I am looking at adding in some scratch to throw out in the run every day to keep the girls busy. From what I read on here, I only want to throw out a little bit, about what they can eat in 20 mins or so. I also read to be careful how much you feed in the summer b/c they don't need as many calories. I'm planning on using this as a supplement to their regular diet just to give them something to do. Are there any brands of scratch that are recommended more than others? I have already been throwing out strawberry tops and some leftovers at random too, but it sounds like they have more fun with scratch.