I am new to owning chicken and I'm learning as I go. Today, one of my hens laid our first egg, and I am so stoked about it! In total, we have 7 hens. If the other hens don't start laying soon, do I still provide the laying hen with crushed egg shells or oyster? Will the others avoid eating it? Also, are crushed egg shell and oyster the same in calcium? Or is one better than the other?