Evaluation of the preruminant calf as a model for the study of human carotenoid metabolism

C. L. Poor, T. L. Bierer, Neal R Merchen, G. C. Fahey, M. R. Murphy, J. W. Erdman

Research output: Contribution to journalArticlepeer-review

Abstract

This study evaluated the preruminant calf as an animal model for the study of human carotenoid metabolism. Fifteen newborn male Holstein calves were fed a carotenoid-free milk replacer diet to maintain them in the preruminant state. After a 7-d adjustment period, three calves were killed and 12 calves received a single oral dose (20 mg) of β-carotene in the form of water- soluble beadlets. Blood samples were collected periodically and samples of various tissues were collected when the calves were killed. Three animals each were killed by exsanguination at 1, 3, 6 and 11 d post-dosing. Serum β- carotene concentrations peaked between 12 and 30 h post-dosing and declined slowly afterwards. Serum data were fitted to a two-compartment model and yielded an elimination constant (k2) that was similar to reported human values. Adrenal tissue showed significant concentrations of β-carotene by 24 h post-dosing, and levels were still elevated at 264 h. Liver, spleen and lung β-carotene concentrations were significantly elevated by 24 h and rapidly declined thereafter. Adipose and kidney peak β-carotene concentrations were observed at 72 and 144 h, respectively. Heart and muscle did not display significant changes in β-carotene concentrations. The preruminant calf shows promise as an animal model for the study of absorption and metabolism of carotenoids by humans.

Original languageEnglish (US)
Pages (from-to)262-268
Number of pages7
JournalJournal of Nutrition
Volume122
Issue number2
DOIs
StatePublished - 1992

Keywords

  • absorption kinetics
  • animal models
  • beta-carotene
  • calves
  • vitamin A

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Nutrition and Dietetics

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