The best guess I can give you is to say...it takes 2 pounds of feed to grow 1 pound of weight on the chicken from the time they're babies until they're 12 - 16 weeks old (After that it takes more feed for each pound they put on.) ....The stuff I read before I got my chicks said to fill feeders about 2/3 full if you use the long tray feeders, so they don't waste too much, since you should clean them out every day or so. I feed my chicks morning and evening, and when I find the feeders emptier than usual at unexpected times, I increase the amount I'm feeding them.
BTW -- a pint is about a pound, and a gallon is 8 pints, or 8 pounds. So for 34 chickens, you are giving them each about 1/4 pound, which would be a 2 oz weight gain per day...