So my chickens are around the age of 18 weeks old. Still no eggs, (expected by 25 weeks). So should I put oyster shell in the coop yet? Or is it not necessary? Thanks.
Hens don't consume oyster shell and convert it into eggshells. Your hen uses her dietary calcium to strengthen her bones and virtually ever atom of calcium in every square MM of eggshell first made a scheduled stop in your hens' skeleton.
Keeping animals is a 365 day undertaking and they need what they need when they need it and not when it is convenient for us humans.
Sorry if you find my tone un PC but it is what it is