Palander Samu, Näsi Matti, Järvinen Sari
Department of Animal Science, University of Helsinki, Finland.
Arch Anim Nutr. 2005 Jun;59(3):191-203. doi: 10.1080/17450390500148071.
The effects of age of growing turkeys and beta-glucanase-xylanase activity-containing feed enzyme supplementation on digestibility and feeding value of pelleted maize, wheat, barley and oats were investigated in growing turkeys using excreta collection and ileal sampling by slaughter. Excreta were collected and turkeys were slaughtered at 4, 8 and 12 weeks of age. Viscosity of jejuno-duodenal digesta, caecal volatile fatty acid concentration, ileal crude protein digestibility, total tract fat digestibility and AMEN were assayed using titanium dioxide as an indigestible marker. The highest viscosities were observed in barley and wheat. Viscosity of wheat, barley and oats digesta decreased while caecal volatile fatty acid concentration, fat digestibility and AMEN increased with age. Ileal crude protein digestibility was highest in wheat and lowest in barley. Ileal crude protein digestibility significantly declined with age in most feeding treatments. Enzyme reduced digesta viscosity most efficiently in wheat and barley and improved ileal crude protein digestibility, total tract fat digestibility and AMEN in wheat, barley and oats, but interactions occurred, the effect of enzyme on viscosity being the most remarkable for wheat and barley and for the young birds.
采用排泄物收集法和屠宰后回肠采样法，研究了生长阶段火鸡的年龄以及添加含β-葡聚糖酶-木聚糖酶活性的饲料酶对颗粒状玉米、小麦、大麦和燕麦消化率及饲喂价值的影响。在4周龄、8周龄和12周龄时收集排泄物并屠宰火鸡。以二氧化钛作为不可消化标记物，测定空肠-十二指肠食糜黏度、盲肠挥发性脂肪酸浓度、回肠粗蛋白消化率、全消化道脂肪消化率和表观代谢能。在大麦和小麦中观察到最高的黏度。随着年龄的增长，小麦、大麦和燕麦食糜的黏度降低，而盲肠挥发性脂肪酸浓度、脂肪消化率和表观代谢能增加。回肠粗蛋白消化率在小麦中最高，在大麦中最低。在大多数饲喂处理中，回肠粗蛋白消化率随年龄显著下降。酶在小麦和大麦中最有效地降低了食糜黏度，并提高了小麦、大麦和燕麦的回肠粗蛋白消化率、全消化道脂肪消化率和表观代谢能，但存在相互作用，酶对黏度的影响在小麦和大麦以及幼鸟中最为显著。
