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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2009 > Volume 8 Number 10 > M.K. Manangi1, J.S. Sands2 and C.N. Coon1

Effect of Adding Phytase to Broiler Diets Containing Low and High Phytate Phosphorus: 1. Performance, Phytate P Hydrolysis, Tibia Ash, Litter Phosphorus and Ca and P Digestion and Retention

M.K. Manangi1, J.S. Sands2 and C.N. Coon1
1Center of Excellence for Poultry Science, University of Arkansas, Fayetteville, Arkansas, 72701, USA 2Danisco Animal Nutrition, Marlborough, Wiltshire, SN8 1XN, UK
Abstract :

A 42 d broiler experiment was conducted to determine the effect of added Escherichia coli phytase
(Phyzyme-XP 5000G) to low and high phytate P (PP) diets on performance and nutrient digestibility. The
experiment consisted of 12 treatments with 2 levels of PP: Low-Phytate (LP) group-0.24% and High-Phytate (HP) group-0.32%. Both LP and HP groups had respective Positive Controls (PCs) with 0.39% in the starter and 0.29% NPP in the grower, respectively and 5 basal diets with graded levels (0, 250, 500, 750 and 1000 FTU’s/kg diet) of added phytase. The HP diets contained additional PP because canola and rice bran were substituted for part of the corn and soybean meal. A significant (p<0.001) phytase effect was found for Body Weight Gain (BWG) Feed Intake (FI) and Feed:Gain (F:G) ratio on d 42 and ileal P digestibility and % tibia ash for both LP and HP groups on d 42. Supplementation of 250 FTU’s phytase/kg diet for both LP and HP basal diets produced equivalent body weights (p>0.05) to comparable respective PCs. Supplementing 500 FTU’s phytase/kg diet in both LP and HP groups resulted in a comparable (p>0.05) % tibia ash to respective PC groups. The litter Total Dissolved P (TDP) and Water-Soluble P (WSP) of pens from broilers fed either the LP or HP basal diets with increasing concentrations of phytase were not significantly different (p>0.05) compared to the respective PCs. The research shows that adding feed phytase does not necessarily mean that TDP and WSP will be reduced. The P equivalency determined from 42d ileal digesta for added phytase with the LP and HP diets showed that broilers fed the HP diet with 1000 FTU phytase provided 0.17% digestible P compared to 0.13% digestible P from the LP diet. In order to decrease P excretion in broilers, added feed phytase should be considered equal to feed phosphates for providing available P in the  gastrointestinal tract and the combination needs to be low enough for optimum performance and  retention.

Keywords :
Phytase, phytate P, phytase P equivalency value, litter total dissolved P, litter water soluble P

Date Deposited : 06 Jul 2011 12:43

Last Modified : 06 Jul 2011 12:43

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Volume 8, Number 10, - 2009 , ISSN 1682-8356

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