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. 2008 Nov;86(11):3023–3032. doi: 10.2527/jas.2007-0859

Table 2.

Effects of feeding an avian-derived polyclonal antibody preparation against Streptococcus bovis (PAP-Sb) or Fusobacterium necrophorum (PAP-Fn) on steer performance and carcass characteristics in 2 consecutive years (data pooled; Exp. 1)

Main effect1
PAP-Fn PAP-Sb
Item 0 mL/d 2.5 mL/d 0 mL/d 2.5 mL/d SEM PAP-Fn × PAP-Sb P-value
Initial BW, kg 265 267 266 266 6.6 0.43
Final BW, kg 542 544 543 544 6.5 0.19
Carcass-adjusted final BW, kg 542 539 540 541 7.5 0.26
ADG, kg 1.72 1.73 1.72 1.73 0.10 0.17
Carcass-adjusted ADG, kg 1.71 1.70 1.70 1.71 0.11 0.23
DMI, kg/d 9.35 9.37 9.39 9.33 0.29 0.70
G:F 0.183 0.184 0.182 0.185 0.009 0.05
Carcass-adjusted G:F 0.183 0.181 0.181 0.183 0.009 0.13
HCW, kg 339 338 338 339 9.6 0.26
Dressing percentage2 62.7 62.2 62.5 62.4 0.13 0.58
Fat thickness, cm 1.44 1.46 1.43 1.48 0.04 0.14
LM area, cm2 78.96 79.55 78.90 79.61 0.85 0.55
KPH, % 2.16 2.16 2.15 2.17 0.26 0.49
Yield grade 2.98 3.01 2.97 3.02 0.52 0.26
Marbling score3 519 519 514 523 6.0 0.80
USDA quality grade,4 %
    Choice or greater 61.7 61.2 61.4 61.5 — 0.79
    Select 37.2 37.7 37.0 37.9 — 0.56
    Standard 1.1 1.1 1.6 0.6 — 0.32
Abscessed livers, % 18.3 9.7 16.9 11.1 — 0.46
Liver abscess score5 0.267 0.111 0.240 0.124 0.068 0.11
1

For PAP-Fn, 0 mL/d was represented by the mean of the control (no PAP fed) and the PAP-Sb treatment. For PAP-Sb, 0 mL/d was represented by the mean of the control (no PAP fed) and the PAP-Fn treatment.

2

Main effect of PAP-Fn observed (P = 0.01).

3

300 = Slight 00; 400 = Small 00; 500 = Modest 00.

4

Quality grade category determined by USDA grader.

5

Main effect of PAP-Fn observed (P = 0.04). Liver abscess score: 0 (no abscesses present) = 0; -A (1 or 2 minor abscesses) = 1; A (2 to 4 well-established abscesses) = 2; and +A (large, active abscesses, may contain inflammation on the abscess periphery) = 3.