Absolute chick weight at hatch (Table 1) was significantly reduced in the high-temperature group compared with the low-temperature and control groups in the first experiment (P = 0.0119) and compared with the control group in the second experiment (P = 0.0219). Moreover, the relative chick weight at hatch (Table 1) was significantly lower for the high-temperature group than for the other 2 groups in both experiments (P < 0.0001).