Abstract
When P is deficient in the diet of sheep there is an increased output of urinary N, the exogenous N metabolism being unaffected and the endogenous N metabolism being diminished. In the P deficient periods there is a loss of both Ca and P, but this is remedied by the addition of a supplement of P. With abnormally high Ca:P ratio in the diet there is an increased output of urinary N even when the total food intake is lower.

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