At 5 weeks that is definitely a male.Sadly, if the brown chick is a Roo, I will have to cull him because I currently have no openings to add more roosters. If you end up culling a bird to eat, how big or what age do you let them get before culling?
I usually slaughter at 14-16 weeks, just as they really start to cause 'trouble'.
But you can do it at any age.