Effect of ractopamine-hydrochloride on the fiber type distribution and shelf-life of six muscles of steers.

  title={Effect of ractopamine-hydrochloride on the fiber type distribution and shelf-life of six muscles of steers.},
  author={J. m. Gonzalez and Sally E Johnson and Todd A. Thrift and Jesse Savell and S E Ouellette and D. Dwain Johnson},
  journal={Journal of animal science},
  volume={87 5},
The goal of this study was to evaluate the effects of ractopamine-hydrochloride (RAC) supplementation on the myosin heavy chain isoform distribution and shelf-life properties of muscles from beef top round, knuckle, and loin. Thirty-four steer carcasses were selected from 4 separate slaughter groups. Within each slaughter group (3 groups, n = 8; 1 group, n = 10), steers were separated into pens (n = 8) and fed 0 or 200 mg x animal(-1) x d(-1) of RAC for the final 28 d of feeding. Seventy-two… 

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