Only thing with that theory is the bigger bossy gals get it all scarfed back in 20 min leaving just the grit and pellets. I only feed a small feeder full of it, one of those feeders used with chicks. With 32 birds it gets emptied fast! The feed is a layer ration, 17% textured layer - so it has the calcium added with the limestone grit and in the pellets - they pick at it but yep finish off the grains first thing.
Their main feed is the 17% pelleted layer.
And as per the Vet, I have not given any table scraps and treats at all, she only get an hr or so of grass outside in the evening; I feed the morning porridge once again mixed with the high protein supplement which also has calcium for layers.
And she is still getting calcium every other night, have to be careful with over doing calcium though, it can affect the heart. Calcium is use in muscle contractions which is why dairy cows get ‘milk fever’ where they have low calcium levels after they calve, they are mot able to stand up and will die if they don’t get calcium. An intravenous dose of calcium and it’s like a miracle - they stand up and walk away! But too much and they can have a heart attack.