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Cryopreservation of Preimplantation Embryos of Cattle, Sheep, and Goats
Published on: August 5, 2011
Evaluation of cryopreservation techniques for bovine embryos
R S Prather1, M F Spire, R R Schalles
1Department of Surgery and Medicine Kansas State University Manhattan, KS 66506 USA.
Theriogenology
|August 1, 1987
Summary
Initial embryo quality is crucial for successful cryopreservation in cattle. Higher quality embryos (Grades 1 and 2) demonstrate better survival rates after freeze-thawing, highlighting the importance of pre-selection for effective embryo preservation.
Area of Science:
- Animal reproductive technologies
- Cryobiology
- Embryology
Background:
- Efficient cryopreservation of bovine embryos is vital for livestock breeding programs.
- Optimizing freeze-thaw protocols is essential to maximize embryo survival rates.
- Dimethyl sulfoxide (DMSO) and glycerol are common cryoprotectants, but their efficacy can vary with procedural steps.
Purpose of the Study:
- To evaluate the impact of different dehydration procedures, cryoprotectants, and rehydration methods on bovine embryo survival.
- To determine the influence of initial embryo quality on post-thaw viability.
- To assess the effectiveness of various steps in the freeze-thaw process on embryo morphology.
Main Methods:
- A total of 228 bovine embryos were nonsurgically collected and subjected to dehydration using dimethyl sulfoxide (DMSO) or glycerol via a three-step or timed interval titration (T.I.T.) procedure.
- Embryos were frozen using a controlled cooling rate to -38°C, followed by plunging into liquid nitrogen (-195°C).
- Thawing occurred in a 27°C or 37°C water bath, with subsequent rehydration using six-step, three-step (sucrose), or one-step (sucrose) procedures.
Main Results:
- Initial embryo quality was the most significant factor affecting survival, with Grades 1 and 2 embryos showing higher survival rates than Grade 3 embryos (P < 0.05).
- Dimethyl sulfoxide (DMSO) as a cryoprotectant yielded better outcomes during the post-dehydration to post-thawing interval (P = 0.02).
- Embryo quality grade significantly influenced subsequent quality throughout the freeze-thaw and rehydration process (P < 0.01), with progressive morphological degradation observed at each step.
Conclusions:
- The initial quality of bovine embryos is a critical determinant of success in cryopreservation protocols.
- While DMSO showed an advantage in specific intervals, the overall integrity of embryos declines throughout the freeze-thaw and rehydration process.
- Further refinement of cryopreservation techniques is needed to mitigate morphological damage and improve post-thaw viability in cattle embryos.
