Thiamine Deficiency is a chicken health condition. Thiamine deficiency causes severe neurological damage and can be fatal. Provide supplemental thiamine immediately if suspected; early treatment can reverse early signs. This guide covers what to watch for, causes, treatment, and prevention strategies.
What It Looks Like
Watch for these signs:
Nervous system / legs: Bird walks unsteadily, wobbles, or stumbles; may hold legs in abnormal positions; loses balance easily
Nervous system / legs: Bird cannot stand or walks only with great difficulty; back legs are especially weak; bird may drag legs when moving
Nervous system / muscles: Bird has visible muscle twitches or spasms; in severe cases, head pulls back, neck arches abnormally
General behavior / feathers: Bird is inactive, fluffed up, and depressed; eats little or nothing
Eyes / vision: Bird does not respond to visual stimuli; eyes may roll or be unresponsive; bird may bump into objects
Nervous system / general: Bird experiences uncontrolled muscle contractions; may collapse suddenly; can be fatal if severe
Likely Causes
- Inadequate dietary thiamine in feed (poor-quality grains or improperly stored feed)
- Mold-contaminated feed containing thiaminase or toxins
- Antagonistic compounds in feed (thiaminases in raw fish meal or certain plant products)
- Heat degradation of thiamine during improper feed storage or processing
- Malabsorption from intestinal disease
- Stress increasing thiamine requirements
About This Condition
Body System Affected: Nervous system; thiamine is a cofactor in carbohydrate metabolism and neural function
Severity: serious
Contagious: No, not contagious
Affected Age Groups: chicks, pullets, hens, roosters
What to Do
Supplemental thiamine (Vitamin B1): inject 25-the appropriate amount intramuscularly or add to feed/water at 10-the appropriate amount/L. Signs may reverse within hours to days if caught early. However, severe or prolonged deficiency causes permanent brain damage. Provide quality feed; eliminate contaminated feed source.
When to See a Vet
If you see sudden onset of neurological signs (incoordination, paralysis, tremors, blindness) in one or multiple birds, contact a veterinarian immediately for the cause and thiamine injection.
Prevention
Use high-quality, properly stored grains and feed. Avoid mold-contaminated feed; store feed in cool, dry conditions. Avoid raw fish meal or ensure it is thiamine-fortified. Use quality commercial feed from reputable sources with proper vitamin supplementation. Do not feed spoiled or heat-damaged grains.
Frequently Asked Questions
Q1: Why is thiamine important for poultry?
Thiamine (Vitamin B1) is essential for energy production and nervous system function. The body cannot store thiamine long-term; birds require constant dietary intake. Deficiency causes metabolic failure and neurological damage (polioencephalomalacia).
Q2: What causes thiamine deficiency in backyard flocks?
Mold-contaminated feed or improper storage are common causes. Raw fish meal and certain plants contain thiaminase enzymes that break down thiamine. Poor-quality grain and heat-damaged feed from careless storage lose thiamine potency over time.
Q3: Can thiamine deficiency be reversed?
Yes, if caught EARLY. Supplemental thiamine (injected or fed) can reverse early neurological signs within hours to days. However, prolonged deficiency causes permanent brain damage (necrosis). Prevention through quality feed storage is far easier than treatment.