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Saturation kinetics of magnesium efflux across the rumen wall in heifers

Published online by Cambridge University Press:  09 March 2007

H. Martens
H. Martens
Affiliation:
Department of Physiology, School of Veterinary Medicine, Bischofsholer Damm 15, D-3000 Hannover 1, West Germany
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Abstract

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1. Absorption of magnesium from the temporarily-isolated, emptied and washed rumen of four 10–12-month-old heifers was measured at five different Mg concentrations (2·5, 5·0, 7·5, 12·5 and 20 mmol/l).

2. Net absorption of Mg was observed at all concentrations. Saturation occurred at a concentration of 12·5 mmol Mg/l.

3. Using an Eadie–Hofstee plot, the Michaelis–Menten constant (Km; 11·43 mmol/l) and maximal efflux (Vmax; 120·3 μmol/min) were estimated.

4. The phenomenon of saturation supports the assumption that Mg transport across the rumen wall of heifers is an active process.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 49 , Issue 1 , January 1983 , pp. 153 - 158
Copyright
Copyright © The Nutrition Society 1983

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