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The relative biological potencies of retinyl palmitate and β-carotene for the milk-fed lamb

Published online by Cambridge University Press:  09 March 2007

O. Faruque  and
D. M. Walker
O. Faruque
Affiliation:
Department of Animal Husbandry, University of Sydney, Australia
D. M. Walker
Affiliation:
Department of Animal Husbandry, University of Sydney, Australia
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Abstract

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1. Thirty-four cross-bred newborn lambs were used. A high-protein diet (25% protein calories) was supplemented daily with retinyl palmitate (range, 13.75–440 μg/kg live weight 24 h), or with β-carotene (range, 68.5–2200 μg/kg live weight 24 h) for 21 days.

2. Live-weight gain was not increased by supplementing the basal diet with either retinyl palmitate or β-carotene.

3. The relative weights of β-carotene and retinyl palmitate (expressed as retinol) that were required to produce equivalent concentrations of retinol in the serum varied from 5:1 to 25:1, and for the liver (retinal + retinyl esters, expressed as retinol) the ratio varied from 3:1 to 9:1.

Type
Research Article
Information
British Journal of Nutrition , Volume 24 , Issue 1 , March 1970 , pp. 23 - 28
Copyright
Copyright © The Nutrition Society 1970

References

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