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 ph...
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Veröffentlicht in: | Poultry science 1988-09, Vol.67 (9), p.1302-1305 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0032-5791 1525-3171 |
DOI: | 10.3382/ps.0671302 |