J. Anim Sci.
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J. Anim Sci. 1985. 60:1479-1484.
© 1985 American Society of Animal Science
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Effects of Monensin on Monovalent Ion Metabolism and Tissue Concentrations in Lambs1,2,

D. J. Kirk3, L. W. Greene, G. T. Schelling and F. M. Byers

Texas A&M University4, College Station 77843

Abstract

A study consisting of two trials was conducted to determine the effects of monensin on the apparent absorption and retention of sodium (Na) and potassium (K) and to examine changes in tissue and ruminal fluid concentrations of these minerals in lambs. Eight lambs (39 kg) were used in trial 1 and 10 lambs (37 kg) were used in trial 2. Animals were used in randomized block designs, blocked by weight, and fed a high concentrate diet with or without 20 mg/kg monensin. Trials began with a dietary adjustment period lasting 18 d in trial 1 and 21 d in trial 2. Animals were then placed in metabolism stalls for a 10-d stall adjustment period followed by a 12-d collection period. Collections for mineral balance were made during the first 10 d of the collection period. Blood and ruminal fluid samples were obtained on d 11 of the collection period. Lambs were slaughtered on d 12 of the collection period and tissue samples were collected. Sodium retention decreased (P<.05) 86.2% when monensin was fed. Apparent K absorption increased (P<.05) 16.7%, while K retention increased (P<.10) 52.6% when monensin was fed. In lambs fed monensin, ileal Na decreased (P<.10) 13.8%. These results indicate that dietary monensin alters the metabolism of Na and K in lambs.

Footnotes

1 Journal paper TA. 19929. Texas Agr. Exp. Sta.

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

3 Present address: Dept. of Anim. Sci., Virginia Polytechnic Institute and State Univ.

4 Dept. of Anim. Sci.






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Copyright © 1985 by the American Society of Animal Science.