Iowa State University Nutrition Dietary Available Phosphorus Needs of High Lean Pigs

Pigs from a high lean strain reared via a segregated early wean (SEW) scheme were self-fed a corn-soybean meal-based diet containing one of five dietary available phosphorus (AP) concentrations (.30,.40,.50,.60, and.70%) from bodyweights of 7 to 23.5 kg. The dietary AP concentrations were achieved by the addition of mono-dicalcium phosphate. Dietary available phosphorus concentrations of.70,.50, and.50 % were required for maximum growth rate at 8.9, 15.6, and 22.3 kg, respectively. Furthermore, efficiency of feed utilization was optimized at dietary AP concentrations of.70 % throughout the study. The results of this study suggest that dietary AP concentrations for high lean pigs is 1.7 to 2.3 times greater than the current NRC (1) estimations for pigs in similar stages of growth