Dark-cutting carcasses, generally caused by stress, result in discounts averaging about $20 per hundredweight at the packing plant. Colorado State University animal scientist Temple Grandin notes that cattle from certain feedyards produce higher-than-average numbers of dark-cutting carcasses, and she suggests a possible solution. At some operations, she says, cattle rarely or never see a person on foot until they reach the packing plant. As a result, unloading and processing at the packing plant becomes far more stressful than necessary. Walking cattle occasionally during the feeding period, she suggests, can help prepare them for future experiences with people who are not on horseback.