I feed once a day, if there is feed left over, I feed a little less the next day. If it is completely gone, I feed a little more. Thing is, it is rather amazing how this fluctuates. Weather can influence it, but not the way you think. Often times in cold weather even behind a wind break, they will eat less … unless it stays cold for several days, then they go back to normal. Same thing in extreme heat. They don’t like change but get used to it.
When I first started I kept way too much feed out. It was tread into the dirt, they would not eat it, and it began to smell.