I'd suggest a 20% feed like flock raiser to bring them to maximum healthy weight.
At that age RSL are probably not laying much anymore. RSL are a production egg breed and are not genetically designed to grow heavy thighs and breasts. They will never fill out like a quality dual purpose or meat bird.
At that age RSL are probably not laying much anymore. RSL are a production egg breed and are not genetically designed to grow heavy thighs and breasts. They will never fill out like a quality dual purpose or meat bird.