Chester-Jones H, Stern M D, Metwally H M, Linn J G, Ziegler D M
University of Minnesota, Southern Experiment Station, Waseca 56093.
J Anim Sci. 1991 Dec;69(12):4956-66. doi: 10.2527/1991.69124956x.
In vivo and in vitro 3 x 2 factorial experiments were conducted concurrently to evaluate the incorporation of 0, 15, or 30% sugar beet pulp (SBP) as an energy source in diets fed to growing Holstein steers with either soybean meal (SBM) or alcohol-treated, defatted soybean flakes (ATSBF) as primary supplemental protein sources. Three groups of 42 Holstein steers each were fed six different diets from 54 kg initial BW to 320 kg in three experimental periods. There were no overall SBP level x protein source interactions (P greater than .05). Beet pulp level tended to decrease ADG (linear, P = .05) and increase feed/gain (linear, P less than .05) and DMI (quadratic, P less than .05). Each grower diet was used in a substrate for ruminal microbial metabolism in six dual-flow, continuous-culture fermenters. Organic matter and carbohydrate digestion were similar (P greater than .05) among diets. Increasing dietary levels of SBP caused a concomitant increase (P less than .05) in acetate and decrease (P less than .05) in butyrate and isobutyrate concentrations. Beet pulp level x protein source interactions (P less than .05) were observed for CP degradation, ammonia and nonammonia N, and dietary N flow. Crude protein degradation was higher (P less than .05) for the 0% SBP with SBM diet (81.3%) than for the 30% SBP with ATSBF diet (64.4%). Efficiency of bacterial synthesis was similar (P greater than .05) among diets. Results indicated that SBP is an effective dietary energy source for high-energy grower diets at 15 or 30% of the DM but may cause a decrease in some performance traits. There were no nutritional benefits of using ATSBF vs SBM as the supplemental N source.
同时进行了体内和体外3×2析因试验，以评估在以豆粕（SBM）或酒精处理的脱脂大豆片（ATSBF）作为主要补充蛋白质来源的日粮中，添加0%、15%或30%的甜菜粕（SBP）作为能量来源对生长中的荷斯坦阉牛的影响。三组，每组42头荷斯坦阉牛，在三个试验阶段从初始体重54千克饲养至320千克，分别饲喂六种不同日粮。甜菜粕水平与蛋白质来源之间不存在总体交互作用（P>0.05）。甜菜粕水平有降低平均日增重的趋势（线性，P=0.05），并增加料重比（线性，P<0.05）和干物质采食量（二次曲线，P<0.05）。每种生长育肥牛日粮都被用作六个双外流连续培养发酵罐中瘤胃微生物代谢的底物。各日粮间有机物和碳水化合物消化率相似（P>0.05）。日粮中甜菜粕水平的增加导致乙酸盐浓度随之增加（P<0.05），丁酸盐和异丁酸盐浓度降低（P<0.05）。在粗蛋白降解、氨和非氨氮以及日粮氮流量方面，观察到甜菜粕水平与蛋白质来源之间存在交互作用（P<0.05）。0%甜菜粕与豆粕日粮的粗蛋白降解率（81.3%）高于30%甜菜粕与酒精处理的脱脂大豆片日粮（64.4%）（P<0.05）。各日粮间细菌合成效率相似（P>0.05）。结果表明，在干物质的15%或30%时，甜菜粕是高能生长育肥牛日粮的有效能量来源，但可能会导致一些生产性能指标下降。使用酒精处理的脱脂大豆片与豆粕作为补充氮源，在营养方面没有差异。
