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Journal of Dairy Science Vol. 82 No. 8 1824-1830
© 1999 by American Dairy Science Association ®
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Effects of Intrinsic Potassium in Artificially Dried Grass and Supplemental Potassium Bicarbonate on Apparent Magnesium Absorption in Dry Cows

J. T. Schonewille 1, A. T. Van'T Klooster 1, H. Wouterse 1, and A. C. Beynen 1

1 Department of Nutrition, Faculty of Veterinary Medicine, Utrecht University, PO Box 80.152, 3508 TD Utrecht, The Netherlands

Literature data indicate that the form of K in the ration can affect its inhibitory influence on Mg absorption in ruminants. We tested whether identical amounts of K either intrinsically present in artificially dried grass or present in added KHCO3 have different effects on Mg absorption in dry cows. In a 3 x 3 Latin square design, six cows were fed rations consisting of low-K grass and concentrate with or without KHCO3 or a ration consisting of high-K grass with concentrate without added KHCO3. Each ration was given for a period of 4 wk. The ration low in intrinsic K contained 26 g of K/kg of dry matter, the ration low in intrinsic K plus KHCO3 contained 43 g of K/kg of dry matter, and the ration high in intrinsic K also contained 43 g of K/kg of dry matter. The three rations were balanced for crude protein, crude fat, crude fiber, Mg (2.2 g/kg of dry matter), Ca, P, and Na. Apparent Mg absorption was 10.8 ± 1.54% of intake (mean ± SE, n = 6) when the cows were fed the low-K ration, but dropped to 1.9 ± 3.4 and 2.1 ± 1.9% of intake, respectively, when the rations high in KHCO3 and high in intrinsic K were fed. The two high-K rations induced similar increases in ruminal K concentrations both before and after feed consumption. The feeding of KHCO3 did not influence ruminal pH. The intake of extra K may raise ruminal K concentrations, which increases the transmural potential difference so that Mg transport across the rumen epithelium becomes depressed. Thus, intrinsic and added K had identical effects on ruminal K concentrations and on Mg absorption. Feeding trials with ruminants in which K intakes are manipulated with the use of KHCO3 may reflect those cases when concentrations of K intrinsically present in feedstuffs may vary.

Key Words: magnesium • potassium • cows • absorption

Submitted on December 15, 1998
Accepted on April 16, 1999




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