It helps them grind down foods like grass, scratch, etc... it's necessary if they get ANYTHING else in addition to their regular feed. If they don't have it, they can get impacted crops.
How old are your chickens? If they're chicks, you'll need a smaller grit called chick grit. We get our grit from our feedstore, I get a 50lb pound bag for under $10.00. It'll cost way more at places like rural king and tractor supply.
Granite. The chick grit is colored red so it's easier for them to find.. probally attracts them to it too. The regular grit that I have is white. Our feedstore has 2 different sizes too.
It helps them grind down foods like grass, scratch, etc... it's necessary if they get ANYTHING else in addition to their regular feed. If they don't have it, they can get impacted crops.
A chicken will not get a impacted crop from no grit. Grit is used in the gizzard to grind food. The crop is a storage contaner for food only!!