Vitamin B_<12> Balance in Coprophagy-Prevented Rats

DOI Web Site 13 References
  • Kurosawa Akira
    Department of Animal Science, Tokyo University of Agriculture
  • Ikeda Shuhei
    Department of Animal Science, Tokyo University of Agriculture
  • Sawada Kana
    Department of Home Economics, Hokkaido University of Education, Sappro Campus
  • Yamada Keiko
    Center for Medical Education, Sapporo Medical University
  • Fukuda Morimichi
    Doushi-Kai Clinic, Motomachi Medical Building
  • Yamada Shoji
    Department of Home Economics, Hokkaido University of Education, Sappro Campus
  • Sukemori Seizi
    Department of Animal Science, Tokyo University of Agriculture

Bibliographic Information

Other Title
  • ラットの食糞行動によるビタミンB_<12>の出納
  • ラット ノ ショク フン コウドウ ニ ヨル ビタミン B12 ノ スイトウ

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Abstract

This study examined the relationship between Vitamin B_<12> (B_<12>) synthesized from Cobalt (Co) in the diet and actual excreted B_<12> in coprophagy-prevented or allowed rats fed either a commercial diet (B_<12>: 170μg/kg, Co: 1380μg/kg) or a purified diet (B_<12>: 25μg/kg, Co: 1.09μg/kg contain in B_<12>). Twelve healthy Sprague-Dawley strain male rats age 4 weeks were used in this experiment. Coprophagy was prevented for the first 4 weeks, then allowed for the following 7 days. We found that B_<12> excretion was greater than B_<12> intake in each diet group, and coprophagy-allowed rats excreted larger amounts of B_<12> than coprophagy-prevented ones. This suggests that for large Co intake in rats, synthesizable-B_<12> from Co-intake is excreted. However, for small Co-intake, the entire Co-intake was used by intestinal microorganisms in synthesizing B_<12>, but excreted even if it was insufficient.

Journal

  • VITAMINS

    VITAMINS 84 (2), 47-52, 2010

    THE VITAMIN SOCIETY OF JAPAN

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