Selenium Deficiency is a chicken health condition. Selenium deficiency causes irreversible muscular degeneration and sudden death in young birds. Prevention through proper supplementation is critical; treatment of affected birds is largely supportive. Mortality can reach 10–30% in severely deficient flocks. This guide covers what to watch for, causes, treatment, and prevention strategies.
What It Looks Like
Watch for these signs:
Whole body: Chicks and growing birds fail to gain weight; remain smaller than healthy flock mates despite adequate feed intake
Muscles and nervous system: Bird stumbles, staggers, or has difficulty standing; hind legs may be paralyzed or dragged
Muscles: Upon post-mortem, skeletal and cardiac muscles appear pale, chalky, or whitish instead of normal pink-red (hence ‘white muscle disease’)
Heart: Heart muscle weakens; bird may die suddenly from heart failure
Subcutaneous tissues: Fluid collects under skin, especially in chest and wings; bird appears puffy or swollen; skin may appear bluish or pale
Whole body: Chicks may die suddenly from acute heart failure; mortality can be high in severely deficient flocks
Likely Causes
- Dietary selenium deficiency (feed
- Selenium is essential cofactor for glutathione peroxidase (antioxidant enzyme); deficiency impairs antioxidant defense
- Leads to accumulation of oxidative damage in muscle cells, particularly cardiac and skeletal muscle
- Vitamin E works synergistically with selenium; combined deficiency exacerbates white muscle disease
- Geographic regions with low soil selenium produce selenium-poor feed ingredients
- Chicks and fast-growing broilers most severely affected due to high metabolic demands
About This Condition
Body System Affected: Muscular system, immune system, and antioxidant defense; secondarily affects growth and reproduction
Severity: serious
Contagious: No, not contagious
Affected Age Groups: chicks, broilers, pullets
What to Do
No reversal of muscle damage is possible; focus on preventing further deterioration. Supplement feed with selenium (sodium selenite or selenomethionine) at 0.2–the appropriate amount, combined with vitamin E (50–the appropriate amount/kg feed) for synergistic protection. Provide supportive care: soft feed, adequate warmth, minimal stress handling. Affected birds with severe weakness or paralysis may require euthanasia. Injected selenium (sodium selenite, the appropriate amount/mL intramuscularly) may provide temporary improvement but does not reverse muscle damage.
When to See a Vet
Contact a veterinarian if multiple chicks or young birds show poor growth, muscle weakness, or sudden death. Plasma selenium levels Use commercial feed formulated for poultry with adequate selenium (0.2–the appropriate amount) and vitamin E supplementation. If formulating feed, include selenium from reputable premixes or mineral supplements. Provide adequate vitamin E from feed sources (wheat germ, vegetable oils) or synthetic supplements. Test feed for selenium content if deficiency is suspected; work with feed supplier to ensure proper supplementation. Selenium deficiency is less common in commercial flocks (due to feed supplementation) but can occur in backyard flocks using poor-quality or home-mixed feed. Geographic regions with naturally low soil selenium are at higher risk. No; human supplements are not formulated for poultry and may cause overdosing. Use only poultry-specific mineral premixes or feed formulated with proper selenium levels (0.2–the appropriate amount). No; muscle damage from selenium deficiency is irreversible. Supplementation prevents further deterioration but does not restore lost muscle. Recovery depends on stopping ongoing damage early.Prevention
Frequently Asked Questions
Q1: Is selenium deficiency common in backyard flocks?
Q2: Can I supplement selenium with human supplements?
Q3: Will affected birds recover if I supplement selenium now?