| ASA (A), ppm | | Vit E (E), IU | |
P-value |
---|
| 0 | 125 | SEM | 50 | 100 | 200 | SEM | A | E | A × E |
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D 0 – 14 |
ADG, g/d | 154 | 173 | 5.4 | 175 | 163 | 152 | 5.4 | 0.034 | 0.119 | 0.375 |
ADFI, g/d | 180 | 182 | 5.2 | 190 | 181 | 171 | 5.2 | 0.998 | 0.090 | 0.503 |
G:F | 0.87 | 0.94 | 0.022 | 0.93 | 0.90 | 0.88 | 0.022 | 0.087 | 0.587 | 0.175 |
D 0 – 21 |
ADG, g/d | 234 | 245 | 5.6 | 250 | 240 | 230 | 5.6 | 0.218 | 0.183 | 0.614 |
ADFI, g/d | 279 | 288 | 6.4 | 290 | 280 | 280 | 6.4 | 0.469 | 0.678 | 0.867 |
G:F | 0.86 | 0.87 | 0.013 | 0.87 | 0.86 | 0.86 | 0.013 | 0.742 | 0.894 | 0.412 |
Diarrhoea index, %b
| 8.2 | 6.0 | 0.78 | 7.1 | 6.4 | 7.8 | 0.79 | 0.126 | 0.701 | 0.043 |
Antibioticc
| 1.8 | 1.7 | 0.16 | 1.8 | 1.8 | 1.7 | 0.17 | 0.724 | 0.910 | 0.023 |
E. coli scored
| 8.0 | 6.3 | 0.79 | 7.4 | 5.8 | 8.2 | 0.79 | 0.009 | 0.002 | 0.391 |
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aAll pigs were experimentally infected with an enterotoxigenic strain of E. coli on 7, 8 and 9 d after weaning. The numbers of replications were 32 individual pigs up to d 10 and 24 pigs from d 14 to 21
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bDiarrhea index, %; mean percentage of days with diarrhea with respect to first 14 d after weaning. Significant interaction (P < 0.05) occurred between ASA and Vit E for the diarrhoea index, such that supplementation of 200 IU Vit E/kg diet decreased diarrhoea index but only with concurrent supplementation of 125 ppm ASA
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cMean number of antibiotic treatments. Significant interaction (P < 0.05) occurred between ASA and Vit E for the number of antibiotic treatments, such that supplementation of 200 IU Vit E/kg diet decreased the number of antibiotic treatments but only with concurrent supplementation of 125 ppm ASA
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dMean cumulative E. coli scores per diet in the 14 d after weaning