View Full Table | Close Full ViewTable 1.

Effects of bovine viral diarrhea virus (BVDV) type 1b exposure and subsequent Mannheimia haemolytica (MH) challenge on steer performance

 
Experimental treatment1
Item CON EarlyCh LateCh SEM P-value
BW, kg
    Initial 270 275 283 17. 7 0.67
    d 0 282 294 290 16.5 0.77
    d 4 291 287 280 16.6 0.77
    d 17 305 299 309 12.2 0.84
ADG, kg
    d 0 to 4 2.21a −1.51b −2.62b 0.74 <0.001
    d 5 to 17 1.14a 0.88b 2.26c 0.31 0.01
    d 0 to 17 1.39a 0.32b 1.12a 0.27 0.03
DMI, kg/d
    d 0 to 4 6.58a 5.13b 5.80c 0.24 <0.001
    d 5 to 17 6.38 6.06 6.72 0.31 0.33
    d 0 to 17 6.42 5.84 6.36 0.22 0.15
DMI, % BW
    d 0 to 4 2.31a 1.81b 1.85b 0.13 0.02
    d 5 to 17 2.51 2.08 2.26 0.17 0.49
    d 0 to 17 2.19 2.02 2.16 0.14 0.39
G:F, kg/kg
    d 0 to 4 0.32a −0.31b −0.50b 0.14 0.001
    d 5 to 17 0.17a 0.12b 0.33c 0.05 0.01
    d 0 to 17 0.22a 0.04b 0.17c 0.05 0.03
a–cWithin a row, means with different superscripts are different (P < 0.05).
1CON = steers not exposed to calves PI with BVDV 1b and not challenged with MH; LateCh = steers intratracheally challenged with MH 84 h after being exposed to calves PI with BVDV 1b for 72 h; EarlyCh = steers intratracheally challenged with MH 12 h after being exposed to calves PI with BVDV 1b for 72 h.



View Full Table | Close Full ViewTable 2.

Effects of bovine viral diarrhea virus (BVDV) type 1b exposure and subsequent Mannheimia haemolytica (MH) challenge on steer hemogram

 
Treatments1
P-value
Item CON EarlyCh LateCh SEM Treatment Treatment × time
Monocytes/μL 344.2 378.6 355.6 46.5 0.77 0.87
Eosinophils/μL 238.5 304.9 207.2 48.8 0.30 0.73
Basophils/μL 124.1 102.4 100.1 10.3 0.20 0.02
Hematocrit, % 33.66 33.11 33.45 1.01 0.73 0.99
Hemoglobin, g/100 mL 12.26 11.89 12.07 0.29 0.45 0.79
Mean corpuscular volume, fL 37.71 37.28 38.6 0.79 0.22 0.84
Mean corpuscular hemoglobin, % 13.83 13.52 13.93 0.20 0.35 0.99
Platelets, 103/μL 649a 566b 478c 31.7 0.001 0.62
Red blood cells, 106/μL 8.80 8.83 8.43 0.22 0.08 0.01
a–cWithin a row, means with different superscripts are different (P < 0.05).
1CON = steers not exposed to calves PI with BVDV 1b and not challenged with MH; LateCh = steers intratracheally challenged with MH 84 h after being exposed to calves PI with BVDV 1b for 72 h; EarlyCh = steers intratracheally challenged with MH 12 h after being exposed to calves PI with BVDV 1b for 72 h.