Cloe is one of the first cows on the farm. The B on her ear tag marks her as a breeding cow. In fact she's the reason why the protagonist happens to become a cowgirl himself. How exactly? I don't know yet. Maybe there's something in her milk that turns people into cowgirls.
Bessie. Thank the gods for Bessie. And her tits. She's the #1 producer of milk on the farm.
Bella is the friendly type of cowgirl. She welcomes the newcomers to the herd and helps them adjust to their new life.
Daisy and Maple are the latest cowgirls before our protagonist joins the herd. They haven't got used to their new lives yet, but as they will soon be in a milkable state, that will settle down.