One our of 4 Hens at times lays very thin touch and cracks. We feed Cracked Corn, Oyster Shell mixed in maybe we need to do seperately? They r in a 12x12 dog kennel w their lil coop. They are meat/layers big ones but are a tad large. Their Coop is sm even tho it said 4 could live in it, suggestions other than what i have read i guess? They get scraps of vegies, sunflower seeds and mealworms for treats