Table 2.
Effects of environmental temperature on physiological and biochemical indexes of tissues and plasma in broilers (mean ± SEM, n = 12 per treatment).
| Items | Environmental temperature |
SEM | |||
|---|---|---|---|---|---|
| 20°C | 25°C | 28°C | 30°C | ||
| Plasma | |||||
| Cort (μg/L) | 101.00c | 107.00c | 131.00b | 154.00a | 3.994 |
| ACTH (ng/L) | 39.00b | 44.50a,b | 46.70a,b | 49.50a | 1.813 |
| CK (U/mL) | 1.57c | 1.62b,c | 1.80a,b | 1.85a | 0.030 |
| LDH (U/L) | 463.00b | 474.00a,b | 482.00a,b | 531.00a | 11.440 |
| IGF-І (μg/L) | 16.80a | 15.40a,b | 14.20b | 13.60b | 0.395 |
| Liver | |||||
| HSP70 (ng/gprot) | 248.00c | 267.00b,c | 304.00a,b | 334.00a | 8.482 |
| Breast muscle | |||||
| HSP70 (ng/gprot) | 211.00b | 226.00a,b | 244.00a,b | 266.00a | 6.478 |
a–cMean values within a row with no common superscript differ significantly (P < 0.05).
Abbreviations: ACTH, adrenocorticotropic hormone; CK, creatine jubase; Cort, Cortisol; HSP, heat shock protein; IGF-І, insulin-like growth factor-І; LDH, lactate dehydrogenase; SEM, standard error of mean.