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United States Department of Agriculture

Agricultural Research Service

Title: Phosphorous Excretion Patterns of Broilers As Affected by Dietary Phosphrorous and Phytase

Authors
item McMurtry, John
item Meisinger, John
item Schmidt, Walter
item Sikora, L. - A. SEFTON, ALLTECH, INC.
item Mitchell, Alva
item Shannon, Amy

Submitted to: Southern Poultry Science Society Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: December 17, 1999
Publication Date: N/A

Technical Abstract: The purpose of this study was to determine the influence of dietary phosphorous (P) and supplemental phytase on total and water soluble P in the excreta of broilers. Male broiler chicks were given either control rations or one of three treatment rations containing phytase (Allzyme Phytase, Alltech, Inc., Nicholasville, KY, 11,500 PTU/kg). The control (no phytase) and Treatment 1 rations contained 1.0% calcium (Ca)-0.45% availableP (aP) in the Starter, 0.9% Ca-0.35% in the Grower. Treatment 2 rations contained 0.9% Ca-0.35% aP in the starter, 0.9% Ca-0.25 aP in the Grower, while Treatment 3 rations contained 0.8% Ca-0.25 in the Starter, 0.7% Ca-0.15% aP in the Grower. Feed intake and body weights were measured weekly. At 3 and 6 weeks of age, 12 birds from each dietary treatment were sacrificed for carcass composition determinations by dual energy X-ray absorptiometry. Excreta samples were collected every other day from 1-6 weeks of age, and analyzed for total and water soluble P in fresh manure. At 6 weeks of age, body weight and feed efficiency did not differ among treatment 3 with the lowest Ca and aP plus phytase had the lowest (28ppm) water soluble P in the manure. Thus manure water soluble P levels can be reduced by reducing aP in the diet and adding phytase, without impairing performance or bone strength. Further, these results show no potential impact on reducing P in manure is derived by the addition of phytase to standard rations without reducing dietary P.

Last Modified: 10/1/2014