Abstract
At about 16 mg, zinc per 100 gm of diet feed consumed by laying hens increased until a level of 2.0% dietary calcium. Increasing the dietary calcium to 2.0% also stimulated more egg production. When less than 2.0% dietary calcium was fed more feed was required to produce a dozen egg and the eggs were of small sizes. The egg shell strength and the bone calcium were improved when at least 2.0% dietary calcium was given to the laying hen. These results were correlated with tissue accumulation of zinc thus establishing that for profitable egg production in the tropics 2.0% dietary calcium is required when 16 mg zinc per 100 grains of feed is given
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