J. Anim Sci.
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J. Anim Sci. 1983. 57:1173-1181.
© 1983 American Society of Animal Science
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Phosphorus Bioavailability in the Chick: Effects of Protein Source and Calcium Level

R. L. Harrold, W. D. Slanger, C. N. Haugse and R. L. Johnson

North Dakota State University1, Fargo 58105

Abstract

Three experiments utilizing 1,104 broiler cockerels were conducted to establish optimum dietary conditions for the determination of phosphorus (P) bioavailability. The reference P source was KH2 PO4. A response-surface design and purified diets containing casein as the protein source were utilized in Exp. 1. Various levels of calcium (Ca) and P supported near-maximal gain in tibia ash. Optimal gain in tibia ash was attained at 1.8% Ca and .55% total (highly available) P. Regression equations describing the gain in tibia ash in response to added P from KH2P04 for diets in Exp. 2 that contained casein and isolated soybean protein had different (P<.05) slopes. Diets moderately limiting in available P exhibited reduced gain in tibia ash content if more than 1.4% total Ca was present. A corn-soybean meal diet was utilized in Exp. 3. Partitioning of tibia ash gain into effects due to basal diet, added P from KH2PO4, or P from the test ingredient was investigated. Sunflower meals containing 42 or 28% crude protein were evaluated for P bioavailability. The P content of the meals was 21.6 and 22.7% available, respectively. The fiber of the sunflower hull did not interfere with P availability. Selection of diet ingredients is discussed with respect to the development of P bioavailability values for use in practical diets.

Footnotes

1 Dept. of Anim. Sci.






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Copyright © 1983 by the American Society of Animal Science.