Quote Originally Posted by Sophist
Um, you still aren't getting it.

It isn't being absorbed through their skin. It is put into a needle, the needle then punches a hole in the eggshell injects the embryo.

This isn't a topical treatment, typically. It is an injection or series of injections done while they are still in the egg.
WTF OMG,

I thought you ment it was done after they hatched! sorry lol.

Thats even more crewl! no chick should be touched before or even at the begining of hatching.