If you feed layer feed, then switching to a higher protein feed like a grower or a flock raiser will give them more protein, in the 18-20% protein range vs the 16% in layer. Just make sure you offer oyster shell in a separate feeder all the time, those that need the calcium will take what they need. I feed flock raiser to my flock all the time, I have roosters and older hens that no longer lay or only lay occasionally, they don't need the extra calcium in layer feed, and I think my flock does better with the slightly higher protein. I don't do extra for molting birds unless they are losing a lot of weight (molt can sometimes be hard on them), in those cases I will give them some cooked egg, or a bit of canned tuna to try to get them eating better, mixed in some of their crumbles mixed with water to make a mash. I make my birds a mash with their feed and water every morning, to them it's different and a 'treat' and I'm not watering down their nutrition or adding unneeded fat. They love it. I feed it in shallow puppy bowls or hog pans.