Fig. 1
Effect of exogenous adrenocorticotropic (ACTH) administration (1.98 IU/kg metabolic BW0.75) on plasma ACTH concentration (pg/dL) in beef heifers differing in phenotypic RFI. The values are expressed as Lsmeans with SEM. RFI, P = 0.59; Time, P < 0.001; RFI × Time interaction, P = 0.13. SEM: High RFI = 4.98; Low RFI = 6.55