Zinn R A
Department of Animal Science, University of California, El Centro 92243.
J Anim Sci. 1993 Jan;71(1):3-10. doi: 10.2527/1993.7113.
Ninety-six crossbred steers were used in a 172-d feedlot growth performance trial to determine the effects of type processing on the comparative feeding value of barley in a 90% concentrate finishing diet. Treatments were: 1) steam-flaked corn (SFC; density = .31 kg/L); 2) dry-rolled barley (DRB; density = .39 kg/L); 3) steam-rolled barley, coarse roll (SRB-C, density = .39 kg/L); and 4) SRB, thin roll (SRB-T, density = .19 kg/L). The ADG was similar (P > .10) across barley treatments, averaging 1.29 kg/d. Feed intake (P < .05) was lower for SRB than for DRB. Diet NE was greater (P < .05) for SRB than for DRB. Feed intake was lower (P < .05) for SFC than for barley diets. The influence of grain processing on characteristics of digestion was evaluated using four Holstein steers (average BW = 230 kg) with cannulas in the rumen and proximal duodenum. Ruminal and total tract digestibility of OM and starch were lower (P < .05) for DRB than for SRB. Ruminal and total tract digestibility of OM and starch were similar (P > .10) for SRB-C and SRB-T. However, passage of nonammonia N was markedly increased (26.9%, P < .01) with SRB-T compared with SRB-C. This increase in ruminal N efficiency was due partly to reduced ruminal degradation of feed N (23.4%, P < .01) and partly to increased microbial N synthesis (13.3%, P > .10). The comparative feeding value of DRB, SRB-C, and SRB-T in this study was 90, 92, and 96% the value of SFC, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)
96头杂交阉牛被用于一项为期172天的饲养场生长性能试验，以确定加工类型对90%精料育肥日粮中大麦比较饲喂价值的影响。处理方式有：1）蒸汽压片玉米（SFC；密度 = 0.31千克/升）；2）干碾压大麦（DRB；密度 = 0.39千克/升）；3）蒸汽碾压大麦，粗辊（SRB-C，密度 = 0.39千克/升）；4）蒸汽碾压大麦，细辊（SRB-T，密度 = 0.19千克/升）。各大麦处理组的平均日增重相似（P > 0.10），平均为1.29千克/天。SRB组的采食量低于DRB组（P < 0.05）。SRB组日粮的净能高于DRB组（P < 0.05）。SFC组的采食量低于大麦日粮组（P < 0.05）。使用4头装有瘤胃和十二指肠近端插管的荷斯坦阉牛（平均体重 = 230千克）评估谷物加工对消化特性的影响。DRB组的瘤胃和全消化道有机物及淀粉消化率低于SRB组（P < 0.05）。SRB-C组和SRB-T组的瘤胃和全消化道有机物及淀粉消化率相似（P > 0.10）。然而，与SRB-C组相比，SRB-T组非氨态氮的通过率显著提高（26.9%，P < 0.01）。瘤胃氮效率的提高部分归因于饲料氮瘤胃降解率降低（23.4%，P < 0.01），部分归因于微生物氮合成增加（13.3%，P > 0.10）。本研究中DRB、SRB-C和SRB-T的比较饲喂价值分别为SFC的90%、92%和96%。（摘要截断于250字）
