摘要
Concentrated separator by-product (CSB) is produced when beet molasses goes through an industrial desugaring process. To investigate the nutritional value of CSB as a supplement for grass hay diets (12.5% CP; DM basis), 4 ruminally and duodenally cannulated beef steers (332 ± 2.3 kg) were used in a 4 × 4 Latin square with a 2 × 2 factorial arrangement of treatments. Factors were intake level: ad libitum (AL) vs. restricted (RE; 1.25% of BW, DM basis) and dietary CSB addition (0 vs. 10%; DM basis). Experimental periods were 21 d in length, with the last 7 d used for collections. By design, intakes of both DM and OM (g/kg of BW) were greater (P < 0.01; 18.8 vs. 13.1 ± 0.69 and 16.8 vs. 11.7 ± 0.62, respectively) for animals consuming AL compared with RE diets. Main effect means for intake were not affected by CSB (P = 0.59). However, within AL-fed steers, CSB tended (P = 0.12) to improve DMI (6,018 vs. 6,585 ± 185 g for 0 and 10% CSB, respectively). Feeding CSB resulted in similar total tract DM and OM digestion compared with controls (P = 0.50 and 0.87, respectively). There were no effects of CSB on apparent total tract NDF (P = 0.27) or ADF (P = 0.35) digestion; however, apparent N absorption increased (P = 0.10) with CSB addition. Total tract NDF, ADF, or N digestion coefficients were not different between AL- and RE-fed steers. Nitrogen intake (P = 0.02), total duodenal N flow (P = 0.02), and feed N escaping to the small intestine (P = 0.02) were increased with CSB addition. Microbial efficiency was unaffected by treatment (P = 0.17). Supplementation with CSB increased the rate of DM disappearance (P = 0.001; 4.9 vs. 6.9 ± 0.33 %/h). Restricted intake increased the rate of in situ DM disappearance (P = 0.03; 6.4 vs. 5.3 ± 0.33 %/h) compared with AL-fed steers. Ruminal DM fill was greater (P = 0.01) in AL compared with RE. Total VFA concentrations were greater (P = 0.04) for CSB compared with controls; however, ammonia concentrations were reduced (P = 0.03) with CSB addition. At different levels of dietary intake, supplementing medium-quality forage with 10% CSB increased N intake, small intestinal protein supply, and total ruminal VFA.
摘要译文
当甜菜糖浆经历工业脱糖过程时，生产浓缩的分离副产物（CSB）。为了研究CSB作为草料干草饲料的补充（12.5％CP; DM基准）的营养价值，4个阉牛肉和十二指肠牛肉阉牛（332±2。3公斤）被用于4×4拉丁方格与2×2因子排列的治疗。因素是摄入量水平：随意（AL）与限制（RE;体重1.25％DM基础）和膳食CSB添加（0对10％; DM基础）。试验期为21天，最后7天用于收集。按照设计，与RE日粮相比，服用AL的动物的DM和OM摄入量（g / kg体重）较大（分别为P 0.01; 18.8对13.1±0.69和16.8对11.7±0.62）。主要影响手段的摄入量不受CSB影响（P \x3d 0.59）。然而，在AL喂养的阉牛中，CSB趋向于（P \x3d 0.12）以改善DMI（分别为6,018和6,585±185g，分别为0和10％CSB）。与对照相比，饲喂CSB导致类似的总道DM和OM消化（分别为P \x3d 0.50和0.87）。 CSB对表观总道NDF没有影响（P \x3d 0。27）或ADF（P \x3d 0.35）消化;然而，随着CSB添加，表观N吸收量增加（P \x3d 0.10）。总道NDF，ADF，或N消化系数在AL和RE喂养的阉牛之间没有差异。氮摄入量（P \x3d 0.02），十二指肠总N流量（P \x3d 0.02）和向小肠排泄的饲料氮（P \x3d02）随着CSB的增加而增加。微生物效率不受治疗影响（P \x3d 0.17）。补充CSB可增加DM消失率（P \x3d 0.001; 4.9 vs. 6.9±0.33％/ h）。与AL喂养的阉牛相比，限制摄入增加了原位DM消失率（P \x3d 0.03; 6.4对5.3±0.33％/ h）。与RE相比，AL中的瘤胃DM填充更大（P \x3d 0.01）。与对照相比，CSB的总VFA浓度更高（P \x3d 0.04）;然而，CSB添加后氨浓度降低（P \x3d 0.03）。在不同的饮食摄入水平下，补充10％CSB的中等质量牧草增加氮摄入量，小肠蛋白质供应和总瘤胃VFA。
S. M. Shellito;M. A. Ward;G. P. Lardy;M. L. Bauer;J. S. Caton. Effects of concentrated separator by-product (desugared molasses) on intake, ruminal fermentation, digestion, and microbial efficiency in beef steers fed grass hay[J]. Journal of Animal Science, 2006,84(6): 1535–1543