title: Biological values of phosphorus from various sources for young turkeys.
abstract: Two experiments, each utilizing 540 turkeys, were conducted to determine the biological value of phosphorus from 13 different sources when compared with that from dicalcium phosphate (dihydrate, purified) as a standard. Each phosphorus source was added to a basal diet composed of 44% ground yellow corn and 52% dehulled soybean meal to supply .09, .18, .27, or .45% inorganic phosphorus. Each of 60 diets, which included duplicates of the standard source, was fed to a pen of 9 male poults from 1 day to 3 weeks of age in each experiment. Body weight and toe ash measurements of poults collected at 3 weeks of age were used in nonlinear (exponential) bioassays to obtain relative biological values of phosphorus from various sources. With the dicalcium phosphate standard set at 100%, the average relative biological values of three samples from each of commercial monocalcium phosphate (21% P), dicalcium phosphate (18.5% P), and defluorinated phosphate were 93, 81, and 70%, respectively. Four samples of experimental defluorinated phosphate averaged 75%. Differences of about 5% between values were required for statistical significance, indicating significant differences among these biological values of phosphorus from the various phosphate sources in diets of young turkeys.
mesh_terms: D000818:Animals; D001682:Biological Availability; D002130:Calcium Phosphates / Q000378:metabolism*; D008297:Male; D009753:Nutritive Value; D010758:Phosphorus / Q000378:metabolism*; D014422:Turkeys / Q000378:metabolism*
chemical_list: D002130:Calcium Phosphates; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; D010758:Phosphorus; C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous