Betsha Simret, Melaku Solomon
Hawassa University, PO Box 5, Hawassa, Ethiopia.
Trop Anim Health Prod. 2009 Aug;41(6):927-33. doi: 10.1007/s11250-008-9281-8. Epub 2008 Dec 4.
A digestibility and nitrogen (N) balance experiment was conducted using twenty yearling male Somali goats weighing 23.4 +/- 2.02 (mean+/-SD). The objectives of the study were to evaluate the effects of supplementation with graded levels of mixture of groundnut cake and wheat bran at a ratio of 3:1 on DM basis on feed intake, apparent digestibility and N balance in Somali goats. The experimental design was a completely randomized design consisting of five animals in each treatment. The dietary treatments included ad libitum feeding of hay (T1, control), and daily supplementation with 200 (T2, low) 300 (T3, medium) and 400 g DM (T4, high) of the concentrate mix. Increased level of supplementation reduced (P < 0.001) daily hay DM intake. Digestibility of crude protein (CP) was higher (P < 0.001) for the supplemented goats. Urinary nitrogen, total nitrogen excretion and retention increased (P < 0.01) with the level of supplementation. It was concluded that supplementation with groundnut -wheat bran mixture promoted feed intake and digestibility of DM, CP, and N retention in Somali goats fed hay. However, supplementation at the medium level appeared to be more effective since it promoted similar N balance with the high level of supplementation.
使用20只体重为23.4±2.02（均值±标准差）的一岁雄性索马里山羊进行了一项消化率和氮（N）平衡实验。本研究的目的是评估以干物质为基础，按3:1比例添加不同水平花生饼和麦麸混合物对索马里山羊采食量、表观消化率和氮平衡的影响。实验设计为完全随机设计，每个处理组有5只动物。日粮处理包括自由采食干草（T1，对照组），以及每日分别补充200（T2，低水平）、300（T3，中等水平）和400克干物质（T4，高水平）的精料混合料。补充水平的提高降低了（P<0.001）每日干草干物质采食量。补充组山羊的粗蛋白（CP）消化率更高（P<0.001）。尿氮、总氮排泄量和氮潴留量随补充水平的增加而增加（P<0.01）。得出的结论是，补充花生-麦麸混合物可促进采食干草的索马里山羊的采食量、干物质消化率、粗蛋白消化率和氮潴留。然而，中等水平的补充似乎更有效，因为它与高水平补充促进了相似的氮平衡。
