本研究在饲粮中分别添加3个不同剂量的玉米源异麦芽寡糖菌质粉(IBS),旨在研究其对黄羽肉鸡生长性能和内源性激素分泌的影响。选择1日龄黄羽肉鸡270只,公母各占1/2,随机分成5组。对照1组饲喂基础饲粮,对照2组在基础饲粮中添加4.27 g/kg市售食品级低聚异麦芽寡糖粉,试验1、2、3组分别在基础饲粮中添加6、12、24 g/kg IBS。结果表明:1)与对照1组相比,试验1、2、3组死亡率分别降低33.30%、49.95%、49.95%;1~52日龄,试验1、2、3组平均日增重分别提高8.80%(P<0.01)、11.02%(P<0.01)、7.80%(P<0.01);试验1、2、3组料重比分别降低8.73%(P<0.05)、9.09%(P<0.01)、6.91%(P<0.05);试验2组血清中甲状腺素含量提高8.68%(P<0.05);试验3组血清中胰高血糖素含量降低24.75%(P<0.05);在血清胰岛素动态变化过程中,采食后1 h,试验1组提高40.31%(P<0.05),采食后2 h,试验2组提高40.09%(P<0.05);在血清生长激素动态变化过程中,采食后1 h,试验3组提高35.18%(P<0.05),采食后2 h,试验2、3组分别提高48.26%(P<0.05)、42.72%(P<0.05);试验2、3组血清中生长激素含量总体平均值分别提高23.65%(P<0.05)、26.29%(P<0.05)。2)与对照2组相比,试验2、3组死亡率均降低24.97%;1~52日龄,试验1、2、3组平均日增重分别提高6.57%(P<0.05)、8.75%(P<0.01)、5.59%(P<0.05);在血清胰岛素动态变化过程中,采食后2 h,试验2组提高44.55%(P<0.05);在血清生长激素动态变化过程中,采食后2 h,试验2、3组分别提高50.24%(P<0.05)、44.63%(P<0.05);试验3组血清中生长激素含量总体平均值提高23.80%(P<0.05)。结果提示,黄羽肉鸡饲粮中添加一定剂量的IBS,对其生长性能、激素分泌有促进作用,且在本试验的3个剂量中,以添加12 g/kg IBS综合效果最佳。

In order to study the effects of activity flour of isomalto-oligosaccharides bacterium substance from corn (IBS) with three doses on growth performance and hormone secretion of yellow-feathered broilers, a total of 270 one-day-old yellow-feathered broilers were allocated to 5 groups, including control groups 1, 2 and experimental groups 1, 2, 3. The control group 1 was fed basal diets, control group 2 was fed basal diets added with 4.27 g/kg food-grade isomalto-oligosaccharides, and experimental groups were fed basal diets added with 6, 12, 24 g/kg IBS, respectively. The results showed as follows: 1) compared with control group 1, the mortality in experimental groups 1, 2, 3 was decreased by 33.30%,49.95%,49.95%; at 1 to 52 days of age, the average daily gain in experimental groups 1, 2, 3 was increased by 8.80% (P<0.01), 11.02% (P<0.01), 7.80% (P<0.01), and the feed/gain in experimental groups 1, 2, 3 was decreased by 8.73%(P<0.05), 9.09%(P<0.01), 6.91%(P<0.05); serum T₄ content in experimental group 2 was increased by 2.88% (P<0.05); serum Glu content in experimental group 3 was decreased by 24.75% (P<0.05); in the process of dynamic changes, serum Ins content in experimental group 1 was increased by 40.31% (P<0.05) at 1 h after feeding, and that in experimental group 2 was increased by 40.09% (P<0.05) at 2 h after feeding; in the process of dynamic changes, serum GH content in experimental group 3 was increased by 5.18% (P<0.05) at 1 h after feeding, that in experimental groups 2, 3 was increased by 48.26% (P<0.05), 42.72% (P<0.05) at 2 h after feeding, and overall average of that in experimental groups 2, 3 was increased by 23.65% (P<0.05), 26.29% (P<0.05). 2) Compared with control group 2, the mortality in experimental groups 2, 3 was decreased by 24.97%, 24.97%; the average daily gain of broilers at 1 to 52 days of age in experimental groups 1, 2, 3 was increased by 6.57%(P<0.05), 8.75%(P<0.01), 5.59%(P<0.05); in the process of dynamic changes, serum Ins content in experimental group 2 was increased by 44.55% (P<0.05) at 2 h after feeding; in the process of dynamic changes, serum GH content in experimental groups 2, 3 was increased by 50.24% (P<0.05), 44.63% (P<0.05) at 2 h after feeding, and overall average of that in experimental group 3 was increased by 23.80% (P<0.05). In conclusion, there is a positive effect on growth performance and hormone secretion of yellow-feathered broilers by supplemented with IBS in diets, and the effect of feeding basal diet added with 12 g/kg IBS is the best among three doses in this trial.