The effects of corn particle size and dietary fibre on the performance, coefficient of apparent ileal digestibility (CAID) and intestinal characteristics in broiler starters fed pelleted diets were studied. The experiment included 10 treatments arranged as a 2 Ã— 5 factorial with two corn particle sizes (GMD of 1071 [CGC] vs. 534 [FGC]) and five diets that consisted in a low-fibre diet and four extra diets resulting from the inclusion of insoluble fibre sources (10 g/kg of lignocellulose (LC), and 30 g/kg of oat hulls; OH, rice hulls; RH, and sunflower hulls; SFH). In coarse grinding, all-fibre sources improved body weight gain and feed intake compared to the control diet (p < 0.01). Feed conversion ratio (FCR) improved with fibre supplementation (p < 0.01) and fine grinding of corn (FGC) (p < 0.01). Coarse grinding of corn (CGC) and inclusion of RH, SFH and OH reduced gizzard pH (p < 0.01). Fibre inclusion increased ileal fat and Ca digestibility (p < 0.01), gizzard weight (p < 0.01), digesta transit time (p < 0.01) and length of duodenum and small intestine (p < 0.01). The CAID of phosphorus increased in CGC fed birds and inclusion of RH, SFH and OH (p < 0.05). The weight of gizzard, proventriculus and pancreas (p < 0.01) was greater in CGC fed birds. Feeding SFH, RH and OH (p < 0.01), and CGC (p < 0.01) increased the villus height (VH) of the duodenum. The OH, RH and SFH supplementation increased the caecal population of Lactobacillus spp. and total anaerobic bacteria (p < 0.01) only in FGC fed birds. Overall, birds fed pelleted diets containing RH, OH and SFH (3%) exhibited improved performance, and increased nutrient digestibility, which may be caused by developed gizzards and intestine. Furthermore, coarse grinding of corn is beneficial to gizzard development.

中文翻译：

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玉米颗粒大小和不溶性纤维来源对饲喂颗粒饲料的肉鸡性能、营养利用和肠道形态的交互作用

研究了玉米粒度和膳食纤维对饲喂颗粒饲料的肉鸡开胃菜的性能、回肠表观消化率 (CAID) 系数和肠道特性的影响。该实验包括以 2 × 5 因子排列的 10 种处理，具有两种玉米粒度（GMD 为 1071 [CGC] 与 534 [FGC]）和五种饮食，其中包括低纤维饮食和四种额外饮食。包含不溶性纤维来源（10 g/kg 木质纤维素 (LC) 和 30 g/kg 燕麦壳；OH，稻壳；RH 和向日葵壳；SFH）。在粗磨中，与对照饮食相比，全纤维来源改善了体重增加和采食量（p  < 0.01）。添加纤维后饲料转化率 (FCR) 提高 ( p < 0.01) 和细磨玉米 (FGC) ( p  < 0.01)。玉米 (CGC) 的粗磨和 RH、SFH 和 OH 的加入降低了砂囊的 pH 值 ( p  < 0.01)。纤维内含物增加了回肠脂肪和钙的消化率 ( p  < 0.01)、胗重 ( p  < 0.01)、食糜通过时间 ( p  < 0.01) 以及十二指肠和小肠的长度 ( p  < 0.01)。在 CGC 喂养的鸟类中磷的 CAID 增加，并且包含 RH、SFH 和 OH ( p  < 0.05)。 饲喂 CGC 的鸡的胼胝、胃胃和胰腺的重量 ( p < 0.01) 更大。喂养 SFH、RH 和 OH ( p  < 0.01)，以及 CGC ( p < 0.01) 增加了十二指肠的绒毛高度 (VH)。OH、RH 和 SFH 的补充增加了盲肠中乳酸杆菌的数量。和总厌氧菌( p  < 0.01) 仅在 FGC 喂养的鸟类中。总体而言，饲喂含有 RH、OH 和 SFH (3%) 的颗粒饲料的鸡表现出改善的性能，并增加了营养物质的消化率，这可能是由发育的胼和肠引起的。此外，玉米的粗磨有利于胼胝的发育。