ISA Browns are a Red Sex-LinkI think you were lied to about your breed.I think you have red sexlinks and you have all males.
Red secxlinks are a colored sex breed and the males are brown and white.Brown on the wings,yours look very similar.If they were isa brown they would be brown/red/white just like a red sexlink hen,if your hen was a red sexlink she would be white,red,and brown.
Not true. The males will be white and the females buff brown in all types of Red Sex-Links. These are ISA Browns from a project I did years ago.Yes but they are not colored sex as the males have the same coloring as the hen.
Female chick.
Here they are as youngsters. I kept 2 males for my project.