The influence of barley particle size and enzyme supplementation on performance, nutrient and energy utilization, and intestinal morphometry of broiler starters (day 1-21) fed pelleted barley-based diets was evaluated. Two barley particle sizes (fine and coarse) and 4 enzyme treatments (nonsupplemented [control], carbohydrase [0.15 g/kg of feed; Carb], phytase [0.10 g/kg; Phy] and combination of carbohydrase and phytase [0.15 and 0.10 g/kg, respectively; Carb + Phy]) were evaluated in a 2 × 4 factorial arrangement. Fine and coarse barley particles were achieved by grinding whole barley in a hammer mill to pass through 2.0 and 8.0 mm screens, respectively. A total of 384, 1-day-old male broilers (8 birds/cage; 6 cages/treatment) were used. Supplemental enzymes tended (P = 0.056) to increase the weight gain of birds with a synergetic effect from Carb + Phy. The response of feed intake to supplemental enzymes interacted (P < 0.05) with barley particle size, as Phy increased feed intake only in fine barley diets. Both coarse particles and supplemental Carb, either individually or in combination with Phy, reduced feed per gain (P < 0.001). Digestibility of DM, nitrogen, and fat was greater in birds fed coarse barley diets (P < 0.05). Dry matter, starch, fat, and phosphorus digestibility values were improved by supplemental enzymes (P < 0.05). Coarse barley (P < 0.05) and Carb (P < 0.001), either individually or in combination, increased the AMEn. Coarse barley reduced the gizzard pH (P < 0.001). Birds fed diets with supplemental enzymes had shorter jejunum (P < 0.05). Neither the barley particle size nor supplemental enzymes (P > 0.05) affected the jejunal digesta viscosity. In summary, feeding coarse barley particles and supplemental Carb improved the feed efficiency and nutrient and energy utilization. The effects of barley particle size on measured parameters suggest that the particle size effect was preserved even after pelleting. The combination of Carb and Phy tended to improve the weight gain but caused no further improvements in nutrient utilization.

中文翻译：

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大麦粒径和酶的添加对肉仔鸡生长性能，养分利用和肠道形态的交互影响。

评估了大麦粒径和添加酶对饲喂大麦粉饲料日粮的肉仔鸡（1-21-2天）的生产性能，营养和能量利用以及肠道形态的影响。两种大麦颗粒大小（精细和粗略）和4种酶处理（不添加[对照]，碳水化合物酶[0.15 g / kg饲料；碳水化合物]，植酸酶[0.10 g / kg; Phy]以及碳水化合物和植酸酶的组合[0.15和0.10]分别以g / kg（Carb + Phy]）进行评估，采用2×4析因排列。通过在锤磨机中将整个大麦磨碎以分别通过2.0毫米和8.0毫米的筛网，可以得到大麦粗粒。总共使用了384只1天大的雄性肉鸡（每笼8只；每笼6只）。倾向于补充酶（P = 0。056），以Carb + Phy的协同作用增加家禽的体重。饲料摄入对补充酶的反应与大麦颗粒大小相关（P <0.05），因为Phy仅在优质大麦饲料中增加饲料摄入量。粗颗粒和补充碳水化合物（单独或与Phy组合）均降低了单位增重的饲料（P <0.001）。用粗大麦饲喂的家禽中的DM，氮和脂肪的消化率更高（P <0.05）。补充酶改善了干物质，淀粉，脂肪和磷的消化率（P <0.05）。单独或组合使用粗大麦（P <0.05）和碳水化合物（P <0.001）可以提高AMEn。粗大麦降低了izz的pH（P <0.001）。用补充酶饮食喂养的家禽空肠更短（P <0.05）。大麦颗粒大小和补充酶（P> 0.05）均不影响空肠消化黏度。总之，饲喂粗大麦粒和补充碳水化合物可以提高饲喂效率以及养分和能量的利用。大麦粒径对测量参数的影响表明，即使在造粒后，粒径效应也得以保留。碳水化合物和Phy的组合往往会增加体重，但并未进一步提高养分利用率。