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Models and predicted values, based on the linear and quadratic effect of Ca (P < 0.01) and the linear effect of P (P < 0.01), for (a) plasma Ca (mg/dL) and based on the interactions between Ca and P (P < 0.01), (b) for plasma P (mg/dL) at d 21 in pigs fed diets containing from 0.14% to 0.74% standardized total tract digestible (STTD) Ca and from 0.16% to 0.50% STTD of P
