Blood on Egg Shells: Vent Damage, Big Eggs, or Something Worse
A streak of blood on an otherwise normal shell usually means small tears at the vent, most common in pullets laying their first eggs and in hens laying unusually large or double yolk eggs. It typically resolves on its own. Blood on many eggs, blood along with tissue at the vent, or a hen the flock is pecking at needs a hands-on check for prolapse, which is an emergency.
Most likely causes
- First eggs
New layers commonly show light blood streaks for a few eggs.
- Oversized eggs
Double yolkers and jumbo eggs stretch tissue and cause small tears.
- Vent prolapse
Tissue protruding from the vent is urgent and can lead to fatal picking.
- Mites or picking
External parasites and flockmates can cause vent bleeding unrelated to laying.
What to do this week
- Inspect the hen's vent in good light while she is calm.
- Separate any hen with visible tissue or open wounds so the flock cannot peck her.
- Check for mites at night around the vent and under the wings.
- Reduce protein-heavy overfeeding that pushes very large eggs in young hens.
When it is worth a closer look
- Tissue protrudes from the vent, which is a prolapse and needs immediate care.
- Blood appears on most eggs over several days.
- The hen is straining, hunched, or has stopped eating.
This page is husbandry guidance, not veterinary diagnosis. If a bird is in distress, contact a poultry vet.
Common questions
Should I wash blood off eggs?
Wipe them dry or wash with water warmer than the egg just before use, so you do not pull bacteria through the shell.
Is blood on the shell an emergency?
A streak from a new layer is not. Visible vent tissue or ongoing bleeding is.