Table 4.
Selection-induced alterations in blood concentrations of dopamine, serotonin, and corticosterone in laying hens.
| Lines | Corticosterone (ng/mL) | Dopamine (ng/mL) | Epinephrin (ng/mL) | Serotonin (ng/mL) | H/L Ratio 2 (×100) |
|---|---|---|---|---|---|
| KGB 1 | 1.87 + 0.19 | 0.59 + 0.08 a | 0.30 + 0.06 a | 11.8 + 0.07 a | 13.0 a |
| MBB | 1.49 + 0.21 | 2.42 + 0.76 b | 0.59 + 0.13 b | 14.3 + 0.06 b | 29.4 b |
a,b Means within a column with different superscript are statistically different (n = 12, p < 0.05). 1 The KGB (kind gentle bird) and MBB (mean bad bird) lines were selected for high and low productivity and survivability resulting from cannibalism and flightiness, respectively. 2 Heterophil/lymphocyte ratio [90].