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Effect of different phytases derived from E. coli AppA gene on the performance, bone mineralisation and nutrient digestibility of broiler chicken

Published online by Cambridge University Press:  07 August 2019

K. Kozlowski ,
L. Nollet ,
A. Lanckriet ,
E. Vanderbeke ,
P. Mielnik ,
N. Outchkourov  and
S. Petkov
K. Kozlowski
Affiliation:
University of Warmia and Mazury, Department of Poultry Science, Olsztyn, Poland
L. Nollet*
Affiliation:
Huvepharma NV, Antwerp, Belgium
A. Lanckriet
Affiliation:
Huvepharma NV, Antwerp, Belgium
E. Vanderbeke
Affiliation:
University of Warmia and Mazury, Department of Poultry Science, Olsztyn, Poland
P. Mielnik
Affiliation:
University of Warmia and Mazury, Department of Poultry Science, Olsztyn, Poland
N. Outchkourov
Affiliation:
Huvepharma EOOD, Sofia, Bulgaria
S. Petkov
Affiliation:
Huvepharma EOOD, Sofia, Bulgaria
*
Corresponding author: [email protected]
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Abstract

This study evaluated the effects of three different thermostable phytase variants, based on the AppA gene from E. coli (AppAT1, AppAT2 and AppAT3) on growth performance, nutrient digestibility and bone mineralisation in broiler chickens at inclusion levels of 250 and 500 FTU/kg. The eight treatment groups included a positive control (PC) which was sufficient in Ca and P, a negative control (NC, the same basal formulation as the PC, but reduced in Ca and P), and NC supplemented with AppAT1 at 250 and 500 FTU/kg (AppAT1-250 and AppAT1-500), AppAT2 at 250 and 500 FTU/kg (AppAT2-250 and AppAT2-500) and with AppAT3 at 250 and 500 FTU/kg (AppAT3-250 and AppAT3-500). Over the entire feeding period, body weight (BW) and average daily gain (ADG) were significantly higher in the PC group, with all phytase supplemented groups being statistically the same, compared to the NC group. Feed conversion (FCR) for the PC-fed birds (1.479) was significantly (P<0.05) better compared to the NC birds (1.582) and those fed the AppAT3-250 diet (1.523). Reduced levels of Ca and P in the NC group led to significantly (P<0.05) lower tibia ash (40.9%) compared to the PC group (47.4%). Birds fed the phytase diets had significantly higher tibia ash compared to the NC birds, with those from the AppAT2-500 and AppAT3-500 groups being statistically the same as the PC group. Diets AppAT1-500, AppAT2-250, AppAT2-500 and AppAT3-500 significantly increased Ca digestibility compared to the NC. Apparent total track digestibility (ATTD) of P was improved for AppAT1-500 and AppAT2-250. The ATTD of Ca and P for all of the phytase supplemented groups reached the same level of the PC and AppAT1-500 group. It was concluded that adding any of the phytases tested, especially when included at 500 FTU/kg to a feed reduced in Ca and P, led to improved performance and bone mineralisation back to the same levels as seen for the Ca and P sufficient diet.

Keywords

PhytaseE. colibroilerdigestibilityphytate
Type
Original Research
Information
Journal of Applied Animal Nutrition , Volume 7 , 2019 , e7
Copyright
Copyright © Cambridge University Press and Journal of Applied Animal Nutrition Ltd. 2019 

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