Dawson D P, Morrill J L, Reddy P G, Minocha H C, Ramsey H A
Department of Animal Sciences, Kansas State University, Manhattan 66506.
J Dairy Sci. 1988 May;71(5):1301-9. doi: 10.3168/jds.S0022-0302(88)79687-3.
Thirty-two male calves (8/treatment) in Trial 1 and 41 male and female calves (10 or 11/treatment) in Trial 2 were fed milk replacers containing 100% of the total protein from milk sources or 25% from milk and 75% from a soy product: soy protein concentrate; commercial heated (fully cooked) soy flour; or experimental soy flour for 6 wk. The experimental flour received moist heat sufficient to reduce trypsin inhibitor to 1 unit/mg. Calf performance improved with age on all diets. Growth, protein and dry matter digestibility, nitrogen retention, and morphology of the intestinal mucosa of calves on the all milk-protein diet were superior to those of calves on diets containing a soy product. All soy-fed groups had a humoral but no cell-mediated immune reaction to soy proteins. Soy protein concentrate and the experimental heated soy flour were superior to the commercial heated soy flour as protein sources for milk replacer.
试验1中有32头雄性犊牛（每组8头），试验2中有41头雄性和雌性犊牛（每组10头或11头），分别饲喂含100%乳源总蛋白的代乳粉，或含25%乳源蛋白和75%大豆制品（大豆浓缩蛋白、商业加热（完全煮熟）大豆粉或试验大豆粉）的代乳粉，为期6周。试验大豆粉经湿热处理，使胰蛋白酶抑制剂含量降至1单位/毫克。所有日粮条件下，犊牛的生长性能均随年龄增长而改善。全乳蛋白日粮组犊牛的生长、蛋白质和干物质消化率、氮保留率以及肠黏膜形态均优于含大豆制品日粮组的犊牛。所有大豆饲喂组对大豆蛋白均有体液免疫反应，但无细胞介导免疫反应。作为代乳粉的蛋白质来源，大豆浓缩蛋白和试验加热大豆粉优于商业加热大豆粉。
