Department of Animal Sciences, University of Illinois, Urbana, IL.
AB Vista, Marlborough, Wiltshire, SN8 4AN, UK.
Poult Sci. 2018 Jan 1;97(1):211-218. doi: 10.3382/ps/pex291.
An experiment was conducted to evaluate how the addition of microbial phytase influenced growth performance, bone mineralization, tissue P content, apparent digestibility and retention, and inositol phosphate (IP) concentrations in broilers fed diets with varying mineral matrices from 2 to 23 d of age. At 2 d of age, chicks were randomly allotted to receive 1 of 6 experimental diets arranged as a 3 × 2 factorial of mineral matrix [control diet with 1.0% Ca and 0.5% non-phytate phosphorus (NPP); mineral matrix 1 with 0.84% Ca and 0.35% NPP; and mineral matrix 2 with 0.77% Ca and 0.29% NPP] and phytase supplementation (0 or 1,500 FTU/kg). Feed intake was influenced (quadratic, P = 0.012) by the mineral matrix, but no interaction or main effect of phytase were observed. Phytase increased (P = 0.011) BW gain regardless of the mineral matrix applied. Feed efficiency was not influenced (P > 0.05) by mineral matrix, phytase, or their interaction. Phytase increased bone ash content differentially across matrices (interaction, P < 0.01), and tibia P content was lowest in birds fed matrix 2 and highest in the control (linear, P < 0.05). Concentrations of P in muscle, spleen, and liver were not affected by treatment. An interactive effect (P < 0.01) was observed for apparent ileal digestibility (AID) of P, where phytase increased AID in matrix 1. An interactive effect (P < 0.01) was observed for apparent retention of P and Ca, where phytase reduced P and Ca retention in the control diet. A main effect (P < 0.01) of mineral matrix was observed for AID of Ca, with birds fed matrix 1 having the lowest AID of Ca compared with control and matrix 2 treatments. Phytase influenced (P < 0.05) IP concentrations differently across matrices. Overall, phytase and the mineral matrix, either as main effects or in an interactive manner, influenced growth performance, apparent nutrient digestibility and retention, bone and IP concentration responses in broiler chicks.
本试验旨在评估在 2 至 23 日龄期间，饲粮中添加不同矿物基质来源的微生物植酸酶对肉鸡生长性能、骨骼矿化、组织磷含量、表观消化率和存留率以及肌醇六磷酸（IP）浓度的影响。2 日龄时，雏鸡随机分为 6 个试验组，接受 1 种试验饲粮，该饲粮采用 3×2 因子设计，分为矿物基质[对照饲粮含 1.0%钙和 0.5%非植酸磷（NPP）；矿物基质 1 含 0.84%钙和 0.35% NPP；矿物基质 2 含 0.77%钙和 0.29% NPP]和植酸酶添加（0 或 1500 FTU/kg）2 个因子。饲粮采食量受到（二次，P=0.012）矿物基质的影响，但未观察到植酸酶的互作或主效应。无论应用哪种矿物基质，植酸酶都提高了（P=0.011）BW 增益。饲粮效率不受（P＞0.05）矿物基质、植酸酶及其互作的影响。植酸酶对不同基质的骨灰分含量产生了差异影响（互作，P＜0.01），胫骨磷含量在饲粮 2 组最低，在对照组最高（线性，P＜0.05）。处理对肌肉、脾脏和肝脏中的磷含量没有影响。植酸酶对磷的表观回肠消化率（AID）表现出（P＜0.01）的互作效应，其中在基质 1 中提高了 AID。植酸酶对磷和钙的表观存留率表现出（P＜0.01）的互作效应，其中在对照组饲粮中降低了磷和钙的存留率。矿物基质对钙的 AID 表现出（P＜0.01）的主效应，与对照组和基质 2 处理相比，饲粮 1 组的雏鸡钙的 AID 最低。植酸酶对不同基质的 IP 浓度产生了（P＜0.05）的影响。总体而言，植酸酶和矿物基质，无论是作为主效应还是互作效应，都影响肉鸡的生长性能、养分的表观消化率和存留率、骨骼和 IP 浓度反应。
