A lot of places I've been to put the feed out in multiple piles, and the horses have to walk around, but the microchip thing, I don't think is a good idea. Like people said, horses can and will figure it out, and then start running each other off the food, and stealing the other horse's grain. We made sure that the horses each had their own pile of hay, and then would put down their buckets of feed. I did have to run other horses off when I fed my mare though, as she was the bottom of the herd, and was always getting run off her grain, and was getting skinny. Same thing would happen with the micro chip idea. The horses that live in the most natural of settings are the ones that are on HUGE acreage, with grass, hay supplemented when necessary, and not fed anything else. But that's hard to find in a lot of places, so it's not really a "natural" way of doing things. I have a friend who lives in Germany, I'm going to ask him for more details, cause I'm interested to see where this is coming from.