We are having a problem with rats getting in the coop and eating our chickens' grain crumbles. Our chickens currently free-feed. So we would like to go just feeding once a day, and only what the hens will eat at one time so we aren't paying to feed the rats. They are not free range, but we do supplement often with veggie scraps in the warm months. We supplement with scratch in the winter months. We have our chickens seperated into two flocks: one flock is five hens born in spring of 2007. The other is a flock consisting of about 6 pullets, one cockerel, and two small laying hens (Polish). How much feed should I put out for each flock or per bird? Is it okay to just feed once in the morning and supplement with something in the afternoon? Any help would be appreciated. Thanks!