Was hen born first or eggs?

Was hen born first or chicks? It may be very common question,and scientists remained in a puzzle for many years about solving this question. Now a new research revealed that there is a protein in egg shell which is found only in reproductive system of hens. From this it proves that hen was born first and then egg (the presence of protein in eggshell) proves it.
This is a very interesting topic and i want to know the opinion of all of you about this.and it wil be my honor to get benefit from you.
Thanks,
Dr. Syed