Table 6.
The effects of probiotic on catecholamines, 5-HT, and respective metabolites in the hypothalamus of 43-day-old broilers subjected to daily cycling heating episodes.
| Item | Control | Probiotic | SEM | P value |
|---|---|---|---|---|
| Catecholamine system | ||||
| DA (ng/g) | 301.77 | 295.84 | 6.76 | 0.37 |
| NE (ng/g) | 1673.75 | 1780.36 | 28.71 | 0.11 |
| EP (ng/g) | 273.22 | 322.92 | 7.39 | 0.83 |
| DOPAC (ng/g) | 88.25 | 97.36 | 1.31 | 0.10 |
| HVA (ng/g) | 235.71 | 268.94 | 4.27 | 0.07 |
| DOPAC/DA | 0.30 | 0.33 | 0.01 | 0.23 |
| HVA/DOPAC | 0.80 | 0.92 | 0.02 | 0.19 |
| 5-HT system | ||||
| TRP (ng/g) | 5041.90 | 5609.00 | 107.84 | 0.21 |
| 5-HT (ng/g) | 966.84 | 954.74 | 13.43 | 0.82 |
| 5-HIAA (ng/g) | 275.33 | 328.64 | 7.21 | 0.08 |
| 5-HIAA/5-HT | 0.28 | 0.35 | 0.01 | 0.07 |
Least square means were presented (n = 12).
Abbreviations: 5-HIAA, 5-hydroxyindoleacetic acid; 5-HT, 5-hydroxytryptamine; DA, dopamine; DOPAC, 3,4-dihydroxyphenylacetic acid; EP, epinephrine; HVA, homovanillic acid; NE, norepinephrine; TRP, tryptophan.