Table 1.

Motility and acrosomal integrity of cynomolgus macaque sperm cryopreserved with SC medium at different cooling rates

Distance to LN2 surface	Cooling rate (°C/min)	Sperm motility (%)	Acrosomal integrity (%)
1 cm	−435	9.7 ± 5.0b	86.0 ± 1.9b
4 cm	−183	25.0 ± 8.4c	88.2 ± 1.7b
7 cm	−69	18.2 ± 9.9c	86.8 ± 2.0b
Fresh sperm	—	84.2 ± 11.3a	91.7 ± 1.6a

All samples were held in LN₂ for 10 min. Different superscripted letters within a column indicate significant (P< 0.05) differences between values.