Well, not all of it actually. Majority of the eggs will be the same species as the mother. Two of my first egg batch were actually Shinx, the father's species instead of Mareep. You can't really time when the eggs will come though.

Plus, the eggs don't receive all the moves their parents have since not all pokemon can learn the same moves. I've been reading up on breeding lately. Sometimes to get the right move, you might have to chain breed to get the move to a pokemon that's compatible to breed. It gets complicated very quickly.