Experimental Rickets in Broilers: Gross, Microscopic, and Radiographic Lesions. I. Phosphorus Deficiency and Calcium Excess

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Abstract
Day-old broiler chicks were fed diets high in Ca or low in P for 30 days. Chicks in both groups had similar gross, microscopic and radiographic lesions. At 2 wk, the growth-plate degenerating hypertrophied zone (DHZ) and metaphysical primary spongiosa were lengthened and decreased in radiopacity. Metaphysical vessels extended to the growth-plate hypertrophied zone (HZ), and osteoid seams were widened. At 3 and 4 wk, lesions were similar but folding fractures were common and cartilage columns of the metaphysis were thinned and replaced with increased woven bone.

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