chicken yolk sizes

[mo chicken lady]

I'm new to this so I have a question.....what determines the size of the yolk in a chicken egg? I have several different breeds and they all Free range most of the day. The yolks in my eggs are the size of a golf ball and are very orange. Is this good?

 

[binza1979]

This is very good. It means your chickens are getting a great diet!