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Cryopreservation of In Vitro-Produced Early-Stage Porcine Embryos in a Closed System. | LitMetric

Cryopreservation of In Vitro-Produced Early-Stage Porcine Embryos in a Closed System.

Biores Open Access

Division of Animal Sciences, Animal Sciences Research Center, University of Missouri, Columbia, Missouri. ; National Swine Resource and Research Center, University of Missouri, Columbia, Missouri.

Published: August 2015

AI Article Synopsis

Article Abstract

Cryostorage of porcine embryos in a closed pathogen-free system is essential for the maintenance and safeguard of swine models. Previously, we reported a protocol for the successful cryopreservation of porcine embryos at the blastocyst stage in 0.25 mL ministraws. In this experiment, we aimed at developing a protocol to apply the same concept for the cryopreservation of early-stage porcine embryos. Porcine embryos from day 2 through day 4 were delipidated by using a modified two-step centrifugation method and were then cryopreserved in sealed 0.25 mL straws by using a slow cooling method. Control groups included open pulled straw (OPS) vitrified embryos after delipidation and noncryopreserved embryos without delipidation. There were no significant differences in cryosurvival between embryos frozen in 0.25 mL straws and OPS vitrified embryos across all the stages (two cell to morula) examined (p>0.05). Similarly, in all groups examined, the blastocyst rates were not different between the two cryopreserved groups. However, the blastocyst rates from the cryopreserved groups were significantly lower than the noncryopreserved controls (p<0.05). This experiment demonstrated that early-stage porcine embryos can survive cryopreservation in a closed system by using a slow cooling method at a comparable rate to those vitrified by using an ultrarapid cooling method (p>0.05). However, the developmental competence was significantly reduced after cryopreservation compared to noncryopreserved embryos. Further research is needed to optimize the protocol to improve the developmental potential of cryopreserved early-stage porcine embryos in sealed straws.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4497712PMC
http://dx.doi.org/10.1089/biores.2015.0012DOI Listing

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