I have a mix i make up myself every year, my doos run up and down with their wings spread like young birds when i put it down to them, every day after feeding. I just drop a few handful's ( 4/5 )on the loft floor between 60 birds. I suppose what i give them would weigh about 6 Oz. Basically it is 50% grit and broken pick blocks/pick stones, the 0ther 50% is of kibbled peanuts, hemp, red band, hormoform, Red Vita minerals and black minerals. I get the bath out and mix about 20kg's of this and it does me for the old bird season, though my Yb's get it too after feeding.