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Performance, Ruminal and Serum Characteristics of Steers Fed Lasalocid on Pasture^1,2,

North Carolina State University³, Raleigh 27650

Abstract

Seventy-two growing steers were used in a 126-d study to determine the influence of varying levels of lasalocid on performance, ruminal and serum characteristics of animals grazing pasture. Treatments consisted of: 1) control; 2) 200 mg lasalocid/d and 3) 300 mg lasalocid/d. Each treatment was replicated three times and each replicate of eight steers was maintained on 3.0 ha of pasture. Pastures consisted of a mixture of tall fescue, orchard grass and ladino clover. In addition to pasture, each replicate of steers was group fed ground corn at a rate of .91 kg-head^-1 •d^-1 with the lasalocid incorporated into the grain. Average daily gains were .50, .60 and .57 kg, respectively, for steers on the control, and for the 200 and 300 mg lasalocid treatments, which differed (P<.05) from controls. Ruminal acetate (mol/ 100 mol) was lower (P<.05) in steers fed lasalocid at 28 d, but similar for all treatments at 56 and 112 d. Molar proportion of propionate was higher (P<.05) and butyrate and valerate were lower (P<.10) in rumen fluid of steers receiving 200 or 300 mg/d of lasalocid. Plasma glucose concentrations were similar for controls and steers receiving 200 mg lasalocid/d, but higher (P<.05) in steers fed 300 mg lasalocid/d. Serum Mg concentrations were lower (P<.01) in steers receiving lasalocid. Potassium concentrations in serum were slightly lower (P<.01) in animals fed lasalocid at 112 d, but not at 28 or 56 d. Plasma urean and ruminal ammonian concentrations were not affected by treatment. Results indicate that lasalocid will increase gains and alter certain ruminal and serum characteristics in growing beef steers grazing pasture.

¹ Paper No. 8449 of the Journal Series of the North Carolina Agr. Res. Service, Raleigh. Use of specific products in this report does not imply endorsement by North Carolina Agr. Res. Service nor criticism of similar products.

² Supported in part by Hoffmann-LaRoche, Inc., Nutley, NJ.

³ Dept. of Anim. Sci.

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