Table 3.
Average daily gain (ADG) and antibody titers [sample to positive (S/P) ratio] to Mycoplasma hyopneumoniae vaccination in pigs categorized at weaning based on hemoglobin (Hb) levels: anemia (Hb < 90 g/L), iron deficient (Hb from 90 to 110 g/L), and normal (Hb > 110 g/L).
| Trial 1a | Anemic (n = 23) | Iron deficient (n = 16) | Normal (n = 31) |
|---|---|---|---|
| Weight at weaning (kg) | 7.8 ± 0.2a | 7.6 ± 0.2a | 6.3 ± 0.2b |
| Weight 42 d post-weaning (kg) | 27.5 ± 0.6 | 28.0 ± 0.8 | 25.4 ± 0.7 |
| ADG for 42 d in nursery (kg/d) | 0.56 ± 0.01 | 0.58 ± 0.01 | 0.55 ± 0.01 |
| S/P ratio for M. hyopneumoniae at 42 d post-weaning | 0.45 ± 0.04 | 0.37 ± 0.04 | 0.43 ± 0.05 |
|
| |||
| Trial 2a | Anemic (n = 10) | Iron deficient (n = 20) | Normal (n = 45) |
|
| |||
| Weight at weaning (kg) | 7.2 ± 0.3a | 6.2 ± 0.3b | 6.2 ± 0.2b |
| Weight 42 d post-weaning (kg) | 26.0 ± 1.1 | 25.6 ± 1.0 | 25.1 ± 0.5 |
| ADG for 42 d in nursery (kg/d) | 0.45 ± 0.02 | 0.46 ± 0.02 | 0.45 ± 0.01 |
| S/P ratio for M. hyopneumoniae at 42 d post-weaning | 1.18 ± 0.17 | 0.99 ± 0.11 | 0.88 ± 0.06 |
|
| |||
| Trial 3a | Anemic (n = 80) | Iron deficient (n = 63) | Normal (n = 71) |
|
| |||
| Weight at weaning (kg) | 6.2 ± 0.1a | 6.4 ± 0.2a | 5.6 ± 0.2b |
| Weight at 35 d post-weaning (kg) | 22.1 ± 0.4 | 22.7 ± 0.5 | 21.3 ± 0.6 |
| ADG for 35 d in nursery (kg/d) | 0.46 ± 0.01 | 0.46 ± 0.11 | 0.45 ± 0.01 |
| S/P ratio for M. hyopneumoniae at 35 d post-weaning | 0.36 ± 0.03 | 0.37 ± 0.04 | 0.38 ± 0.04 |
a
Values are expressed as mean ± standard error of the mean.
Different superscripts denote statistical difference (P < 0.05).