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Calcium and phosphorus balance studies were conducted on 29 baby pigs receiving a synthetic milk diet containing phosphorus levels of 02 04 05 06 0.7 and 0.8% with 0.8% calcium. Growth rate, food intake and mineral 'retention were greatly depressed in pigs receiving 0.2% of phosphorus. Increasing dietary phos phorus levels to 0.5% resulted in increased total phosphorus retention (g) and per centage phosphorus retention. Increasing dietary phosphorus levels beyond 0 5% did not increase phosphorus retention (g) but decreased percentage phosphorus retention Dietary phosphorus levels below 0.5% resulted in reduced calcium retention (g) whereas increasing dietary phosphorus levels above 0.5% did not affect calcium bal ance. The dietary phosphorus requirement for optimal utilization of calcium and phosphorus is therefore about 0.5%.

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