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I personally don't buy that oyster shells are all that WATER soluble. I'm sure they're soluble in stomach acid, and probably uric acid--why it may dissolve on the floor of a coop. It's used as a soil fertilizer and is valued for being "long lasting" and "slow releasing" of nutrients--keep in...

Excellent information Mavrk! On that point, you're probably right. My 8 birds have used maybe 10# of a 50# bag in 6 months. My chickens do free range some, and our property is fairly rocky, I'd say maybe 5-10% gravels in the top soil (I think there are some relic/abandoned driveways or...

mo puff, rats shouldn't be attracted to grit--it's just crunched up granite, quartzite or similar. I don't think they would be attracted to oyster shell, but they might be attracted to egg shells. If you're concerned, you could try to find limestone grit, which has some calcium so you can pass...

Another thing to mention-- Neither is perishable, so even if there are stretches when the birds aren't taking any, it's not going to spoil! My birds free-range (when people are home) and they always have access to calcium and grit.