instead of feeding them layer crumbles, you might want to switch to something like a flock raiser crumble. The added calcium in layer feeds are beneficial to laying hens, but pullets and roosters, along with older nonlaying hens can’t process and eliminate the excess calcium from their systems. Flock raiser typically has a higher protein content then layer feeds, so they can buffen up and grow nice feathers.To answer a few questions, I'm sure it's a rooster, though technically it would be a cockerel, 6 months old. He was raised with my Barred Rock and RiR cockerels. I feed them a crumble layer mix along with a mix of black oil sunflower seeds, whole oats, and corn. I don't give them a lot of corn because i know it's not so great for them but we've had a few colder days (high 20s at night) and this was their winter so maybe he did just pick a bunch of corn out.