J. Appl. Poult. Res.
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J APPL POULT RES 1992. 1:167-171
© 1992 Poultry Science Association
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Research Reports

Effect of Calcium and Nonphytate Phosphorus Levels Fed During 42 to 56 Days of Age on Performance and Bone Strength of Male Broilers

J. T. Skinner, M. H. Adams, S. E. Watkins and P. W. Waldroup

Department of Poultry Science, University of Arkansas, Fayetteville, AR 72701; Phone: (501) 575-2065; FAX: (501) 575-7294

Correspondence: P. W. Walsroup

Two identical trials were conducted to determine the optimum level of calcium in conjunction with reduced levels of nonphytate phosphorus (NPP) in diets for male broilers during 42 to 56 days of age. Diets containing . 12% and . 24% NPP, and calcium levels ranging from . 06 to . 60%, were compared to a control diet that contained . 80% Ca and . 35% NPP.

Body weight gain, feed consumption, feed conversion, and mortality of male broilers that were fed the treatment diets did not differ significantly from those of broilers that were fed the control diet. All dietary treatments produced birds with visual leg abnormalities, but there were no significant differences among treatments. Diets with reduced levels of Ca and NPP fed to birds during the 42- to 56-day period did not adversely affect tibia length and width when compared to those fed the control diet. At a Ca level of . 48%, tibia strength of broilers fed diets with . 12 or . 24% NPP did not differ significantly from that of broilers fed the control diet. Raising dietary Ca to . 60% did not further increase tibia strength when diets contained . 12% NPP, but it did increase tibia strength significantly when diets contained . 24% NPP.

Key Words: Broilers • calcium phosphorus • finisher diets






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