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Effects of Lysocellin on Performance, Ruminal and Plasma Characteristics of Growing Cattle^1,2

North Carolina State University, Raleigh 27695-7621 and Pitman-Moore, Inc., Terre Haute, IN 47808

Abstract

Twenty-four Hereford steers averaging 228 kg initially were used to evaluate four levels of lysocellin (0, 11, 22 and 33 mg/kg diet) when individually fed a corn silage-based diet. Gains were similar for all lysocellin levels over the 112-d study. As lysocellin level increased, there was a linear decrease in dry matter intake and an improvement in feed conversion (P < .05). Feed to gain ratios were 6.27, 6.14, 5.67 and 5.59 for the 0, 11, 22 and 33 mg/kg of lysocellin treatments, respectively. Molar proportion of acetate was lower (P < .05) and propionate was higher (P < .05) for steers fed lysocellin than for controls at d 84. Ruminal fluid concentrations of soluble Cu and Zn were higher (P < .05) in steers fed lysocellin at 28 and 84 d and increased as lysocellin level increased. Plasma Zn was lower (P < .05) at both 28 and 84 d in steers fed lysocellin, whereas plasma Cu concentrations were similar for controls and for those fed lysocellin. Both ruminal fluid soluble P and plasma P concentrations were higher (P < .05) in steers fed lysocellin than in controls at d 84. These results are interpreted to indicate that feed conversion of growing cattle is improved by lysocellin and that metabolism of certain minerals is affected by this ionophore.

¹ Paper No. 11075 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh 27695-7601. Use of trade names in this publication does not imply endorsement by the North Carolina Agric. Res. Serv. of the products named, nor criticism of similar ones not mentioned.

² Acknowledgment is given to Pitman-Moore, Inc., Terre Haute, IN 47808 for supplying the Lysocellin for this study.

³ Dept. of Anim. Sci.

⁴ Res. and Development, Pitman-Moore, Inc., Terre Haute, IN 47808.