BACKGROUND: In order to thaw slow-cooled bovine embryos it is standard practice to draw out permeating cryoprotectants by passing embryos through successively decreasing osmotic solutions. However, recently it has been suggested that sucrose may not be needed in the warming media.
OBJECTIVE: The aim of this experiment was to compare the effect of warming media prepared with or without the inclusion of sucrose on the survival and hatching capacity of vitrified in vitro-derived bovine embryos. MATERIALS AND METHODS: Expanded blastocysts were produced in vitro and vitrified. Vitrified embryos were warmed either successively through 0.5, 0.3 and 0.2 M sucrose solutions ('stepwise'), or by placing directly into the blastocyst solution without the addition of sucrose ('direct'). A total of 93 expanded blastocysts were assigned randomly
to two treatment groups, respectively. RESULTS: The re-expansion rates of vitrified embryos warmed after 24h in vitro culture were similar between the two groups (46/46, 100%; 46/47, 97.9%). From those vitrified embryos that expanded at 24 h there was also no significant difference
in hatching rates after 48 h in vitro culture (42/46, 91.3%; 40/46, 87.0%). CONCLUSION: The findings indicate that stepwise warming through sucrose solutions is not required for continued embryo development. Hence, a more time-efficient warming method for vitrified embryos may
be followed when conducting cattle embryo transfers.
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IN VITRO-DERIVED EMBRYO;
Document Type: Research Article
September 1, 2017
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CryoLetters is a bimonthly international journal for low temperature sciences, including cryobiology, cryopreservation or vitrification of cells and tissues, chemical and physical aspects of freezing and drying, and studies involving ecology of cold environments, and cold adaptation
The journal publishes original research reports, authoritative reviews, technical developments and commissioned book reviews of studies of the effects produced by low temperatures on a wide variety of scientific and technical processes, or those involving low temperature techniques in the investigation of physical, chemical, biological and ecological problems.