Chen K H, Huber J T, Theurer C B, Swingle R S, Simas J, Chan S C, Wu Z, Sullivan J L
Department of Animal Sciences, University of Arizona, Tucson 85721.
J Dairy Sci. 1994 Apr;77(4):1038-43. doi: 10.3168/jds.S0022-0302(94)77039-9.
The objective of this study was to compare the relative feeding value of sorghum versus corn grain in rolled or steam-flaked forms in diets for lactating dairy cows. Twenty-four Holstein cows (averaging 110 DIM) were divided into four groups and fed diets of 40% grain as dry-rolled sorghum, steam-rolled corn, steam-flaked sorghum, or steam-flaked corn for 70 d. Compared with rolling, flaking of both grains increased yields of milk, milk protein and fat, and protein percentage of milk, but differences tended to be greater for sorghum than for corn. Efficiency of feed utilization was higher for steam-flaked than for dry-rolled sorghum but was unaffected by corn processing. Flaking of both grains increased total tract digestibilities of DM, OM, CP, starch, ADF, and NDF. Estimates for NEL were 21% higher for flaked than for rolled sorghum and 6% higher for flaked than for rolled corn. No differences in performance of cows existed between corn and sorghum grains. Cows fed 40% of their diet as steam-flaked sorghum or corn yielded more milk and milk protein than those fed the rolled form of the grains, and no differences existed between types of grain fed.
本研究的目的是比较在泌乳奶牛日粮中，碾压或蒸汽压片形式的高粱与玉米粒的相对饲喂价值。将24头荷斯坦奶牛（平均产犊后110天）分为四组，分别饲喂以干碾压高粱、蒸汽碾压玉米、蒸汽压片高粱或蒸汽压片玉米作为40%谷物来源的日粮，为期70天。与碾压相比，两种谷物压片均提高了牛奶、乳蛋白和乳脂产量以及乳蛋白百分比，但高粱的差异往往比玉米更大。蒸汽压片高粱的饲料利用效率高于干碾压高粱，但玉米加工方式对其没有影响。两种谷物压片均提高了干物质、有机物、粗蛋白、淀粉、酸性洗涤纤维和中性洗涤纤维的全肠道消化率。压片高粱的净能估计值比碾压高粱高21%，压片玉米的净能估计值比碾压玉米高6%。玉米粒和高粱粒对奶牛生产性能的影响没有差异。日粮中40%为蒸汽压片高粱或玉米的奶牛比饲喂碾压形式谷物的奶牛产奶量和乳蛋白产量更高，且所饲喂的谷物类型之间没有差异。
