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首页> 美国卫生研究院文献>Poultry Science >Effect of feeding different levels of lignocellulose on performance nutrient digestibility excreta dry matter and intestinal microbiota in slow growing broilers
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Effect of feeding different levels of lignocellulose on performance nutrient digestibility excreta dry matter and intestinal microbiota in slow growing broilers

机译：不同水平的木质纤维素对慢速生长肉鸡肠道纤维素营养消化率排泄物干物质和肠道微生物的影响

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Lignocellulose is a constituent of plant cell walls and might be used as a fiber source in poultry nutrition. The current study investigated the impact of increasing dietary levels of lignocellulose on performance, nutrient digestibility, excreta DM, intestinal microbiota, and bacterial metabolites in slow growing broilers. At an age of 10 wk, 60 male broilers of an intercross line (New Hampshire × White Leghorn) were allocated to cages and fed isoenergetic and isonitrogenous diets containing 0.8% (LC1), 5% (LC2), or 10% (LC3) lignocellulose. After 23 D of feeding, broilers were killed and digesta samples of ileum and excreta analyzed for nutrient digestibility and DM. Cecal contents were analyzed for microbial composition and metabolites. Broiler performance was not affected by feeding dietary lignocellulose. LC3 fed broilers showed reduced ileal digestibility of protein compared to chickens fed LC1 (P = 0.003). Moreover, increasing levels of dietary lignocellulose reduced apparent digestibility of organic matter and gross energy (P < 0.001). Feeding of lignocellulose had no impact on the excreta DM of broilers. Increasing levels of dietary lignocellulose lowered cecal counts of Escherichia/Hafnia/Shigella (P = 0.029) and reduced the total concentration of short-chain fatty acids (P < 0.001), lactate (P < 0.05), and ammonia (P = 0.009). The molar ratio of cecal acetic acid was higher in LC3 fed broilers (P < 0.001), while the proportions of cecal propionic acid and n-butyric acid were higher in LC1 and LC2 fed chickens (P < 0.001). Correlation analyses indicated that dietary lignocellulose was negatively related to the total concentration of cecal bacterial metabolites (P < 0.001). In conclusion, the feeding of lignocellulose did not affect growth performance, but impaired nutrient digestibility of slow growing broilers. While minor changes in cecal microbial composition were detected, cecal bacterial metabolite concentrations were significantly reduced with increasing levels of dietary lignocellulose. These findings suggest that lignocellulose is not extensively degraded by bacteria residing in the large intestine of broilers.
机译：木质纤维素是植物细胞壁的组成，并且可以用作家禽营养中的纤维源。目前的研究调查了增加木质纤维素饮食水平对缓慢生长肉鸡的性能，营养消化能力，EXCRETA DM，肠道微生物和细菌代谢物的影响。在10周的年龄，60个的相互交叉线（新罕布什尔州×白来亨鸡）的雄性肉仔鸡分配给笼中，并饲喂含0.8％（LC1），5％（LC2），或10％（LC3）等能和等氮的饮食木质纤维素。在23 d喂养后，肉鸡被杀死，回肠和Excreata的Digesta样品分析营养消化率和DM。分析杂交内容物用于微生物组合物和代谢物。肉鸡的性能不受喂养膳食木质纤维素的影响。与鸡FED LC1相比，LC3喂油肉鸡蛋白质的蛋白质消化率降低（P = 0.003）。此外，增加膳食木质纤维素水平降低了有机物质和总能量的表观消化率（P <0.001）。木质纤维素的喂养对肉鸡的Excreta DM没有影响。增加膳食木质纤维素水平降低了大肠杆菌/铪/志贺氏菌（P = 0.029）并降低了短链脂肪酸的总浓度（P <0.001），乳酸（P <0.05）和氨（P = 0.009） 。 LC3喂油剂中螯合乙酸的摩尔比较高（P <0.001），而LC1和LC2鸡的螯合丙酸和正丁酸的比例较高（P <0.001）。相关分析表明，膳食木质纤维素与肠细菌代谢物的总浓度负相关（P <0.001）。总之，木质纤维素的饲养不影响生长性能，但缓慢生长肉鸡的营养消化率受损。虽然检测到肠道微生物组合物的微小变化，但随着膳食木质纤维素水平的增加，肠细菌代谢物浓度显着降低。这些发现表明木质纤维素不会被驻留在肉鸡的大肠中的细菌过度降解。

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