ABSTRACT

1. The aim of this study was to examine the impact of dietary soluble non-starch polysaccharide (sNSP) level and composition on grower and finisher phase performance, total tract nutrient digestibility and excreta moisture content in broiler chickens.

2. Cobb 500 broilers (n = 1080) were fed 12 dietary treatments; four diets with differing primary grain sources (barley, corn, sorghum and wheat) and three different sNSP levels (low, medium and high). Diets were formulated to have similar protein and energy levels but differing sNSP levels, induced by manipulating the quantity of the ingredients in the diet. The diets were fed in three phases, starter (d 0–12), grower (d 12–23) and finisher (d 23–31).

3. For birds aged d 23 and 31, total pen body weight and feed intake were determined, and fresh excreta and litter samples were collected per pen. Dry matter (DM) content was measured in the excreta and litter samples. Total tract DM digestibility, apparent metabolisable energy corrected to nitrogen (AMEn), and soluble and insoluble NSP and free oligosaccharide degradability were evaluated.

4. In birds fed the sorghum- and corn-based diets, feeding high sNSP resulted in a lower cFCR at d 0–23 compared to low sNSP (P = 0.004 and P = 0.044, respectively). In birds fed the corn-based diet, feeding low sNSP resulted in the lowest litter DM but highest DM digestibility at d 23 (P = 0.045 and P < 0.001) and d 31 (P = 0.022 and P = 0.008). For all diets, degradability of sNSP was higher and insoluble NSP was lower when feeding low compared to high sNSP (P < 0.001). In birds fed the barley- and sorghum-based diets, AMEn was lower when feeding the low compared to high sNSP level (P < 0.001 and P = 0.016, respectively).

6. Results from this study showed that level of dietary sNSP impacts broiler productive performance and nutrient utilisation.

摘要

1. 本研究的目的是检查日粮可溶性非淀粉多糖 (sNSP) 水平和成分对肉鸡生长和育肥阶段性能、全道养分消化率和排泄物水分含量的影响。

2. Cobb 500 肉鸡（n  =  1080）饲喂 12 个日粮处理；四种具有不同主要谷物来源（大麦、玉米、高粱和小麦）和三种不同 sNSP 水平（低、中和高）的饮食。通过控制饮食中成分的数量，将饮食配制为具有相似的蛋白质和能量水平，但具有不同的 sNSP 水平。日粮分三个阶段饲喂：开食期（第 0-12 天）、生长期（第 12-23 天）和育肥期（第 23-31 天）。

3. 对于 23 岁和 31 岁的鸡，测定围栏总重和采食量，每围栏收集新鲜排泄物和垫料样品。测量排泄物和垫料样品中的干物质 (DM) 含量。对总消化道 DM 消化率、表观代谢能校正到氮 (AMEn) 以及可溶性和不溶性 NSP 和游离寡糖降解性进行了评估。

4. 在饲喂高粱和玉米日粮的家禽中，与低 sNSP 相比，饲喂高 sNSP 导致第 0-23 天的 cFCR 较低（分别为 P = 0.004 和 P = 0.044）。在饲喂以玉米为基础的日粮的鸡群中，饲喂低 sNSP 导致在第 23 天（P = 0.045 和 P < 0.001）和第 31 天（P = 0.022 和 P = 0.008）的产仔数最低但DM 消化率最高。对于所有饮食，与高 sNSP 相比，低 sNSP 的 sNSP 降解率更高，不溶性 NSP 更低（P < 0.001）。在饲喂以大麦和高粱为基础的日粮的家禽中，与高 sNSP 水平相比，饲喂低水平的 AMEn 较低（分别为 P < 0.001 和 P = 0.016）。

6. 本研究的结果表明，日粮 sNSP 水平会影响肉鸡的生产性能和营养利用。