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. 2019 Apr 23;97(7):2989–3006. doi: 10.1093/jas/skz135

Table 5.

Effects of dietary soy isoflavones level and porcine reproductive and respiratory virus (PRRSV) infection on growth performance of weanling pigs

Item Uninfected PRRSV-infected SEM P-value
Uninfected vs. Infected Control Main effects2 Interaction
Control1 Control1 Control + ISF1 ETSBM1 ETSBM + ISF1 Soy source ISF Soy source × ISF
BW, kg
 initial 5.72 5.74 5.57 5.73 5.70 0.43 0.872 0.887 0.814 0.992
 final 12.12 8.65* 7.89 9.28 8.91 0.45 <0.001 0.057 0.196 0.151
−7 to 0 DPI3
 ADG, g/d 161 127 160 155 173 20.9 0.287 0.321 0.214 0.727
 ADFI, g/d4 677 632* 654 604 649 21.6 0.042 0.453 0.137 0.621
 G:F, g/kg4 264 214 240 259 275 35.1 0.300 0.272 0.559 0.878
0 to 6 DPI
 ADG, g/d 275 103* 83.2 126 107 35.2 0.001 0.362 0.441 0.965
 ADFI, g/d4 1,236 1,381 1,188 1,128 1,403 257.0 0.295 0.885 0.756 0.084
 G:F, g/kg4 248 75.5* 99.2 120 93.6 37.1 <0.001 0.551 0.977 0.443
6 to 14 DPI
 ADG, g/d 460 190* 156 270 219 46.7 0.0002 0.099 0.317 0.838
 ADFI, g/d4 728 489* 423 549 450 149.8 0.080 0.633 0.442 0.845
 G:F, g/kg4 526 437 268 484 173 99.5 0.384 0.803 0.020 0.463
0 to 14 DPI3
 ADG, g/d 380 137* 103 219 165 39.5 <0.001 0.015 0.125 0.712
 ADFI, g/d4 775 648 558 629 601 186.6 0.229 0.888 0.485 0.708
 G:F, g/kg4 566 250* 171 378 361 59.8 0.001 0.009 0.413 0.598

*Difference (P ≤ 0.05) between uninfected and infected groups fed the control diet.

Values represent least square means of 6 to 12 pigs. All pigs received allotted treatment diet starting −7 DPI. DPI = days postinoculation; ISF = isoflavones.

1The following diet names have been assigned to a respective experimental diet groups: Control: soy protein concentrate + no supplemented ISF, fed to both uninfected and PRRSV-infected control pigs; Control + ISF: soy protein concentrate + supplemented ISF, fed to PRRSV-infected pigs only; ETSBM: ETSBM + no supplemented ISF, fed to PRRSV-infected pigs only; ETSBM + ISF: ETSBM + supplemented ISF, fed to PRRSV-infected pigs only.

2Main effect of day post-inoculation (DPI); no 2- or 3-way interactive effects involving DPI were significant, so they were not included in the statistical model.

3Feed intake data and G:F values for −7 to 0 DPI from the first cohort of pigs (n = 28) were omitted due to a mechanical error with the feeders that led to incorrect feed intake measurements.

4ADFI was omitted if there was a net weight loss over measured period; G:F data were omitted if calculated value was less than 0 g/kg or greater than 1,000 g/kg.