Pirgozliev V, Mansbridge S C, Watts E S, Whiting I M, Rose S P, Brearley C A, Bedford M R
National Institute of Poultry Husbandry, Harper Adams University, Newport, Shropshire, UK.
National Institute of Poultry Husbandry, Harper Adams University, Newport, Shropshire, UK.
Poult Sci. 2025 May 16;104(11):105309. doi: 10.1016/j.psj.2025.105309.
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.
本研究旨在探讨不同水平的补充植酸酶（PHY）对以小麦为基础的含菜籽粕（RSM）日粮中能量和养分利用率以及植酸（IP6）降解的影响。制备了一种含6.8 g/kg有效磷的对照日粮（阳性对照；PC）、一种含5.3 g/kg有效磷的低磷日粮（阴性对照；NC）以及一种由810 g NC与190 g含5.6 g/kg有效磷的工业生产的RSM混合而成的日粮（RSM日粮）。然后将NC日粮和RSM日粮各分成四份，分别添加0、500、2500和12500 FTU/kg的PHY，共得到九种日粮。测定了27至35日龄期间的采食量（FI）、体重增加（WG）、饲料转化率（FCR）、表观代谢能（AMEn）、干物质保留系数（DMR）、氮保留系数（NR）、脂肪保留系数（FR）、钙保留系数（CaR）、磷保留系数（PR）以及排泄物中肌醇磷酸酯（IP3 - 6）和肌醇（MYO）的含量。日粮PHY活性与每日FI之间存在正二次关系（P < 0.05），2500 FTU的剂量是FI的最佳剂量。饲喂RSM降低了每日体重增加（P < 0.05）和饲料效率（P < 0.001）。日粮AMEn随PHY添加呈线性增加（P < 0.05），尽管饲喂RSM降低了（P < 0.001）AMEn。与NC相比，PC具有更高的AMEn、DMR、CaR和PR（P < 0.001）以及NR（P < 0.05）。日粮CaR和PR随PHY剂量呈线性增加（P < 0.001），这与IP5和IP6异构体的减少（P < 0.001）相吻合。IP4（P < 0.001）和IP3（P = 0.
