Sanchez Juan, Thanabalan Aizwarya, Khanal Tanka, Patterson Rob, Slominski Bogdan A, Kiarie Elijah
Department of Animal Biosciences, University of Guelph, Guelph ON N1G 2W1, Canada.
Canadian Bio-Systems Inc., Calgary AB T2C 0J7, Canada.
Anim Nutr. 2019 Mar;5(1):41-48. doi: 10.1016/j.aninu.2018.12.001. Epub 2018 Dec 27.
We investigated the effects of adding up to 11% rice bran (RB) in corn-soybean meal diets fed to broiler chickens without or with a multi-enzyme supplement (MES). The MES supplied xylanase, β-glucanase, invertase, protease, cellulase, α-amylase and mannanase with targeted activity of 2,500, 300, 700, 10,000, 1,200, 24,000, and 20 U/kg of feed, respectively. The study used a two-phase feeding program (starter, d 0 to 24; finisher, d 25 to 35) with RB added at 5% and 11%, respectively creating 4 diets in each phase. Diets were iso-caloric and iso-nitrogenous and contained phytase (500 FTU/kg) and TiO as a digestibility marker. Three hundred and sixty d-old male Ross 708 broiler chicks were placed in cages based on BW (15 birds/cage) and allocated to 4 diets ( = 6). Birds had free access to feed and water. Body weight and feed intake were recorded. Excreta samples were collected 3 d prior to the end of each phase for apparent retention (AR) of components. Samples of birds were sacrificed on d 24 and 35 for gut weight and ceca digesta for organic acid content. There was no interaction ( > 0.10) between RB and MES on BWG and FCR in starter or finisher phase. In finisher phase, birds fed MES had better BWG (961 versus 858 g) and FCR (1.69 versus 1.86) than birds fed non-MES diets ( < 0.01). Feeding RB reduced ( = 0.02) BWG in finisher phase resulting in lower d 35 BW. Birds fed RB had higher ( ≤ 0.01) gizzard weight on d 24 and 35 than non-RB birds. An interaction ( ≤ 0.01) between RB and MES on concentrations of propionic and iso-butyric acids in ceca digesta showed that MES reduced these acids in non-RB diet. The AR of gross energy was higher ( < 0.02) for MES versus non-MES birds in starter and finisher phases. In conclusion, independently, RB increased gizzard weight and reduced final BW whereas MES improved growth and energy utilization.
我们研究了在玉米-豆粕型日粮中添加高达11%的米糠（RB）对肉鸡的影响，这些肉鸡日粮中添加或不添加复合酶制剂（MES）。MES提供木聚糖酶、β-葡聚糖酶、转化酶、蛋白酶、纤维素酶、α-淀粉酶和甘露聚糖酶，其目标活性分别为每千克饲料2500、300、700、10000、1200、24000和20 U。本研究采用两阶段饲养方案（0至24日龄为育雏期；25至35日龄为育肥期），分别添加5%和11%的RB，每个阶段各形成4种日粮。日粮为等热量和等氮量，并含有植酸酶（500 FTU/kg）和二氧化钛作为消化率标记物。360只1日龄雄性罗斯708肉鸡根据体重（每笼15只）放入笼中，并分配到4种日粮（每组6个重复）。鸡可自由采食和饮水。记录体重和采食量。在每个阶段结束前3天收集排泄物样本，用于测定各成分的表观存留率（AR）。在24日龄和35日龄时宰杀鸡只，以获取肠道重量和盲肠内容物的有机酸含量。在育雏期或育肥期，RB和MES对肉鸡体重增长（BWG）和饲料转化率（FCR）均无交互作用（P>0.10）。在育肥期，饲喂MES的鸡只比未饲喂MES日粮的鸡具有更好的BWG（961克对858克）和FCR（1.69对1.86）（P<0.01）。饲喂RB会降低育肥期的BWG（P=0.02），导致35日龄体重降低。在24日龄和35日龄时，饲喂RB的鸡的肌胃重量高于未饲喂RB的鸡（P≤0.01）。RB和MES对盲肠内容物中丙酸和异丁酸浓度存在交互作用（P≤0.01），表明MES可降低未添加RB日粮中的这些酸。在育雏期和育肥期，饲喂MES的鸡的总能表观存留率高于未饲喂MES的鸡（P<0.02）。总之，单独来看，RB增加了肌胃重量并降低了最终体重，而MES改善了生长性能和能量利用效率。
