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Table 3 Effect of exogenous adrenocorticotropic (ACTH) administrationa on haematology variables in beef heifers differing in phenotypic residual feed intake (RFI)

From: Stress and immunological response of heifers divergently ranked for residual feed intake following an adrenocorticotropic hormone challenge

   Time (min) relative to ACTH administration     
Cell typeb RFI Group 0 20 80 150 270 330 390 SEM RFI Time RFI × Time
Neutrophils, × 103 cells/μL High 9.1 11.7 10.9 11.4 11.9 11.9 12.2 0.36 0.90 0.001 0.92
Low 8.5 11.3 10.8 12.2 12.9 11.9 11.7 0.41    
Lymphocytes, × 103 cells/μL High 3.36 3.51 3.3 2.92 3.21 3.41 4.02 0.159 0.99 0.71 0.78
Low 3.88 3.38 3.16 3.07 3.55 3.32 3.27 0.175    
Monocytes, × 103 cells/μL High 0.69 0.39 0.53 0.39 0.45 0.47 0.58 0.04 0.99 0.01 0.95
Low 0.7 0.5 0.68 0.39 0.49 0.38 0.42 0.045    
Eosinophils, × 103 cells/μL High 0.18 0.08 0.21 0.12 0.12 0.12 0.36 0.027 0.85 0.001 0.06
Low 0.19 0.21 0.06 0.13 0.19 0.31 0.24 0.031    
Basophils, × 103 cells/μL High 0.05 0.06 0.05 0.06 0.06 0.06 0.07 0.003 0.61 0.001 0.3
Low 0.05 0.05 0.05 0.06 0.07 0.06 0.06 0.003    
WBC, × 103 cells/μL High 16.6 14.7 15.3 14 14.8 14.7 16.3 0.3 0.35 0.53 0.7
Low 15.4 16.2 16.1 15.3 16.6 15.4 15.3 0.34    
RBC, × 106 cells/μL High 6.19 6.33 6.04 5.66 6.08 6.03 6.17 0.093 0.02 0.1 0.81
Low 5.89 6.66 6.42 6.41 6.53 6.43 6.57 0.107    
HGB, g/dL High 9.46 9.6 9.14 8.63 9.25 9.25 9.54 0.124 0.08 0.04 0.8
Low 8.77 9.94 9.6 9.51 9.78 9.62 9.81 0.142    
HCT, % High 23.6 24.3 23.1 21.8 23.3 22.9 23.6 0.36 0.02 0.06 0.87
Low 22.4 24.5 24.5 24.4 24.8 24.5 25.1 0.42    
MCHC, g/dL High 40.3 39.5 40 44.8 40.2 40.7 40.9 0.63 0.23 0.71 0.92
Low 44.3 38.7 38.7 38.8 39.2 39.1 38.8 0.74    
PLT, × 103 cells/μL High 366.6 312.7 458.9 327 420.5 300.7 346.4 22.82 0.69 0.001 0.76
Low 309.3 329.4 405.2 269.1 436.3 274.4 310.4 26.11    
  1. aExogenous ACTH (1.98 IU/kg metabolic BW075)
  2. b WBCP White blood cell number, RBC red blood cell number, HGB hemoglobin concentration, HCTH hematocrit percentage, MCHC mean corpuscular hemoglobin concentration, PLT platelet number