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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)

Author
item Mcmurtry, John
item Meisinger, John
item Schmidt, Walter
item Sikora, L.
item Mitchell, Alva
item Shannon, Amy

Submitted to: Southern Poultry Science Society Meeting Abstracts
Publication Type: Abstract only
Publication Acceptance Date: 12/17/1999
Publication Date: N/A
Citation:

Interpretive Summary:

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: 8/24/2016
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