Thanks for the reply. I'll give it a few more weeks and see what develops.
I'm calling them "Isabrown" as that is how they are described on the website of the company we purchased then from. (Hence, my city slicker reference - other than a pet cat, I know nothing much about animals, especially farm animals!).
The website describes them like this: "
The Isabrown is a cross breed between a Rhode Island Red and a white leghorn and is used around the western world for reliable egg production and for their excellent temperament with families. Their feathers are mainly red with splashes of white indispersed around the body and neck. "