I have 20 ten weeks old chickens. They go through 13lbs of starter feed in 2-3 days. PLus they get alot of table scraps and free range every night for 1-2 hours. My question is...Should I let them eat so much of the starter feed, should I only have it out for them for a few hours and take it out and feed them again the next day or do I keep it available at all times?