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Investigation of cryoprotectant toxicity to porcine embryos


, : Investigation of cryoprotectant toxicity to porcine embryos. Theriogenology 41(6): 1291-1298

The objective of this study was to examine the potential toxicity of sucrose (Experiment 1) and of various cryoprotectants (Experiment 2) to porcine preimplantation embryos. In Experiment 1, 65 embryos, ranging from compact morulae to hatched blastocysts, were allocated within donor female across 5 concentrations of sucrose (0, 0.25, 0.50, 1.0, 2.0 M) to determine the highest concentration that would not inhibit subsequent embryo development. After a 48-h post-treatment culture period, the embryos were stained and cell nuclei were counted. The concentration of sucrose affected embryo development (P lt 0.001) and embryo quality (P lt 0.001). Embryos placed into 2.0 M sucrose exhibited poorer development and quality than embryos at the lower 4 concentrations, which were not different from one another. In Experiment 2, 182 embryos of the same developmental stages as in Experiment 1 were collected from 16 donors. Embryos were allotted within donor female to 2 of the 5 concentrations (10, 20, 30, 40, or 50%) of each of 3 cryoprotectants (ethylene glycol, propylene glycol, glycerol). After a 30-sec exposure to a cryoprotectant, the embryos were cultured and stained as in Experiment 1. As the concentration of an individual cryoprotectant increased beyond 30%, embryo development decreased. Embryos exposed to glycerol or propylene glycol exhibited poorer development than did embryos placed into ethylene glycol, especially at concentrations of 40% or higher.

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Accession: 002416784

PMID: 16727483

DOI: 10.1016/0093-691x(94)90487-4

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