低タンパク質または低カロリー飼料摂取が子牛の骨成長ならびに骨代謝に及ぼす影響

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  • Effect of Protein and/or Calorie Malnutrition on Growth and Metabolism of Bone in Calves
  • テイ タンパクシツ マタハ テイ カロリー シリョウ セッシュ ガ コウシ

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This study was conducted to investigate the effect of protein and/or calorie malnutrition on bone growth in calves. Ten calves weighing 130-140kg were sed. At the beginning of experiment, 2 calves were killed and the other animals were divided into 4 groups as follows, 1) NN (DCP 12%, TDN 78%), 2) LC (DCP 12%, TDN 60%), 3) LP (DCP 5.5% TDN 78%) and 4) LL (DCP 5.5% TDN 58%). After 12 weeks of this experiment, all calves were killed and the tibia and mandible were collected. The body weight gain was less in LC than in NN and more than in LP and LL. The length and width of both mandible and tibia and the cortical width of the tibia were less in malnourished groups than those in NN. Bone mineral contents and bone density did not change, but bone alkaline and acid phosphatase activities were reduced in malnourished groups. The serum growth hormone (GH) concentration did not change in each group, but the serum total thyroxine concentration decreased in malnourished groups, which might retard bone growth in calves.

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