Precipitated bone phosphate in broiler chick diets.
Day-old Cobb x Cobb broiler chicks were housed in battery brooders for 21-day feeding periods during two experiments. Dietary treatments consisted of a corn-soybean starter feed (.37% total; .14% nonphytin phosphorus) supplemented with 0, .05, .10, .15, or .28% phosphorus in the form of dicalcium phosphate, precipitated bone phosphate, or a mixture of soft and precipitated phosphates (each providing 50% of the phosphorus addition). Total dietary calcium was held constant at .90%. Comparable dietary phosphorus from precipitated bone and the soft-precipitated mixture supported body weights statistically equivalent to those of dicalcium phosphate treatments. Tibia ash results at suboptimal phosphorus levels, with one exception, indicated statistically equal utilization from the soft-precipitated combination. Slope-ratio techniques using tibia ash and total nonphytin phosphorus intake established the bioavailability of phosphorus from precipitated bone was 120% when dicalcium phosphate was the standard. The data indicate that precipitated bone phosphate for broilers was fully equivalent in performance to dicalcium phosphate. Providing one-half the supplemental phosphorus from both soft phosphate and precipitated bone seemed to be an acceptable method of meeting practical phosphorus requirements.
Damron
B L
BL
Department of Poultry Science, University of Florida, Gainesville 32611.
Flunker
L K
LK
D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001835:Body Weight / Q000187:drug effects*; D002130:Calcium Phosphates / Q000494:pharmacology; D002645:Chickens / Q000254:growth & development*; D004032:Diet; D005260:Female; D008297:Male; D010710:Phosphates / Q000494:pharmacology*
D002130:Calcium Phosphates; D010710:Phosphates; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous