I understand that BOSS is a treat, I never said it wasn't. In fact I was proving that in my post that you quote.Boss should only be an occasional treat . The phosphorous /calcium ratio is important and if the phosphorous levels are too high the body will steal calcium from the bones , beak etc in order to absorb the excess.
http://hoeggerfarmyard.com/calcium-the-key-to-beautiful-eggs-and-healthy-hens/
Yes the Calcium/Phosphorus ratio is important in all animals BUT the rest of your statement is somewhat incorrect.
When Phosphorus levels are high not only will a chickens steal calcium from bones but also every other source that contains Calcium too including nerves, muscles and other organs. Now if the Phosphorus is overly high they must get rid of it through her kidneys.
Now on a Laying Hen will store Calcium in her leg bones, there she extracts the Calcium each time she lays a egg.
Also not only is BOSS high in Phosphorous but so is Flax Seed.