Besides, cathepsin B and L concentrations in the longissimus muscle on L and 8 days post-mortem were also lowerin BBDM bulls. These results were not confirmed by Caballero who found that the activity of cathepsins B,B+,L,D and H in the cytosolic compartment of the longissimus muscle was higher in DM bulls of the Asturiana de los Valles breed at 3 and 7 days post-mortem than in non-DM animals enzyme activity tended to be lower in DM animals with significant differences for cathepsin D, meaning that the tenderisation rate was faster in DM animals