What it looks like
Poor feathering or abnormal feather pigmentation — Feathers appear thin, short, or bleached (loss of normal color); plumage looks abnormal
Depigmentation and color loss — Normally pigmented breeds show loss of color; black breeds may appear faded or brown
Incoordination and ataxia — Difficulty walking, stumbling, loss of balance; may walk with swaying motion
Skeletal deformities (severe cases) — Bowed or twisted legs; swollen joints; increased bone fragility
Poor growth and reduced feed conversion — Birds fail to grow at normal rate; feed efficiency is reduced
Anemia (in severe cases) — Pale comb and mucous membranes; indicates reduced red blood cell production
Increased susceptibility to infection — Birds show more frequent or severe infections; wounds heal poorly
Likely causes
- Inadequate dietary copper (mineral deficiency in feed formulation)
- High dietary zinc or iron interference reducing copper absorption
- Certain feedstuffs (e.g., legume hay) with poor copper availability
- Feeding regimens missing mineral premix
- Young growing birds or high-producing layers with increased copper demands
What to do
Switch immediately to commercial poultry feed meeting NRC copper requirements. If formulating your own feed, include a vitamin/mineral premix providing adequate copper. Affected birds recover quickly from nutritional deficiency once diet is corrected. Severely affected birds (with skeletal deformities) may have permanent damage.
When to see a vet
See a vet if your bird shows severe signs or doesn’t improve within a few days of treatment.
Prevention
Use high-quality commercial poultry feeds formulated to meet NRC nutrient standards. If mixing your own feed, ensure inclusion of a complete vitamin/mineral premix. Avoid excessive zinc or iron supplementation that would interfere with copper absorption. Monitor bird growth and feathering to detect deficiencies early.
Frequently asked questions
What does copper do in chickens?
Copper is essential for collagen cross-linking (skeletal and connective tissue strength), myelin formation (nerve insulation), iron metabolism, and immune function. Without adequate copper, birds develop poor feathering, weak bones, and neurological problems.
What are good sources of copper in feed?
Copper is found in trace amounts in most feedstuffs; commercial feeds include copper sulfate or copper oxide as supplement. Vitamin/mineral premixes provide adequate copper when used at recommended rates.
Can copper deficiency cause leg problems?
Yes, copper deficiency can cause skeletal deformities, bone fragility, and incoordination. These problems result from defective collagen and myelin formation. Combined deficiency of copper and other minerals (manganese, zinc) may worsen skeletal problems.
How quickly does dietary correction fix copper deficiency?
Nutritional signs (poor feathering, incoordination) improve within 1-2 weeks of switching to proper diet. Skeletal deformities are permanent if severe. Prevention is far superior to treatment.
Can excessive zinc or iron cause copper deficiency?
Yes, high dietary zinc or iron competes with copper for absorption, potentially triggering copper deficiency even when dietary copper is adequate. Balance between minerals is important.