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Open pulled straw vitrification and slow freezing of sheep IVF embryos using different cryoprotectants

journal contribution
posted on 06.12.2017, 00:00 by M Bhat, V Sharma, F Khan, N Naykoo, S Yaqoob, Gabor Vajta, H Khan, M Fazili, N Ganai, R Shah
The aim of the present study was to evaluate the post-thaw survival and hatching rates of sheep blastocysts using different cryoprotectants. In Experiment 1, Day 6 sheep embryos were cryopreserved by a slow freezing protocol using 10% ethylene glycol (EG), 10% dimethyl sulfoxide (DMSO) or a mixture of 5% EG and 5% DMSO. Hatching rates were higher in the 10% EG group than in the 10% DMSO or EG + DMSO groups (30% vs 18% and 20%, respectively). In Experiment 2, embryos were cryopreserved by open pulled straw (OPS) vitrification using either 33% EG, 33% DMSO or a mixture of 16.5% EG + 16.5% DMSO. Re-expansion and hatching rates in the EG + DMSO group (79.16% and 52.74%, respectively) were higher than those in the EG group (64.28% and 30.02%, respectively), whereas the outcomes for the DMSO group were the lowest (45.18% and 8.6%, respectively). In Experiment 3, embryos were cryopreserved by OPS vitrification using either 40% EG, 40% DMSO or a mixture of 20% EG + 20% DMSO. Re-expansion and hatching rates were highest in the EG group than in the EG + DMSO and DMSO groups (92.16% vs 76.30% and 55.84% re-expansion, respectively; and 65.78% vs 45.55% and 14.46% hatching, respectively). In conclusion, OPS vitrification was found to be more efficient for cryopreservation of in vitro-developed sheep embryos than traditional freezing.

History

Volume

27

Issue

8

Start Page

1175

End Page

1180

Number of Pages

6

ISSN

1031-3613

Location

Australia

Publisher

CSIRO Publishing

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Jāmiʻat al-Malik Saʻūd; School of Medical and Applied Sciences (2013- ); Sher-e-Kashmir University of Agricultural Sciences and Technology; TBA Research Institute; Vanasthallī Vidyāpīṭha;

Era Eligible

Yes

Journal

Reproduction, fertility and development.

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