Department of Animal Science


Date of this Version



Published in 2013 Nebraska Beef Cattle Report.


Copyright © 2013 The Board of Regents of the University of Nebraska. Used by permission. All rights reserved.


Strip loins from steers with genotypes containing zero, one, or two copies of the inactive myostatin mutation (IM) (n = 20, 22, and 16, respectively) were obtained. Loins were cut into 1-inch steaks where total number of steaks and total numbers of steaks with gluteus medius (often called vein steaks) were noted. Loins from zero copy cattle had a higher total number of steaks, but no difference in proportion of steaks, both with and without the gluteus medius compared to one and two copy cattle. This study indicates that increasing copies of the IM mutation has no impact on the proportion of steaks containing the gluteus medius muscle within the strip loin.