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Studies on magnesium in ruminant nutrition

8.* Effect of increased intakes of potassium and water on the metabolism of magnesium, phosphorus, sodium, potassium and calcium in sheep

Published online by Cambridge University Press:  09 March 2007

N. F. Suttle  and
A. C. Field
N. F. Suttle
Affiliation:
Moredun Institute, Edinburgh 9
A. C. Field
Affiliation:
Moredun Institute, Edinburgh 9
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Abstract

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1. In expt 1 daily supplements of 0 or 27–28 g potassium, with 0 or 7·5 1. water, were given to each of eight fistulated wether sheep on a hay and concentrate diet in two 4 × 4 latin square experiments. Faeces were collected for the last 4 days of, and urine throughout, 10-day treatment periods.

2. Adding K to the diet decreased the urinary output of magnesium by 33% (P < 0·001) and significantly increased those of phosphorus, sodium and calcium by 98, 76 and 150%, respectively. Faecal outputs of Mg and K were increased, whereas that of P was decreased. The retentions of P and Na tended to be decreased, whereas that of K was increased (P < 0·001). Mg in serum was decreased by 0·4 mg/100 ml (P < 0·05) and K increased by 4·9 mg/100 ml (P < 0·001).

3. Increasing the water intake increased the urinary outputs of Mg, P, Na and Ca by 33, 165, 47 and 200%. The faecal output of Ca was increased and the retentions of Mg, P and Ca were decreased (P < 0·01).

4. The effects of water and K were generally independent, but interactions affected the urinary outputs of P and K and the retention of K.

5. The increases in urinary Na output were three- and eight-fold greater during the first 3 days of increased water and K intakes than during the balance study.

6. In expt 2, mineral balance studies were conducted before and after supplementing the diet with potassium acetate, using five wethers from Expt 1. K intakes were similar to those of Expt 1. The effects of potassium acetate and KCl were generally similar qualitatively but the acetate produced greater decreases in urinary Mg and faecal P outputs and greater increases in urinary Na and K outputs than KCl. K in serum was increased by 28 mg/100 ml but Mg was not affected.

7. The nature of these responses in discussed with particular reference to the aetiology of hypomagnesaemic tetany.

Type
Research Article
Information
British Journal of Nutrition , Volume 21 , Issue 4 , December 1967 , pp. 819 - 831
Copyright
Copyright © The Nutrition Society 1967

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