This freezing extender is only suitable to freeze stallion semen. It contains glycerol as cryoprotectant. You can centrifuge the sperm first with EVD or EVD + and then add the IVD. The IVD has a new formula now, and has improved the post-thaw motility and viability of the average stallion compared to the old formula. Sent out deeply frozen to customer. SEE SPERVITAL DELIVERY BOX.