The first year I raised BSF I feed en as i raised them. I realized by the end of the summer that was silly since they get plenty of bugs on their own all summer. So the last 2 years I've frozen them all summer so I can feed them over the winter. But be prepared - the chickens LOVE em. Lol
Caution - do not feed BSF to chicks- way too high in calcium.
Guineas. .. We got then years ago for tick control and frankly I dislike them. But they did solve the tick problem. They really have no other benefit to me. They eat bugs that the chickens could have, their eggs are small (when you can find them), and they aren't tasty. After ours were feathered out we turned them loose and haven't fed them since. Not having to feed them is the only reason they are still here. There are a few select things they really seem to like in the main garden (cauliflower leaves and cabbage) but other than that they dorms most of their time in the woods surrounding the barn and then sleep in the barn rafters at night.