This might seem like a weird, ignorant question, but asking this group. What IS the reason for rinsing, boiling, roasting egg shells to be crushed and recycled by the chickens? Is this for human fear( everything has to be sanitized and clean) or something disease related? My thoughts are, chickens eat and play in their own litter, eat all kinds of who knows what when free ranging. How would ingesting their own eggshells hurt them? I just use the eggs, leave the remnant whites to dry, them crush them. Thoughts?