The objective of this study was to investigate the effects of particle size and xylanase supplementation in corn-based pellet diets on the performance and digestive traits in young broilers. A total of 512 male Ross 308 broilers were used in a 21-day study. The treatments were designed in a 4 × 2 factorial arrangement with four levels of geometric mean diameter (D_gw) of corn (540, 660, 1390, and 1700 µm), and two levels of xylanase (0 or 16,000 BXU/kg diet). Feeding coarse corn diets (1390 and 1700 µm D_gw) and xylanase supplementation showed an inferior coefficient of variation of body weight. Higher gizzard weight, microbiome alpha-diversity, and clustered separately beta-diversity (p < 0.05) were observed in birds fed coarse diets. The addition of xylanase promoted changes in relative bacteria abundance, increasing Lachnospiraceae, Defluviitaleaceae, Bacteroidaceae, Bacillaceae, Eggerthellaceae, and Streptococcaceae families in the 1700 µm group, and Christensenellaceae and Lachnospiraceae families in the 540 µm D_gw group. In conclusion, xylanase supplementation and particle size of corn interact in the intestinal environment, showing changes in microbial composition. Coarse diets and xylanase supplementation showed improved body weight homogeneity, which might be related to a better gut development and microbiota modulation.

中文翻译：

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玉米-大豆颗粒日粮中粒度和木聚糖酶对雏鸡生产性能，营养利用，微生物群和短链脂肪酸产生的影响

这项研究的目的是研究玉米基颗粒饲料中添加颗粒大小和木聚糖酶对雏鸡生产性能和消化性状的影响。在为期21天的研究中，总共使用了512头雄性Ross 308肉鸡。处理方式设计为4×2阶乘布置，具有四个水平的玉米几何平均直径（D _gw）（540、660、1390和1700 µm），以及两个水平的木聚糖酶（0或16,000 BXU / kg日粮） 。饲喂粗玉米日粮（1390和1700 µm D _gw）和补充木聚糖酶显示出较差的体重变异系数。izz的重量更高，微生物组的α多样性更高，并且分别聚集了β多样性（p在饲喂粗饲料的禽类中观察到<0.05）。木聚糖酶的添加促进了相对细菌丰度的变化，在1700 µm组中增加了漆酶科，去氟杆菌科，细菌科，芽孢杆菌科，茄科和链球菌科，而在540 µm D _gw组则增加了Christensenellaceae和漆科。总之，木聚糖酶的补充和玉米颗粒大小在肠道环境中相互作用，显示微生物组成的变化。粗粮和木聚糖酶的添加显示出改善的体重均匀性，这可能与更好的肠道发育和微生物群调节有关。