TY - JOUR
T1 - Effects of phytase supplementation on energy and nutrient availability, and phytate degradation in turkeys
AU - Pirgozliev, V.
AU - Mansbridge, S. C.
AU - Watts, E. S.
AU - Whiting, I. M.
AU - Rose, S. P.
AU - Brearley, C. A.
AU - Bedford, M. R.
N1 - Funding information: Charles Brearley was supported by grant BB/ N002024/1 from BBSRC.
PY - 2025/5/16
Y1 - 2025/5/16
N2 - The study aimed to investigate the effect of graded levels of supplementary phytase (PHY) on energy and nutrient availability, and phytate (IP6) degradation of rapeseed meal (RSM) containing, wheat-based diets in turkeys. A control diet containing 6.8 g/kg available P (positive control; PC), a low-P diet containing 5.3 g/kg available P (negative control; NC) and a diet produced by mixing 810 g of the NC with 190 g industry produced RSM containing 5.6 g/kg available P (RSM diet) were produced. The NC and the RSM diets were then split in four parts each and PHY was added at 0, 500, 2500 and 12500 FTU/kg, respectively, resulting in nine diets in total. Feed intake (FI), weight gain (WG), and feed conversion ratio (FCR), from 27 to 35 d age, AMEn, retention coefficients for dry matter (DMR), nitrogen (NR), fat (FR), Ca (CaR), P (PR) and the profile of inositol phosphate esters (IP3-6) and myo-inositol (MYO) in excreta were determined. There was a positive quadratic relationship (P < 0.05) between dietary PHY activity and daily FI, as dosage of 2500 FTU was the optimum for FI. Feeding RSM reduced daily weight gain (P < 0.05) and feed efficiency (P < 0.001). Dietary AMEn increased linearly with PHY supplementation (P < 0.05) although feeding RSM reduced (P < 0.001) AMEn. Compared to NC, the PC had greater AMEn, DMR, CaR, PR, (P < 0.001) and NR (P < 0.05). Dietary CaR and PR linearly increased (P < 0.001) with PHY dosage which coincided with a decrease in IP5 and IP6 isomers (P < 0.001). The response to PHY followed curvilinear shape for IP4 (P < 0.001) and IP3 (P = 0.001) isomers.
AB - The study aimed to investigate the effect of graded levels of supplementary phytase (PHY) on energy and nutrient availability, and phytate (IP6) degradation of rapeseed meal (RSM) containing, wheat-based diets in turkeys. A control diet containing 6.8 g/kg available P (positive control; PC), a low-P diet containing 5.3 g/kg available P (negative control; NC) and a diet produced by mixing 810 g of the NC with 190 g industry produced RSM containing 5.6 g/kg available P (RSM diet) were produced. The NC and the RSM diets were then split in four parts each and PHY was added at 0, 500, 2500 and 12500 FTU/kg, respectively, resulting in nine diets in total. Feed intake (FI), weight gain (WG), and feed conversion ratio (FCR), from 27 to 35 d age, AMEn, retention coefficients for dry matter (DMR), nitrogen (NR), fat (FR), Ca (CaR), P (PR) and the profile of inositol phosphate esters (IP3-6) and myo-inositol (MYO) in excreta were determined. There was a positive quadratic relationship (P < 0.05) between dietary PHY activity and daily FI, as dosage of 2500 FTU was the optimum for FI. Feeding RSM reduced daily weight gain (P < 0.05) and feed efficiency (P < 0.001). Dietary AMEn increased linearly with PHY supplementation (P < 0.05) although feeding RSM reduced (P < 0.001) AMEn. Compared to NC, the PC had greater AMEn, DMR, CaR, PR, (P < 0.001) and NR (P < 0.05). Dietary CaR and PR linearly increased (P < 0.001) with PHY dosage which coincided with a decrease in IP5 and IP6 isomers (P < 0.001). The response to PHY followed curvilinear shape for IP4 (P < 0.001) and IP3 (P = 0.001) isomers.
U2 - 10.1016/j.psj.2025.105309
DO - 10.1016/j.psj.2025.105309
M3 - Article
SN - 0032-5791
JO - Poultry Science
JF - Poultry Science
M1 - 105309
ER -