@article {10.3844/ajavsp.2022.101.107, article_type = {journal}, title = {Effect of two Different Permitting and Combination of Cryoprotectants on Cattle Oocytes Maturation Rate Following Brilliant Cresyl Blue Exposure}, author = {Mphaphathi, Masindi Lottus and O'Neill, Hester Adri and Nedambale, Tshimangadzo Lucky}, volume = {17}, number = {2}, year = {2022}, month = {May}, pages = {101-107}, doi = {10.3844/ajavsp.2022.101.107}, url = {https://thescipub.com/abstract/ajavsp.2022.101.107}, abstract = {The objectives of this study were to elucidate the toxicity of Dimethyl sulfoxide (DMSO), Ethylene glycol (EG), and the combination of both permitting cryoprotectants (CPAs) to cattle oocytes and the effectiveness of Brilliant cresyl blue (BCB) on immature oocytes pre-selection. Cattle ovaries were collected from the local slaughterhouse and transported within 2 hours of slaughter. The oocytes were exposed to 26 mM BCB solution. The other oocytes were not exposed to BCB solution or CPA. Oocytes were classified as BCB positive (+) or BCB negative (−). Oocytes were either exposed to DMSO, EG, or DMSO + EG at different CPA concentrations as follows: toxicity test 1 (TT1) was 0, 5, 10, 15, and 20%, followed by exposure to TT2 as follows: 10, 20, 30 and 40%. The oocytes were then in vitro matured as per treatment groups. After maturation, oocyte polar body extrusion was evaluated. Treatment means were compared using the Fisher-protected t-test least significant difference. The DMSO treatment group: The oocytes with polar body extrusion were 55.1% (positive control, no BCB and no CPA exposure), 55.0% (control, CPA exposure no BCB), 22.7% [BCB− with CPA toxicity test (DMSO 5 + 10%)], 21.8% [BCB− with CPA toxicity test (DMSO 10 + 20%)] and 7.3% [BCB− with CPA toxicity test (DMSO 20 + 40%)]. The BCB + groups (DMSO 5 + 10 and DMSO 10 + 20%) had more oocytes with polar body extrusion (67.0 and 66.9%, respectively; P>0.05). The EG treatment group: There was a drastic decline of oocytes with polar body extrusion as EG CPA concentration increased (P}, journal = {American Journal of Animal and Veterinary Sciences}, publisher = {Science Publications} }