Purina Mills® Ground Oyster Shell
Oyster shell is sometimes fed to chickens because it is an excellent source of calcium. Purina Mills® complete feeds are formulated to meet calcium requirements so supplemental oyster shell is usually unnecessary.
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However, for older hens in hot weather, particularly those laying larger eggs, extra calcium may be beneficial. In this instance, a small amount of oyster shell can be fed at 1 pound per 100 hens daily. Over-supplementing with oyster shell should be avoided since too much calcium in the diet can lead to the same symptoms as a calcium deficiency and include weak or soft shells and reduced egg production.