Digital thermometers were used in each
cabinet to verify set point temperatures. Initially all eggs were distributed randomly into one experimental
incubator and were incubated for 17 d under uniform conditions (dry bulb temperature 37.6 ± 0.5 °C and
58% RH). The experimental setter was monitored twice daily to ensure proper operation. After day 17 (408
h), the eggs were transferred at random to four hatchers which operated at different temperatures