Kim Eunjoo, Morgan Natalie K, Moss Amy F, Li Lily, Ader Peter, Choct Mingan
School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.
BASF South East Asia, 038987, Singapore.
Anim Nutr. 2021 Dec 14;9:138-142. doi: 10.1016/j.aninu.2021.11.004. eCollection 2022 Jun.
The present study characterised the types and amounts of non-starch polysaccharides (NSP) remaining undigested along the gastrointestinal tract (GIT) of broiler chickens offered a typical wheat- or maize-based diet. One-day old Cobb 500 mixed-sex chicks were assigned to 24 pens, with 10 birds/pen and 12 pens/treatment. Birds were offered the experimental diets in 3 phases (starter, day 0 to 10; grower, day 11 to 24 and finisher, day 25 to 35). Excreta and digesta samples from the crop, gizzard, duodenum, jejunum, ileum and caeca were collected at 12 and 35 days of age, and analysed for the NSP flow. The wheat-based diet contained higher levels of soluble NSP than the maize-based diet, whereas insoluble NSP levels were similar between the 2 diets. Detailed analysis of NSP constituents revealed that arabinoxylans were the primary NSP in the wheat-based diet, mostly in insoluble form. Pectins were the predominant NSP in the maize-based diet, followed by arabinoxylans. Overall, birds offered the wheat-based diet presented higher levels of soluble NSP remaining in all gut sections compared to birds offered the maize-based diet, at both 12 and 35 days of age ( < 0.050). Accumulation of insoluble NSP in the gizzard was noted in birds fed both diets, but was more pronounced in birds offered the maize-based diet compared to the wheat-based diet, at both 12 and 35 days of age ( < 0.001). The present study highlights marked differences in the amounts and types of NSP delivered to the different gut sections when feeding wheat-compared to maize-based diets, particularly in the gizzard and the lower GIT of birds.
本研究对以典型小麦或玉米为基础日粮的肉鸡胃肠道（GIT）中未消化的非淀粉多糖（NSP）的类型和数量进行了表征。1日龄的科宝500混合性别雏鸡被分配到24个鸡笼中，每笼10只鸡，每种处理12个鸡笼。鸡分三个阶段饲喂实验日粮（开食期，第0至10天；生长期，第11至24天；育肥期，第25至35天）。在12日龄和35日龄时收集嗉囊、砂囊、十二指肠、空肠、回肠和盲肠的排泄物和消化物样本，并分析NSP流量。以小麦为基础的日粮中可溶性NSP含量高于以玉米为基础的日粮，而两种日粮中不溶性NSP含量相似。对NSP成分的详细分析表明，阿拉伯木聚糖是以小麦为基础日粮中的主要NSP，大多为不溶性形式。果胶是以玉米为基础日粮中的主要NSP，其次是阿拉伯木聚糖。总体而言，在12日龄和35日龄时，与饲喂以玉米为基础日粮的鸡相比，饲喂以小麦为基础日粮的鸡在所有肠道段中剩余的可溶性NSP水平更高（P<0.050）。两种日粮喂养的鸡都出现了砂囊中不溶性NSP的积累，但在12日龄和35日龄时，与以小麦为基础的日粮相比，以玉米为基础日粮喂养的鸡中这种积累更为明显（P<0.001）。本研究突出了饲喂小麦和玉米基础日粮时，输送到不同肠道段的NSP的数量和类型存在显著差异，特别是在鸡的砂囊和下消化道。
