Fig. 3

Mean plasma cortisol stress response from 40 min to 150 min relative to exogenous adrenocorticotropic (ACTH) administration (1.98 IU/kg metabolic BW^0.75) in beef heifers differing in phenotypic residual feed intake (RFI). The values are expressed as Lsmeans with SEM. RFI, P = 0.006. SEM: High RFI = 0.57; Low RFI = 0.52