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Calcium metabolism in lactating ewes

Published online by Cambridge University Press:  09 March 2007

G. D. Braithwaite ,
R. F. Glascock  and
Sh. Riazuddin
G. D. Braithwaite
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
R. F. Glascock
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
Sh. Riazuddin
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading
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Abstract

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1. A combination of balance and isotope techniques has been used to study calcium metabolism at different stages of lactation in six sheep and the results have been compared with those obtained from four of the sheep 1 month after the end of lactation.

2. At first the animals were in negative Ca balance but, as milk yields decreased, so the animals moved progressively into positive balance.

3. Ca absorption from the gut was significantly increased throughout the whole of lactation but not sufficiently to meet the initial high demands for Ca.

4. Most of the extra Ca was supplied by bone resorption which was high in early lactation and decreased to a very low value at the end.

5. The rate of bone accretion remained constant throughout the period and was 1.5 times as high as in the non-lactating animals.

6. In the later stages, a combination of factors, but in particular a low rate of resorption of bone, enabled the animals to replenish some of the Ca lost from the skeleton in early lactation.

7. A month after the end of lactation replenishment of skeletal stores of Ca was still continuing as shown by the excess of bone accretion over bone resorption.

Type
Research Article
Information
British Journal of Nutrition , Volume 23 , Issue 4 , November 1969 , pp. 827 - 834
Copyright
Copyright © The Nutrition Society 1969

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