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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
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
Copyright
Copyright © The Nutrition Society 1983

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