Cryopreservation of in vitro-produced (IVP) bovine embryos is a critical step to ensure the widespread reproduction and conservation of high-value animals. Vitrification appears to be the most efficient approach for IVP embryos, which are more sensitive to cryoinjury than their in vivo counterparts (Rizos et al., 2001). Vitrification, however, requires a stereomicroscope during the stepwise warming procedure and trained personnel to examine embryos before transfer, limiting its application on a large scale. VitTrans is a device