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Intestinal radiocalcium absorption in the goat: measurement by a double-isotope technique

Published online by Cambridge University Press:  09 March 2007

Knut Hove
Knut Hove
Affiliation:
Department of Animal Nutrition, Agricultural University of Norway, 1432 Ås-NLH, Norway
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Abstract

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1. Intestinal radiocalcium absorption was measured in goats by a double-isotope technique involving injection of 45CaCl2 intravenously and 47CaCl2 into the abomasum. Cumulative absorption of radiocalcium was calculated by deconvolution analysis form curves of plasma radioactivity.

2. Repeated measurements at 2 d intervals gave highly reproducible results (r 0.94, P < 0.001). No systematic difference between two consecutive measurements was observed. A good agreement between absorption of radiocalcium from simultaneously administered 47CaCl2 and 45Ca-labelled hay (r 0.93, P < 0.001) seems to justify the use of inorganic 47Ca as a tracer for Ca in ruminant diets.

3. Two- to three-fold increases in radiocalcium absorption 48 h after oral treatment with 1,25- dihydroxycholecalciferol or leaves of Solanum malacoxylon showed the usefulness of the method in situations of rapidly changing Ca absorption.

4. Endogenous adaptations in intestinal radiocalcium absorption from 20 to 43% were observed in lactating goats when Ca intakes decreased from 12 to 4 g/d.

5. It is concluded that the double-isotope technique is a suitable method for studies of Ca absorption in ruminants when tracer is introduced into the abomasum. The test is completed in 3–4 h and may therefore be used in situations where the absorption of Ca undergoes rapid changes.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 51 , Issue 1 , January 1984 , pp. 145 - 156
Copyright
Copyright © The Nutrition Society 1984

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