Each group was subdivided into a control group and a HS group. In the control group, maturation, fertilization
and development were performed at a constant temperature of 39 °C. In the HS group, 96 hpi, embryos
were subjected to HS of 41 °C for 12 consecutive h, and then returned to a temperature of 39 °C. Rates of
cleavage, and formation of morula, blastocysts, and hatched blastocysts were determined at 48, 96, 168, and
240 hpi, respectively