Occurrence: About 1% of all heavy meat type birds reared around the world have some degrees of this disease.
Species affected: Broilers and turkeys
Age affected: 5 to 8 week old
Causes: This disease is not contagious. Genetic and/or dietary (cation ‑ anion ratio) of the ration or high phosphorus relative to calcium) factors may be involved. Grain high in Fusarium roseum or fungicide (tetra methylthiuram sulfate) can cause the disease.
Effects: Lameness in as many of 30% of the flock (reluctance to move, a stilted gait, and
bilateral swelling of the femoral‑tibial joints) can be seen. Leeds to trimming and downgrading in processing plant.