Feed as much as the little piggy wants to eat right now. She is a growing machine. Truly from my experiences so far. They all grow/mature at different rates so it is hard to say at 6 months or even at 9 months to slow down. If i was growing her out. I would keep an eye on her physical appearance and adjust my feeding from that. You want a nice healthy female, im not a fan of keeping them slim and trim. When they produce eggs it take a bit from them and if they lay a few times in succession. This can take a toll on a female that is not well fed. Im not saying to keep her fat. Im saying keep her looking healthy. Once she is of an adult size and she is looking at a good weight to you. Do weekly or even month weighing's. Log your feedings and weights to fine tune your kids regimen..