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In swine, five to six days post-insemination, morulae and blastocysts are collected together after uterine flushing. The purpose of this study was to vitrify zona pellucida-intact morulae with Open Pulled Straw (OPS) technology and obtain piglets after transfer. Morulae (200) were vitrified after a two-step equilibration in ethylene glycol, dimethyl sulfoxide and sucrose in Hepes-buffered TCM199 + 20% NBCS medium (TCM). 2-6 morulae were loaded into OPS and plunged into liquid nitrogen. At embryo warming, a three-step dilution with decreasing concentrations of sucrose was applied. In each of 10 recipients, 20 morulae were transferred surgically. Day 25, gestation rate and the farrowing rate were 80% and 70%, respectively. The pregnant recipients farrowed from 1 to 8 piglets and the survival of total transferred embryos was 13%. Although survival rates are still compromised, OPS technology is therefore appropriate to cryopreserve porcine morulae with intact zona pellucida.

Birth of piglets after OPS vitrification and transfer of compacted morula stage embryos with intact zona pellucida