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Zinc deficiency and peripheral neuropathy in chicks
B L O'Dell1, J Conley-Harrison, J D Browning
1Department of Biochemistry, University of Missouri, Columbia 65211.
Summary
Zinc deficiency in chicks causes a neuromuscular disorder affecting gait and posture. Electrophysiologic studies revealed peripheral neuropathy, with nerve conduction velocity significantly impaired in deficient chicks.
Area of Science:
- Animal Science
- Neuroscience
- Nutritional Science
Background:
- Zinc deficiency in young animals can lead to developmental and neurological issues.
- Chicks with zinc deficiency exhibit motor impairments, including abnormal gait and posture.
Purpose of the Study:
- To investigate the underlying cause of the neuromuscular disorder observed in zinc-deficient chicks.
- To assess peripheral nerve function using electrophysiologic measurements.
Main Methods:
- Chicks were fed either a low-zinc (6 mg/kg) or zinc-adequate (50 mg/kg) diet for three weeks.
- Sciatic nerve function was evaluated in vivo using an electrodiagnostic system.
- Zinc repletion was performed in a subset of chicks to assess reversibility of effects.
Main Results:
- Motor nerve conduction velocity was significantly reduced in chicks fed the low-zinc diet compared to controls.
- Clinical signs of the neuromuscular disorder were reversed following two weeks of zinc repletion.
- Nerve conduction velocity normalized after two weeks of repletion, but not after one week, indicating a time-dependent recovery.
Conclusions:
- The study concludes that the abnormal posture and locomotion in zinc-deficient chicks are linked to peripheral neuropathy.
- Zinc is crucial for maintaining normal peripheral nerve function in developing chicks.