I've been so busy with garden, chickens and installing a security system to hopefully deter curious bears (!!) that I haven't been on for a while.
I got an order of mixed heavies roosters for meat from Mc Murray which included White Wyandottes, Black Australorps, Buff Rocks, Speckled Sussex, Dark Cornish, New Hampshire and Rhode Island Reds and Light Brahmas.
I will keep one or two for my laying flock of 21 pullets(Aracanas, B. Australorps, Lt. Brahmas, Dark Cornish, Buff Rocks, Red Stars, Silver Laced Wyandottes, Rhode Isl and I'm pretty sure one -sexing error?- N. Hampshire Red) but the rest will be for meat. They are 11 wks old.
The turkey starter doesn't have any additives (I presume you mean such as medication or antibiotics?) but is higher in protien. I switched to it with no apparent ill effects and the roosters do appear to be gaining weight faster now (some are already crowing). Not really an objective observation since I'm not weighing them, but I do pick them up and feel for "meatiness" and they did suddenly start feeling more substantial after the switch.
When should I switch my hens to layer feed? They are housed and fed separately from the roosters.