Deacon M A, De Boer G, Kennelly J J
Department of Animal Science, University of Alberta, Edmonton, Canada.
J Dairy Sci. 1988 Mar;71(3):745-53. doi: 10.3168/jds.s0022-0302(88)79614-9.
In situ rumen degradation and intestinal digestibility of DM and CP of Jet-Sploded and extruded protein sources were estimated, using two ruminally and duodenally cannulated lactating Holstein cows, in two experiments. One-gram samples of ground (1 mm) whole canola seed, canola meal, extruded canola meal, Jet-Sploded whole canola seed, Protec, soybean meal and extruded soybean meal (Experiment 1), and whole canola seed Jet-Sploded at temperatures ranging from 116 to 177 degrees C (Experiment 2) were heat sealed into small nylon bags for incubation in the rumen and insertion into the duodenum. Extrusion had no effect on DM or CP disappearance in the rumen nor on effective degradability. Jet-Sploding of whole canola seed dramatically reduced effective degradability (%) of DM (80.5 vs 35.9 at .08 h-1 rumen outflow rate) and CP (83.5 vs. 43.2 at .08 h-1). Total tract disappearance of DM and CP exceeded 90% for all protein sources, except Protec and Jet-Sploded material. Jet-Sploding appears to have potential for decreasing ruminal degradation of canola protein or DM without markedly decreasing intestinal digestibility.
在两项试验中，使用两头安装有瘤胃和十二指肠瘘管的泌乳荷斯坦奶牛，对喷射爆裂和挤压处理的蛋白质来源的干物质（DM）和粗蛋白（CP）的瘤胃原位降解率和小肠消化率进行了评估。将1克磨碎（1毫米）的全油菜籽、油菜籽粕、挤压油菜籽粕、喷射爆裂全油菜籽、Protec、豆粕和挤压豆粕（试验1），以及在116至177摄氏度范围内喷射爆裂的全油菜籽（试验2）热封入小尼龙袋中，用于在瘤胃中孵育并插入十二指肠。挤压处理对瘤胃中DM或CP的消失率以及有效降解率均无影响。全油菜籽的喷射爆裂显著降低了DM的有效降解率（在瘤胃流出率为0.08小时-1时，分别为80.5%和35.9%）和CP的有效降解率（在瘤胃流出率为0.08小时-1时，分别为83.5%和43.2%）。除Protec和喷射爆裂处理的物料外，所有蛋白质来源的DM和CP的全肠道消失率均超过90%。喷射爆裂似乎有潜力降低油菜籽蛋白或DM的瘤胃降解率，而不会显著降低小肠消化率。
