Table 8.
Thyroid hormones of broilers after dietary minerals (Zn-Cr and Se) supplementation under heat stress conditions. (n = 8).
| Treatments | Triiodothyronine (T3), ng/mL) | Thyroxine (T4), ng/mL |
|---|---|---|
| (A) Effect of Zn-Cr mixture | ||
| Without Zn-Cr | 2.01 b | 8.45 |
| With Zn-Cr | 2.20 a | 8.88 |
| SEM | 0.03 | 0.15 |
| p-value | 0.0012 | 0.0544 |
| (B) Effect of organic Se levels | ||
| Without Se | 2.02 b | 8.35 |
| With LSe ≠ | 2.18 a | 8.77 |
| With HSe ≠≠ | 2.11 ab | 8.88 |
| SEM | 0.07 | 0.18 |
| p-value | 0.0390 | 0.1160 |
| (A × B) Effect of interaction between Zn-Cr mixture and organic Se levels | ||
| T1 | 1.97 b | 8.29 |
| T2 | 2.07 b | 8.41 |
| T3 | 1.98 b | 8.55 |
| T4 | 2.09 b | 8.52 |
| T5 | 2.39 a | 9.00 |
| T6 | 2.14 b | 9.24 |
| SEM | 0.06 | 0.25 |
| p-value | 0.0011 | 0.1122 |
a,b = means with different letters in the same column are significantly different at (p < 0.05). SEM, standard error of the mean. ≠ LSe = low selenium concentration, ≠≠ HSe = high selenium concentration. T1 = (basal diet, no additive), T2 = T1 + 100 mg Zn + 1.5 mg Cr/Kg diet (Zn-Cr), T3 = T1 + 0.6 mg Se/Kg, T4 = T1 + 0.9 mg Se/Kg, T5 = T1 + (100 mg Zn + 1.5 mg Cr + 0.6 mg Se) and T6 = T1 + (100 mg Zn + 1.5 mgCr + 0.9 mg Se).