Irish G G, Barbour G W, Classen H L, Tyler R T, Bedford M R
Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada.
Poult Sci. 1995 Sep;74(9):1484-94. doi: 10.3382/ps.0741484.
Two studies using broiler chicks and one using adult White Leghorn roosters were conducted to determine the influence of stachyose and raffinose (alpha-galactosides of sucrose) present in soybean meal (SBM) on the nutritional value of the meal. In Experiment 1, the addition of four levels (0, .05, .10, or .20 g/kg) of alpha-galactosidase with and without 1 g/kg of invertase to a corn-SBM diet had no effect on weight gain, feed efficiency, protein digestibility, or the digestible energy value of the feed when fed to broiler chicks. However, both enzymes decreased (P < .001) dietary AMEn. In Experiment 2, ethanol extraction and incubation of SBM with alpha-galactosidase decreased the concentrations of the alpha-galactosides of sucrose in SBM from 6.59 to .81 and 1.43%, respectively. However, when broiler chicks were fed semi-purified diets containing SBM, ethanol-extracted SBM, water-incubated SBM, or water plus alpha-galactosidase-incubated SBM, no improvements in weight gain, feed efficiency, or apparent protein digestibility were observed. There was also no improvement in TMEn when the above meals were precision fed to adult White Leghorn roosters (Experiment 3). These results indicate that the removal of up to approximately 90% of the alpha-galactosides of sucrose has no beneficial effect on the nutritional value of SBM for chickens.
开展了两项以肉鸡雏鸡为对象的研究以及一项以成年白来航公鸡为对象的研究，以确定豆粕（SBM）中存在的水苏糖和棉子糖（蔗糖的α-半乳糖苷）对该饲料营养价值的影响。在实验1中，在玉米-豆粕日粮中添加四个水平（0、0.05、0.10或0.20 g/kg）的α-半乳糖苷酶，添加或不添加1 g/kg的转化酶，饲喂肉鸡雏鸡时，对体重增加、饲料效率、蛋白质消化率或饲料的可消化能量值均无影响。然而，两种酶均降低了（P < 0.001）日粮的表观代谢能（AMEn）。在实验2中，用乙醇提取并将豆粕与α-半乳糖苷酶一起孵育，使豆粕中蔗糖α-半乳糖苷的浓度分别从6.59%降至0.81%和1.43%。然而，当给肉鸡雏鸡饲喂含有豆粕、乙醇提取的豆粕、水孵育的豆粕或水加α-半乳糖苷酶孵育的豆粕的半纯化日粮时，未观察到体重增加、饲料效率或表观蛋白质消化率有改善。当将上述饲料精确饲喂成年白来航公鸡时（实验3），真代谢能（TMEn）也没有提高。这些结果表明，去除高达约90%的蔗糖α-半乳糖苷对豆粕对鸡的营养价值没有有益影响。
