Can hens get too much calcium? I have 4 RIRs that are laying and I give about 1 quarter cup pulverized shells mixed in yogurt every 3 days They eat the whole thing. They free range and eat grower feed. I had a hen that was egg bound due to soft shell, but she passed it along with a shell less at the same time No problems since giving them shells. I can't mix in with the feed as the pullets will eat it too. Am I giving them too much?