削蹄による肥育用黒毛和種牛の蹄形,蹄病発生および生産性の変化 [in Japanese] Effects of Trimming on Hoof Growth, Hoof-disease Occurrence, and Productivity in Japanese Black Beef Cattle [in Japanese]
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肥育牛における蹄の生長, 蹄疾患の発生や生産性と削蹄との関係について検討した. 肥育期の黒毛和種16頭 (13.0±2.0カ月齢, 体重308.0±30.8kg, 去勢牛) を削蹄間隔により3, 6および12カ月削蹄群ならびに無削蹄群の4群に分け, 以後19カ月間, 蹄計測, 蹄形の変化を記録した. と殺後, 蹄病変を観察し, 枝肉成績を記録した. 削蹄間隔の延長に伴い, 蹄角度は小さく, 蹄壁・蹄踵長は長くなった. 12カ月削蹄群および無削蹄群では蹄の変形が進み, 伸びた蹄踵で負重するようになった. 白帯離解の発生頻度は無削蹄群で有意に高かった (P<0.05). 歩留基準値は, 6カ月削蹄群が12カ月および無削蹄群と比較して有意に高い値を示し (P<0.05), 産肉量が向上していた.本研究結果から, 削蹄間隔を6カ月とすることで, 標準蹄に近い蹄形が維持され, 蹄病変の発生抑制と産肉量向上に役立つことが明らかとなった.
This study was designed to determine effects of trimming on hoof growth, hoof-disease occurrence, and beef productivity. Sixteen Japanese black steers (13.0±2.0 months of age, 308.0±30.8 kg in body weight) were divided into 4 groups: the no-trimming group and group 2; in which trimming was performed at 3-month intervals; group 3, in which trimming was performed at 6-month intervals; and group 4, in which trimming was performed at 12month-intervals. At 19-month intervals, hooves were measured and hoof appearance recorded.After slaughter, we made pathological investigations of hoof and joint diseases and obtained scores representing the quantity and quality of beef products. When trimming intervals were longer, hoof angle was smaller, and hoof wall and bulb height increased. The occurrence of hoof diseases in the no-trimming group was significantly higher (P<0.05) than in the other groups. Scores for beef-product quantity were significantly higher (P<0.05) in group 3, in which trimming was performed at 6-month intervals, than in the other groups. These results suggest that trimming may be useful in maintaining normal hoof growth and preventing deformation and disease.
- Journal of the Japan Veterinary Medical Association
Journal of the Japan Veterinary Medical Association 54(11), 829-836, 2001-11-20
Japan Veterinary Medical Association