Evaluation and classification of bovine embryos

Bó, G AMapletoft, R J

Bovine Embryo transfer has been used widely to reproduce the most valuable females in the herd with about 750,000 embryos produced annually from superovulated donors and more than 450,000 embryos produced are the safest and most cost affective alternatives to move genetics internationally because og their low risk of transmitting diseases. One of most important factors associated with the success and widepread application of this technologie is evaluation of the embryos before freezing and/or transfer to a recipient. Embryos are usually classified based on a number code system for their stage of development (1 to 9) and for their quality (1 to 4). The basic principles of embryo evaluation are briefly described.(AU)

1. embryo
2. transferable
3. IETS
4. nlele
5. classification