日本の肉用種若鶏に自然発生したビタミンD<SUB>3</SUB>欠乏性クル病の病理

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  • Pathology of naturally occurring vitamin D3-deficient rickets in growing broiler chickens in Japan.
  • 日本の肉用種若鶏に自然発生したビタミンD3欠乏性クル病の病理〔英文〕
  • ニホン ノ ニクヨウシュ ワカドリ ニ シゼン ハッセイシタ ビタミン D3

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Bones and parathyroid glands of 48 broiler chickens from 28 to 69 days of age, naturally affected with rickets, were pathologically studied. Main gross lesions were stunting of the skeletal growth, enlargement at the caput costae, hypertrophy of all the bones and enlargement of the parathyroid glands. Histopathologic lesions of the bones were roughly divided into three stages taking into consideration the developmental process. Stage I of the lesions was the initial alteration consisting of mild widening of the hypertrophic zone. In stage II there were marked widening of the hypertrophic zone with considerable endochondral ossification, a moderate degree of endosteal osteogenesis with osteoclastic resorptions in the marrow cavity, and frequent periosteal osteogenesis and demineralization in the cortex. In stage III most portions of the hypertrophic zone were replaced by osteoid trabeculae and the proliferating zone was widened. Endosteal osteogenesis was conspicuous and extensive areas of the marrow cavity were occupied with abnormal osteogenous tissue. All the parathyroid glands examined showed histopathologic features of hyperparathyroidism consisting of swelling and hyperplasia of chief cells. It was concluded that the bone lesions in rickets of growing broiler chickens varied with time and there was a close relationship between formation of the bone lesions and hyper-parathyroidism. Etiologically, this condition might be due to vitamin D3 deficiency in the feed.

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