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Variation in Phytate Phosphorus Utilization within the Same Broiler Strain

Department of Poultry Science, Auburn University, Auburn, AL 36849-5416; Phone: (334) 844-2605; FAX: (334) 844-2641

Correspondence: D. A. Roland, Sr.

This study evaluated the variation in ability to utilize phytate phosphorus among individual birds of the same strain of broilers. A 4-wk feeding trial was conducted with 100 day-old male broilers. Of these, 20 broilers were fed 0.5% available phosphorus (aP) and 0.95% Ca as the control and 80 broilers were fed a phosphorus-deficient diet containing 0.1% aP and 0.45% Ca. Livability, feed consumption, growth rate, and bone quality were the criteria used to test the effect of phytate P utilization. By the end of Week 2, some broilers fed 0.1% aP shoed lower feed consumption, severely reduced growth, and leg problems as a sign of sever P-deficiency, whereas some other birds showed normal growth, no leg weakness, and no visual signs of P-deficiency. Phytate P analysis of manure collected at the end of Weeks 2 and 4 revealed that broilers that showed normal growth (identified as "larger" birds) within the P-deficient group, utilized significantly more phytate P than the birds with stunted growth (identified as "smaller" birds). Bone analysis also showed that the larger birds had stronger bones than the smaller birds. Broilers fed P-deficient diets utilized significantly more phytate P than those fed diets containing 0.5% aP. Results suggest that the variation in individual bird's ability to respond to a phosphorus deficiency was related to variation in ability to utilize phytate P.

Key Words: Available phosphorus • broilers • phytate phosphorus • strain • variation

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