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SUMMARY The available data on calcium, phosphorus and carbonate balance experiments with laying and non-laying birds have been collected and condensed. From this condensed data the following relationships have been derived: (1) Calcium excretion is a function of calcium intake. (2) Phosphorus excretion is a function of phosphorus intake. (3) Carbonate excretion is a function of carbonate intake. (4) Carbonate/calcium ratio of the excreta is a function of carbonate/calcium ratio of the intake. (5) Calcium/phosphorus ratio of the excreta is a function of calcium/phosphorus ratio of the intake.
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C. Tyler (1948) studied this question.
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