Clarke L C, Sweeney T, Curley E, Duffy S K, Rajauria G, O'Doherty J V
School of Agriculture and Food Science, University College Dublin, Dublin 4, Ireland.
School of Veterinary Medicine, University College Dublin, Dublin 4, Ireland.
J Anim Physiol Anim Nutr (Berl). 2018 Jun;102(3):799-809. doi: 10.1111/jpn.12870. Epub 2018 Jan 23.
This study investigates the effect of dietary supplementation of a β-glucanase and β-xylanase enzyme mix to barley based diets, at two different chemical compositions achieved through different agronomical conditions on growth performance, coefficient of apparent total tract digestibility (CATTD) of nutrients, selected faecal microbial populations and faecal scores in piglets. Sixty-four piglets (11.7 kg (SD 0.96)) housed in pens of two were assigned to one of four dietary treatments (n = 8). The dietary treatments were as follows: (T1) low quality barley diet, (T2) low quality barley diet containing a β-glucanase and β-xylanase enzyme supplement, (T3) high quality barley diet and (T4) high quality barley diet containing a β-glucanase and β-xylanase enzyme supplement. Piglets offered the low quality barley-based diet had a higher (p < .05) average daily gain (ADG) (0.73 vs. 0.69 kg, SEM 0.001), gain:feed (G:F) ratio (0.61 vs. 0.58 kg, SEM 0.011) and a higher CATTD (p < .001) of dry matter (DM), organic matter (OM), nitrogen (N), ash, gross energy (GE) and neutral detergent fibre (NDF) compared with piglets offered the high quality barley diet. Piglets offered the high quality barley-based diet had reduced faecal scores compared to piglets offered the low quality barley-based diet (2.44 vs. 2.57, SEM 0.036) (p < .05). There was a higher population of Lactobacillus spp. (11.6 vs. 10.5 log gene copy number/g faeces, SEM 0.177) (p < .001) and total volatile fatty acid (VFA) concentration (185 vs. 165 mmol/g faeces, SEM 5.658) (p < .001) in the faeces of piglets offered the high quality barley-based diet compared to piglets offered the low quality barley-based diet. The inclusion of a β-glucanase and β-xylanase enzyme complex had no effect on any variable measured. In conclusion, the higher quality barley-based diet showed beneficial effects on the faecal Lactobacillus spp. population and faecal scores of the piglets; however, the higher level of β-glucans in the diet decreased nutrient digestibility and subsequently decreased the performance.
本研究调查了在两种通过不同农艺条件实现的不同化学组成的基于大麦的日粮中，添加β-葡聚糖酶和β-木聚糖酶混合物对仔猪生长性能、养分表观全肠道消化率（CATTD）、选定的粪便微生物种群和粪便评分的影响。将64头仔猪（体重11.7千克（标准差0.96））每两头顶在一栏中饲养，分配到四种日粮处理之一（n = 8）。日粮处理如下：（T1）低质量大麦日粮，（T2）含有β-葡聚糖酶和β-木聚糖酶补充剂的低质量大麦日粮，（T3）高质量大麦日粮，（T4）含有β-葡聚糖酶和β-木聚糖酶补充剂的高质量大麦日粮。与饲喂高质量大麦日粮的仔猪相比，饲喂低质量大麦日粮的仔猪平均日增重（ADG）更高（p < 0.05）（0.73对0.69千克，标准误0.001），增重：饲料（G:F）比更高（0.61对0.58千克，标准误0.011），干物质（DM）、有机物（OM）、氮（N）、灰分、总能（GE）和中性洗涤纤维（NDF）的CATTD更高（p < 0.001）。与饲喂低质量大麦日粮的仔猪相比，饲喂高质量大麦日粮的仔猪粪便评分降低（2.44对2.57，标准误0.036）（p < 0.05）。与饲喂低质量大麦日粮的仔猪相比，饲喂高质量大麦日粮的仔猪粪便中乳酸杆菌属的数量更多（11.6对10.5 log基因拷贝数/克粪便，标准误0.177）（p < 0.001），总挥发性脂肪酸（VFA）浓度更高（185对165毫摩尔/克粪便，标准误5.658）（p < 0.001）。添加β-葡聚糖酶和β-木聚糖酶复合物对所测的任何变量均无影响。总之，高质量的基于大麦的日粮对仔猪粪便中的乳酸杆菌属数量和粪便评分显示出有益影响；然而，日粮中较高水平的β-葡聚糖降低了养分消化率，进而降低了性能。
