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Lasalocid and Dietary Sodium and Potassium Effects on Mineral Metabolism, Ruminal Volatile Fatty Acids and Performance of Finishing Steers¹

North Carolina State University², Raleigh 27695-7621

Abstract

Thirty Angus steers averaging 357 kg were used to: 1) determine the effect of feeding lasalocid (33 mg/kg diet) on mineral metabolism and 2) determine the effects of varying dietary sodium (Na) and potassium (K) on finishing steers fed lasalocid. Treatments consisted of: 1) control (.25% Na, .5% K); 2) lasalocid (.05% Na, .5% K); 3) lasalocid (.25% Na, .5% K); 4) lasalocid (.05% Na, 1.4% K) and 5) lasalocid (.25% Na, 1.4% K). Ruminal fluid and blood samples were collected on d 28 and 90 of the 102-d study. Gain and feed conversion tended to be higher for steers fed lasalocid with the exception of the .05% Na, 1.4% K treatment. Control steers had lower (P<.05) erythrocyte K concentrations, reduced (P<.05) soluble concentrations of magnesium and copper in ruminal fluid and decreased plasma concentrations of zinc (P<.05) and phosphorus (P<.10) at 90 d compared with steers fed lasalocid and similar concentrations of Na (.25%) and K (.5%). Increasing dietary Na from .05 to .25% in the presence of lasalocid increased (P<.05) molar proportion of ruminal acetate at 28 and 90 d and reduced (P<.05) propionate at 90 d. Increasing K from .5 to 1.4% decreased (P<.01) soluble Na and increased (P<.01) soluble K concentrations in ruminal fluid. Steers fed lasalocid (.25% Na, .5% K) had lower concentrations of K (P<.10) and zinc (P<.10) in liver than control steers. Sodium and K level also affected tissue concentrations of certain minerals. Results suggest that dietary Na and K influence mineral metabolism and that dietary Na affects ruminal molar proportion of acetate in cattle fed lasalocid.

¹ Paper no. 10887 of the Journal Series of the North Carolina Agr. Res. Serv., Raleigh, NC 27695-7601. Use of trade names in this publication does not imply endorsement by the North Carolina Agr. Res. Serv. nor criticism of similar products not mentioned.

² Dept. of Anim. Sci.