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  • Title: The accumulation of alpha- and beta-carotene in serum and tissues of preruminant calves fed raw and steamed carrot slurries.
    Author: Poor CL, Bierer TL, Merchen NR, Fahey GC, Erdman JW.
    Journal: J Nutr; 1993 Jul; 123(7):1296-304. PubMed ID: 8320568.
    Abstract:
    The preruminant calf model was used to evaluate the effects of mild heat treatment on the serum and tissue accumulation of alpha- and beta-carotene from carrots. Twenty-four 1-wk-old Holstein male calves were assigned to one of four groups and fed a milk replacer diet. Negative control animals received no additional supplement. The three remaining groups received an additional 20 mg beta-carotene/d from either water-soluble beadlets, homogenized raw carrots or homogenized steamed carrots. Serum samples were obtained daily, and calves were killed after 7 d and samples of serum, liver and adrenal collected. Tissue and serum alpha- and beta-carotene concentrations were not significantly higher in steamed carrot-fed animals than in raw carrot-fed animals. The molar ratios of beta-carotene to alpha-carotene in both raw carrot-fed and steamed carrot-fed groups were highest in adrenal tissues, intermediate in serum and lowest in the diets. None of these differences were statistically significant. When the serum, liver and adrenal beta-carotene data were pooled, the mean relative accumulation of beta-carotene, expressed as a percentage of the mean response of calves receiving water-soluble beadlets, was 46.8% for calves fed raw carrots and 74.0% for calves fed steamed carrots. These results suggest a small enhancing effect of mild heat treatment of carrots on the serum and tissue accumulation of carotenoids.
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