep ducks and wild birds away from layer farms and protect water sources.
Egg Drop Syndrome (EDS-76) vaccines from Shiv Sales
Inactivated EDS-76 vaccines that protect layers and breeders from sudden production drops and shell-quality problems.
Egg Drop Syndrome (EDS-76): common questions
Why are my hens laying soft-shelled eggs?
EDS-76, infectious bronchitis, Newcastle disease, calcium or vitamin D deficiency and heat stress are common causes. Laboratory tests help identify the reason.
When is EDS vaccine given?
Once during rearing, a few weeks before the start of lay, usually as an inactivated injection.
Can ducks spread EDS?
Yes. Ducks and geese can carry the virus without signs, so keep them away from layer houses and water.
Related guide
Why vaccines fail — and how to prevent it
When a vaccinated flock gets sick, the vaccine itself is rarely the problem. Most failures come from what happens between the fridge and the bird.
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Signs, affected ages and vaccines for the 12 most important poultry diseases.
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This page is general information for farmers and does not replace veterinary advice. Always follow the vaccine manufacturer's instructions.
Need help choosing the right vaccines?
Talk to our team for a vaccination schedule built around your flock, location and disease pressure. Consultation is free for customers.