Vitamin E Deficiency is a chicken health condition. Vitamin E deficiency (‘crazy chick disease’) causes permanent neurological damage. Young chicks are most severely affected. Supplement immediately if suspected. This guide covers what to watch for, causes, treatment, and prevention strategies.
What It Looks Like
Watch for these signs:
Nervous system / balance: Bird staggers, trembles, or loses balance; falls easily; head may tilt
Nervous system / muscles / mobility: Bird cannot walk; hind legs are paralyzed; lies down and cannot rise
Nervous system / head / neck: Neck is twisted or bent abnormally; head held to the side
Head / neck / face: Visible swelling of face, eyelids, or neck area
Growth / overall condition: Affected birds grow poorly, appear frail and thin
General / acute: Affected birds may die suddenly or deteriorate rapidly to death
Likely Causes
- Inadequate dietary vitamin E (often combined with selenium deficiency, which exacerbates the problem)
- Selenium deficiency reducing the activity of glutathione peroxidase (protective enzyme requiring both E and Se)
- Oxidation of dietary fat and vitamin E in feed over time or from improper storage
- High dietary unsaturated fat without adequate vitamin E protection against oxidation
- Malabsorption from intestinal disease or dysbiosis
About This Condition
Body System Affected: Nervous system (particularly cerebellum); muscle tissue; immune system; antioxidant defense
Severity: serious
Contagious: No, not contagious
Affected Age Groups: chicks
What to Do
Provide vitamin E supplementation: injectable vitamin E or E-Se (vitamin E + selenium) if available (consult a vet). Chicks under 2 weeks benefit most from early intervention. Supportive care: warm, clean housing; easy access to feed and water; isolation to prevent injury from incoordination.
When to See a Vet
If you see sudden neurological signs (tremors, ataxia, paralysis) especially in young chicks, contact a vet immediately. Early vitamin E-Se injection may prevent permanent damage.
Prevention
Use quality feed with adequate vitamin E fortification and optimal storage. Co-supplement with selenium (which is required for vitamin E function). Avoid rancid or oxidized feed (store in cool, dry place; do not use old or improperly stored grain). Consider vitamin E-Se supplementation during stress periods.
Frequently Asked Questions
Q1: Why is vitamin E called ‘crazy chick disease’?
In hatcheries, vitamin E deficiency caused chicks to behave erratically—tremoring, twisting their necks, losing coordination—appearing ‘crazy’ before becoming paralyzed. Modern commercial feed prevents this, but it can still occur in homemade diets or improperly stored feed.
Q2: How is vitamin E related to selenium?
Selenium is required to activate glutathione peroxidase, an enzyme that works WITH vitamin E to protect cells from oxidative damage. Both must be present. Deficiency in either one exacerbates the other. Co-supplementation is important.
Q3: Can birds recover from vitamin E deficiency?
If caught VERY EARLY (first signs), vitamin E-Se supplementation may prevent permanent damage. However, once paralysis develops, recovery is unlikely. Prevention through proper feed storage and supplementation is far more effective.