Estimation on Protein Requirement for Maintenance and Dietary Protein Digestion in Adult Steers;
成年阉牛对饲粮蛋白质的消化及维持需要量的估计
Six 500～600kg steers with ruminal,duodenal and ileac cannula were fed with high level(HL),middle level(ML)and low level(LL)diets in turn based on corn,cottonseed meal and ammoniated rice straw.
选择6头体重500～600kg ,安装有瘤胃、十二指肠前端和回肠末端瘘管的阉牛 ,分3期饲喂以玉米、棉籽饼和氨化稻草为基础原料配合的3种不同饲养水平的日粮 ,测定十二指肠、回肠和粪便中的粗蛋白质和各种必需氨基酸流量 ,计算粗蛋白质、真蛋白、总必需氨基酸、总非必需氨基酸和各种必需氨基酸在小肠内的表观消化率。
A 4×3 Latin Square experiment was carried out to study the effect of dietary nitrogen source structure on digestion and metabolism, microbic protein yield, nitrogen availabilities and rumen fermentation of steers.
采用安装瘤胃瘘管的西门塔尔改良架子牛阉牛3头 ,通过4×3不完全拉丁方设计 ,系统研究了4种不同氮源结构的日粮对阉牛消化代谢、微生物蛋白合成、N利用和瘤胃发酵的影响。
Three crossbred beef cattle fitted with ruminal cannula were used to determine the changes of the amino acid(AA)profiles(g AA/100g AA)between original(O)feedstuffs or diets and their residues after8h(R-8)、12h(R-12)or16h(R-16)ruminal incubation by nylon-bag technique.
选用3头装有瘤胃瘘管的改良阉牛 ,利用尼龙袋技术对不同饲料降解后残渣的氨基酸(AA)组成与原料AA组成的差异进行了研究。