"Field rickets" in turkey poults: field observations and pathological, radiological, and serological findings.

Two field cases of field rickets in turkey poults were studied. The primary observation was lameness, and the sole necropsy finding of significance was hypomineralization of bone. This finding was confirmed radiographically; thin cortices and wide growth plates were noted. Microscopically, there was failure of osteoid mineralization, failure of orderly progression from cartilage to bone in the growth plate, the formation of bony trabeculae perpendicular to the long axis of the bone, and fibroplasia in marrow spaces. On a routine serological screen for mycoplasma and several viruses, there were no differences between affected and normal poults from the same flock.