Abstract
The incidence and degree of scoliosis were investigated in broiler chickens with and without intertarsal deformities associated with slipped gastrocnemius tendons. In both groups, the incidence of scoliosis was similar and there was a significant tendency for scoliosis to be convex on the right side. However, scoliosis was significantly greater in birds with intertarsal deformities, and in a significant proportion of these the joint with a slipped tendon was on the convex side of scoliosis. In birds with deformities, inequalities between right and left tibiotarsi were significantly greater, and tibiotarsi with greater length, narrower condyles and trochleae, and shallower trochlear grooves were significantly more often on the convex side of scoliosis. Significant positive correlations were found between scoliosis and rotational and bending deformities of the distal tibiotarsus on the convex side of scoliosis. These findings suggest a cause-and-effect relationship between scoliosis and tibiotarsal deformities associated with slipped tendons.
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