Embryo transfer is when a baby animal, like a cow or a sheep, is created outside of its mother's body and then put into her womb to grow.
First, scientists take an egg from the mother animal and a sperm from the father animal. They put these together in a lab dish to create an embryo, which is like a tiny baby animal that hasn't grown much yet.
Then, they wait a little while to make sure the embryo is healthy and growing well. After that, they take the embryo out of the lab dish and put it into a tiny straw-like tool.
Next, they gently insert this tool into the mother animal's womb, and release the embryo so it can attach to the wall of the womb.
Once it's attached, the embryo can start growing into a baby animal! The mother animal will carry the baby until it's fully developed and ready to be born, just like she would if she had made the baby on her own.
This process can be very helpful for farmers or scientists who want to create babies with specific traits, like being strong or healthy, or for animals who can't have babies on their own. It's a lot of hard work, but it can help create healthy and happy baby animals!