To improve the efficiency of nutrient utilization in defatted rice bran (DRB) used as animal feed ingredient, the effects of enzyme supplementation and extruding process on the coefficient of apparent ileal digestibility (CAID) and apparent total tract digestibility (CATTD) of nutrients and nutraceutical phenolic acids were evaluated using growing pigs (initial body weight = 18 ± 1.2 Kg) permanently fitted with ileal T-cannula. The extruded DRB ingredient (EDRB) was prepared by extruding the DRB ingredient at 130–135 °C using a single-screw extruder. The enzyme preparation contained cellulase, xylanase, phytase, and ferulic acid esterase. Eight cannulated pigs were allocated according to a 4 × 4 double Latin square arrangement. In each period, 1 of 4 tested diets, i.e., DRB basal diet, EDRB basal diet, and their enzyme added counterparts were randomly distributed to 2 pigs (1 pig form each square). The feces were sampled on the 6th and 7th day, and the ileal digesta were collected on the 8th, 9th and 10th day in each period. The results shown that pigs fed EDRB containing diets exhibited higher CAID values of dry matter (DM), organic matter (OM), gross energy (GE), and ether extract (EE) (P <0.001), and CATTD values of DM, OM, GE, crude protein (CP) and EE (P <0.002) comparing with that of DRB containing items. The CATTD values of most NSP fractions and their constituent residues in EDRB diets were positively affected by the extruding process; however, only the CAID values of insoluble arabinose and xylose were increased (P < 0.05). Enzyme inclusion improved the CAID of DM, OM, GE, ash, Ca, total phosphorus (TP) and phytate phosphorus (PP, P <0.05), and the CATTD of ash, Ca, TP, PP, and Mg (P <0.05). The added enzyme increased the digestion of NSP fractions in the foregut of pigs whereas the effect was not obvious in the large intestine of pigs except for insoluble arabinose. The enzyme addition did not show any effect on the CAID and CATTD of CP, and the CAID of amino acids in the rice bran containing diets. On the contrary, the CAID of amino acids were decreased and the CATTD of CP was increased by the extruding process. To sum up, the extruding temperature adopted in this study (130–135 °C) was too high for DRB processing with the aim of improving the efficiency of amino acids utilization, while it was helpful to improve the digestion of most of gross nutrients and NSP fractions over the whole digestive tract of pigs.

为了提高用作动物饲料成分的脱脂米糠（DRB）的养分利用率，酶的添加和挤压过程对养分和营养素的表观回肠消化率（CAID）和表观总道消化率（CATTD）的影响使用永久装有回肠T型插管的生长猪（初始体重= 18±1.2 Kg）评估酚酸。通过使用单螺杆挤出机在130–135°C下挤出DRB成分来制备挤出的DRB成分（EDRB）。该酶制剂包含纤维素酶，木聚糖酶，植酸酶和阿魏酸酯酶。根据4×4双拉丁方形布置分配八头空心猪。在每个时期中，测试的4种饮食中有1种，即DRB基础饮食，EDRB基础饮食，并将其添加酶的对应物随机分配到2头猪（每平方1头猪）。在每个时期的第6和7天取样粪便，并在第8、9和10天收集回肠消化物。结果表明，饲喂含EDRB日粮的猪的干物质（DM），有机物质（OM），总能量（GE）和乙醚提取物（EE）的CAID值较高（P < 0.001），而DM，OM，GE，粗蛋白（CP）和EE的CATTD值（P < 0.002）与包含DRB的物品相比。EDRB日粮中大多数NSP组分及其构成残留物的CATTD值受到挤压过程的积极影响。然而，仅不溶性阿拉伯糖和木糖的CAID值增加（P <0.05）。酶的掺入改善了DM，OM，GE，灰分，Ca，总磷（TP）和植酸磷（PP，P < 0.05）的CAID，以及灰分，Ca，TP，PP和Mg的CATTD（P <0.05）。添加的酶增加了猪前肠中NSP组分的消化，而除不溶性阿拉伯糖外，这种作用在猪大肠中并不明显。添加酶对CP的CAID和CATTD以及含饮食的米糠中氨基酸的CAID没有显示任何影响。相反，通过挤出过程，氨基酸的CAID减少，CP的CATTD增加。综上所述，本研究采用的挤压温度（130–135°C）对于DRB加工而言太高，目的是提高氨基酸利用效率，同时有助于改善大部分总养分和脂肪的消化率。 NSP在整个猪消化道中的比例。