Table 3.

Normal rate of α-tubulin (%).

Group	4 h	18 h	42 h
Control	75.56 ± 4.84	76.67 a ± 3.85	77.78 a ± 4.45
HS	73.33 ± 1.93	41.11 b ± 2.94	43.33 b ± 3.85
HSMT	72.22 ± 3.68	62.22 c ± 2.94	61.11 c ± 4.01

HS: heat stress; HSMT: heat stress + melatonin. Significant differences (p < 0.05) are indicated by different letters within the same column: ^a,b,c.