- Sep 13, 2018
- Reaction score
- Karragullen, Western Australia
Here we just have grade one and grade two embryos. Grade one can be frozen but grade two go straight into donors at time of flushing. I find the stage grading quite interesting, might need to look into that more. When i was involved with flushing a cow we had over 20 structures but ended up with 6 frozen and 3 grade 2 that went straight into donors.Simme, I agree. However, after flushing embryos they should be examined under a microscope to determine the stage. The stages are 1 - 9, but viable embryos are stage 4, 5, 6 or 7. The stage is determined by how much the embryo has grown and not necessarily how many days it was before the donor cow was flushed. It is important to know the stage of your embryos so they are implanted the correct number of days after standing heat.