Armstrong Memorial Research and Demonstration Farm

Effect of MGA on Performance, Sexual Behavior, Carcass Quality and Tenderness in Mixed-Sex Pens of Cattle

Authors: Darrell Busby (Iowa State University) , Daniel D. Loy (Iowa State University) , Gene H. Rouse (Iowa State University) , Dallas L. Maxwell (Iowa State University)

  • Effect of MGA on Performance, Sexual Behavior, Carcass Quality and Tenderness in Mixed-Sex Pens of Cattle

    Armstrong Memorial Research and Demonstration Farm

    Effect of MGA on Performance, Sexual Behavior, Carcass Quality and Tenderness in Mixed-Sex Pens of Cattle

    Authors: , , ,

Abstract

The effect of MGA in mixed pens of steers and heifers was evaluated over a three-year period at the ISU Armstrong Research Farm near Lewis, Iowa. Two pens of approximately 40 head were fed diets with or without MGA in each of three replications. Estrus and riding activity was monitored using the Heat Watch system. At slaughter, in addition to routine carcass data collection, a rib sample was collected from each carcass for tenderness evaluation. There was no effect on dry matter intake due to MGA treatment. Mixed-sex pens that were fed MGA were 4% more efficient than controls. MGA-fed steers gained similarly to control steers. MGA fed heifers gained 8% faster than control heifers. MGA highly reduced measures of estrus and riding activity throughout the feeding period. MGA feeding improved marbling and tenderness measured in both steers and heifers. These data suggest that MGA has potential to improve performance, quality grade, and tenderness in mixed pens of steers and heifers.

Keywords: Agronomy

How to Cite:

Busby, D., Loy, D. D., Rouse, G. H. & Maxwell, D. L., (2001) “Effect of MGA on Performance, Sexual Behavior, Carcass Quality and Tenderness in Mixed-Sex Pens of Cattle”, Iowa State University Research and Demonstration Farms Progress Reports 2000(1).

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Published on
01 Jan 2001
Peer Reviewed