1. A 21-d experiment was conducted to investigate the effect of graded inclusions of waxy starch hull-less (WSHL) barley and a multi-component exogenous carbohydrase on the growth performance, nutrient digestibility and intestinal morphometry of broiler chickens. Five levels of WSHL barley inclusion (0, 65, 130, 195 and 260 g/kg) in a wheat-based diet, and two levels of enzyme supplementation (0 and 150 g/tonne of feed) were evaluated in a 5 × 2 factorial arrangement of 10 dietary treatments. All diets were equivalent in metabolisable energy and digestible amino acid content. A total of 400, one-d-old male broilers (five cages/treatment; eight birds/cage) were used in the experiment.

2. Regardless of enzyme supplementation, feed intake declined (P < 0.001) with increasing inclusion of WSHL barley. Increasing levels of WSHL barley (P < 0.001) and supplemental enzyme (P < 0.01) increased gain to feed ratio.

3. Birds fed diets with 0 g/kg WSHL barley showed the lowest (P < 0.001 to 0.01) digestibility for all nutrients except starch. Only starch digestibility was improved (P < 0.05) by enzyme supplementation. The nitrogen-corrected apparent metabolisable energy improved with increasing inclusion of WSHL barley (P < 0.001) and supplemental enzyme (P < 0.001). Increasing inclusion of WSHL barley increased the relative weight of gizzard (P < 0.001) and reduced jejunal digesta viscosity (P < 0.01). Supplemental enzyme (P < 0.001) reduced digesta viscosity.

4. All levels of WSHL barley inclusion improved digestibility of dry matter, nitrogen and fat, whilst energy utilisation improved at inclusions of 130 g/kg WSHL and above, probably due to lowered digesta viscosity and better development of the gizzard. Gain to feed ratio, starch digestibility, energy utilisation and jejunal digesta viscosity can benefit from carbohydrase supplementation in wheat-based diets, regardless of barley inclusion level.

1.进行了为期21天的实验，研究了无蜡淀粉壳（WSHL）大麦和多组分外源糖化酶分级夹杂物对肉鸡生长性能，养分消化率和肠道形态的影响。在5×2中评估了五种水平的WSHL大麦大麦包含量（0、65、130、195和260 g / kg）和两种水平的酶补充（0和150 g /吨饲料）。 10种饮食疗法的析因安排。所有饮食的代谢能和可消化氨基酸含量均相同。实验中总共使用了400只一岁大的雄性肉鸡（每笼五个笼子；每笼八只鸟笼）。

2.无论添加哪种酶，随着WSHL大麦含量的增加，采食量下降（P <0.001）。WSHL大麦（P <0.001）和补充酶（P <0.01）的水平增加，增加了饲料的采食率。

3.饲喂0 g / kg WSHL大麦的日粮对所有营养物质（淀粉除外）的消化率最低（P <0.001至0.01）。通过添加酶仅改善了淀粉的消化率（P <0.05）。氮校正的表观可代谢能量随着WSHL大麦（P <0.001）和补充酶（P <0.001）的添加增加而改善。WSHL大麦含量的增加增加了g的相对重量（P <0.001）并降低了空肠消化物的粘度（P <0.01）。补充酶（P <0.001）降低了消化液的粘度。

4.各种水平的WSHL大麦夹杂物均改善了干物质，氮和脂肪的消化率，而对于WSHL为130 g / kg或更高的夹杂物，能量利用率得到了改善，这可能是由于消化液粘度降低和izz的发育更好。无论小麦的添加量如何，在以小麦为基础的日粮中添加糖化酶都可以提高饲料的进料比，淀粉的消化率，能量利用和空肠消化的黏度。