If you notice that your hens are laying eggs with very thin shells, this is usually due to calcium deficiency. This may occur when if you give your flock more food scraps than formulated chicken feed. One way of giving your chickens more calcium is by offering them crushed oyster shells.
If you are looking to save some money you can reuse old egg shells by washing, crushing them and putting them in the oven. Set the oven at 350 degrees and let them bake for 5 to 10 minutes.
To read more in detail about calcium deficiency in chickens, read “Detecting and solving a calcium deficiency in chickens” from Red Feather Farm.net. For more on feeding eggshells to chickens read, “How to Feed Eggshells to Chickens” from The Prairie Homestead.com.