I have 23 cornish cross that are 5 weeks old. I'm feeding them from a 3 foot trough feeder I give them the trough at 430 am when I leave for work and noticed it's empty at 330 when I get home but not sure how many hours it's empty before I get home. I've been refilling the trough at 330 and giving it back to them and they act like they aint ate all day. They usually never empty the trough a second time and I take it back out at 430-500 pm. Am I over feeding them or is this about what they should be eating at this stage. They can walk run and fly surprisingly they're out in a large grassy fenced in area so they have access to fresh grass and bugs also. Should I cut back on the 18% feed or keep goin like I'm goin?