Studies of the Onset Period of Osteochondrosis in Pigs

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  • ブタ骨軟骨症の発生時期に関する研究
  • ブタ コツナンコツショウ ノ ハッセイ ジキ ニ カンスル ケンキュウ

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Abstract

In order to elucidate the period and mechanism of the onset of osteochondrosis in pigs, changes in the articular cartilage of the distal end of the femur and epiphysial cartilage of the distal end of the ulna were observed by means of soft X-rays and by histological means during 1 to 6 months of age. Wide incomplete calcifying areas were radiographically observed in the subcartilaginous bones of the articular cartilage at 3 months old, and the epiphysial cartilage at 4 months old. Lesions including necrosis of cartilage cells were histologically observed in the articular and epiphysial cartilages at 1 month old. These lesions advanced with age. Osteochondrosis-specific symptoms, mainly incomplete ossification symptoms such as wide necrosis of cartilage cells, cracking in cartilage matrix, disappearane of subcartilaginous bones and proliferation of connective tissues, were observed in the articular cartilage at 3 months old and in the epiphysial cartilage at 4 months old. These results indicate that osteochondrosis in pigs occurs a few months after birth.

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