title: Bioavailability of phosphorus from various phosphates based on body weight and toe ash measurements.
abstract: Two experiments involving 1,152 turkeys were conducted to determine the relative bioavailability of phosphorus of eight phosphates from commercial and experimental sources. The basal diet, composed of 52% dehulled soybean meal and 41% ground yellow corn, contained 1.48% calcium and .44% total phosphorus. Phosphorus from the eight sources was added to the basal diet at levels of .09, .18, or .27% to form 24 diets with a constant calcium content. Each diet was fed to one pen of eight males and eight females from 1 to 4 wk of age in the first experiment and to two pens (one of each sex) of 16 poults/pen from 0 to 4 wk of age in the second experiment. Measurements of percentage ash of the middle toe pooled from all poults within a pen and of average body weight at 4 wk of age provided similar relative phosphorus availability values. With the phosphorus in monocalcium phosphate as the standard set at 100%, phosphorus from two sources of dicalcium phosphate and one source of defluorinated phosphate were found not significantly different in bioavailability (95, 105, and 103%, respectively). Phosphorus in curacao phosphate was only 55% available and in the three experimental defluorinated phosphates, phosphorus was 81, 70, and 87% available. Significant differences in bioavailability between two samples greater than 13 and 18% were found when using toe ash and body weight measurement, respectively.
authors: Department of Poultry Science, Virginia Polytechnic Institute and State University, Blacksburg 24061.
authors: L M
authors: LM
authors: Potter
mesh_terms: D000818:Animals; D001682:Biological Availability; D001835:Body Weight; D005260:Female; D008297:Male; D010710:Phosphates / Q000378:metabolism*; D010758:Phosphorus / Q000032:analysis / Q000493:pharmacokinetics*; D014422:Turkeys / Q000378:metabolism*
chemical_list: D010710:Phosphates; D010758:Phosphorus