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首页> 外文期刊>British Poultry Science >The effect of graded inclusions of waxy starch hull-less barley and a multi-component exogenous carbohydrase on the growth performance, nutrient digestibility and intestinal morphometry of broiler chickens
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The effect of graded inclusions of waxy starch hull-less barley and a multi-component exogenous carbohydrase on the growth performance, nutrient digestibility and intestinal morphometry of broiler chickens

机译：蜡状淀粉船体大麦和多组分外源碳水化酶对肉鸡生长性能，营养消化率和肠形态学的影响

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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 x 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.
机译：1.进行了21-D实验，探讨了蜡状淀粉壳（WSHL）大麦和多组分外源碳水化酶对肉鸡鸡的生长性能，营养消化率和肠形态的影响。在5×2中评估了小麦饮食中的五个水平的WSHL大麦包含（0,65,130,195和260g / kg），以及两种水平的酶补充剂（0和150克/吨），在5×2中评价10个饮食治疗的阶乘安排。所有饮食中的所有饮食相当于代谢能量和可消化氨基酸含量。共有400人，一岁的雄性肉鸡（五个笼子/治疗;八只鸟/笼子）被实验。 2.无论酶补充剂如何，饲料摄入量下降（P <0.001）随着WSHL大麦的增加而下降（P <0.001）。增加WSHL大麦的水平（P <0.001）和补充酶（P <0.01）增加进料比率。 3.鸟类喂食0g / kg wshl大麦的饮食显示除淀粉外的所有营养素的最低（p <0.001至0.01）的消化率。通过酶补充，仅改善了淀粉消化率（P <0.05）。随着WSHL大麦的含量增加（P <0.001）和补充酶（P <0.001），氮校正表观代谢能量提高了（P <0.001）。增加了WSHL大麦的含量增加了Gizzard的相对重量（P <0.001）并降低了Jejunal Digesta粘度（P <0.01）。补充酶（P <0.001）减少粘度。 4.所有级别的WSHL大麦含有含量改善干物质，氮气和脂肪的消化率，而能源利用率在130克/千克WSHL及以上的夹杂物中改善，可能是由于降低的消化不良粘度和更好的Gizzard发展。提高饲料比率，淀粉消化率，能量利用和JEUNAL Digesta粘度可以从小麦饮食中的碳水化合物补充剂中受益，无论大麦包装均匀。

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