J. Anim Sci.
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J. Anim Sci. 1988. 66:2987-2991.
© 1988 American Society of Animal Science
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Site and Extent of Apparent Magnesium and Calcium Absorption in Steers Fed Monensin1,2,

L. W. Greene3, B. J. May4, G. T. Schelling3 and F. M. Byers3

Texas Agricultural Experiment Station and Texas A&M University College Station 77843

Abstract

Eight crossbred steers (avg wt, 350 kg) with duodenal and ileal cannulas were used in two experimental periods in a single-reversal design to determine the effects of monensin on site and extent of apparent absorption of Mg and Ca. Steers were fed a cottonseed hull:concentrate diet (30:70) with or without 25 mg monensin/kg. The diet contained .20% Mg and .38% Ca. Each diet contained .25% Cr2O3 as a digesta marker. During each period, steers were fed the control diet for 10 d before allotment to treatments. Each period consisted of 17 d for diet adjustment and 6 d for collection. During the collection phase, fecal samples were obtained beginning on d 1 and continuing through d 6 at 12-h intervals progressing 2 h each day. Apparent Mg availability (grams apparently absorbed expressed as a percentage of grams of intake) increased (P < .05) from 18.4 to 32.5% when monensin was fed. Feeding monensin increased (P < .05) the apparent Mg availability and amount of Mg absorbed in the preintestinal region (47.7 vs 29.8% and 8.5 vs 5.1 g/d, respectively). Larger quantities (P < .05) of Mg were secreted into the small intestine when monensin was fed. Monensin did not alter (P < .05) apparent Ca availability or absorption in any segment of the digestive tract. These data indicate that monensin increased Mg and did not change Ca availability in the preintestinal region.

Footnotes

1 Journal paper TA. 23351, Texas Agric. Exp. Sta.

2 Reference to a company or trade name does not imply approval or endorsement by the Texas Agric. Exp. Sta.

3 Dept. of Anim. Sci.

4 Current address: Mohair Council of America, San Angelo, TX.






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Copyright © 1988 by the American Society of Animal Science.