. 2013 May 10;59(4):378–384. doi: 10.1262/jrd.2013-015

Table 6. Survival and maturation of immature porcine oocytes after cryoprotectant treatment or vitrification using a combination of EG and PG as permeable cryoprotectants.

Treatment groups	Total no. of oocytes examined	No. of live oocytes	No. of oocytes matured to MII
Treatment groups	Total no. of oocytes examined	(% total)	(% live oocytes)
Control	245	236	166
Control	245	(96.3 ± 1.8)^a	(69.9 ± 2.9)
Toxicity control	245	238	170
Toxicity control	245	(97.3 ± 0.8)^a	(70.8 ± 3.8)
Vitrified	397	173	119
Vitrified	397	(42.6 ± 5.3)^b	(66.4 ± 4.4)

Five replicates were performed. Percentage data are presented as mean ± SEM values. Toxicity control was carried out by subjecting COCs to CPA treatment without cooling. ^a,bPercentages with different letters in the same column differ significantly (P<0.05). MII = metaphase II, EG = ethylene glycol, PG = propylene glycol, COCs = cumulus-oocyte complexes, CPA = cryoprotective agent.