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There just might be something to giving the cod liver oil-you need vitaming D to absorb calcium, and perhaps some chickens need more of this nutrient than others to absorb the calcium from oyster shells, etc, especially in the wintertime, when the sun doesn't shine as much to give us that natural vitamin D, as the summer. Cod liver oil has both vitamin A & D. But you will need to look on the back of the bottle-so many companies today remove things out of the Cod Liver Oil to make it appealing to take, that it is not the nutritious remedy that our grandparents used to take. If it doesn't give the amount of Vit. A & D it has in it, don't buy it. You may need to find the correct kind in either the health food section of a grocery store, or an actual health food store.