THE ANSWER IS IN YOUR HEART 

It depends on the type of beliefs that you have, if you are more cicienciologic and nonbeliever, the science is real.

We understand that after the bigbang were the atoms of the chemical elements that are capable of generating CHOMP life and this in turn began to mix and from there began to create cells of all kinds.

We understand that the egg is the largest cell that exists in the world.

Then for this case the answer would be that the egg, in the case that the animal that has been evolved through time in a hen, was before a cell created after the big bang.

 
On the other side of religion: If you are greyente and you think that there is a god all powerful that I believe to the man the animles, ales and the earth in only 7 days. We would say it was the chicken first god created the animal first. I hope I have helped you with this doubt. 

If you believe in God, you will be punished for asking these kinds of questions.

I HOPE YOU FEEL THE FURY OF GOD, for questioning his work. ;p 

I dont believe in God