I have seen varying sizes of chick starter feed bags. Obviously the larger the bag, the less costly per pound. Approx how much will I need per chick before it is time to switch to the next feed? I don't want to buy more than i'll need, only to still have it leftover when I move on to the developer feed. I have read about 1/10 pound per chick per day. That means I would need a little less than 40 lbs for 8 chicks for thier first month? Does that sound about right?