"Thou shalt only give your chickens 10% of their diet in treats" is a pretty common refrain on these forums, to the point where it's become something of cannon. I don't necessarily subscribe to the theory (which is fine...to each his own), but I did have a question. Saying "10%" isn't very clear when talking about food - does that mean by weight or by volume? Chicken feed has very low moisture content (by design). Food waste has more...ranging from a little more (breads and other carbs) to a LOT more (veggies, especially lettuces and the like). So, how do you calculate your 10%? Or is the difference really not that big, so it's splitting hairs?