应用康奈尔净碳水化合物-蛋白质体系和NRC模型评价4种粮食加工副产物的营养价值

发布时间：2018-07-23 11:55

【摘要】：本试验旨在应用康奈尔净碳水化合物-蛋白质体系(CNCPS)和NRC模型评价4种粮食加工副产物的营养价值。从东北地区4个不同牧场采集了玉米纤维饲料、大豆皮、甜菜粕和豆渣4种粮食加工副产物,测定其营养成分,应用CNCPS模型对蛋白质和碳水化合物组分进行剖分,并预测其潜在营养价值供给量,应用NRC模型估测可消化养分和能值。结果表明:1)中性洗涤纤维(NDF)的含量由高到低依次为大豆皮、甜菜粕、玉米纤维饲料和豆渣;非蛋白氮(NPN)的含量由高到低依次为玉米纤维饲料、豆渣、甜菜粕和大豆皮;甜菜粕的酸性洗涤不溶粗蛋白质(ADICP)含量最高,其余依次为大豆皮、豆渣和玉米纤维饲料,其中玉米纤维饲料和豆渣的ADICP含量差异不显著(P0.05)。2)非蛋白氮(PA,即NPN)含量由高到低依次为玉米纤维饲料、豆渣、甜菜粕和大豆皮;真蛋白质(PB)含量由高到低依次为大豆皮、甜菜粕、豆渣和玉米纤维饲料;不可降解氮(PC)的含量由高到低依次为豆渣、甜菜粕、大豆皮和玉米纤维饲料。3)可代谢蛋白质(MP)含量由高到低依次为豆渣、大豆皮、甜菜粕和玉米纤维饲料。4)玉米纤维饲料和豆渣的维持水平总可消化养分(TDNm)含量较高,二者差异不显著(P0.05);生产水平泌乳净能(NELP)值由高到低依次为豆渣、玉米纤维饲料、大豆皮和甜菜粕,其中玉米纤维饲料的NELP值与豆渣、大豆皮差异均不显著(P0.05);生产水平代谢能(MEP)值由高到低依次为豆渣、玉米纤维饲料、甜菜粕和大豆皮。由此可见,玉米纤维饲料和大豆皮可以作为奶牛的纤维源饲料;豆渣的过瘤胃蛋白质(RUP)、MP含量最高,可以作为奶牛的蛋白质源饲料。4种粮食加工副产物的能值由高到低依次为豆渣、玉米纤维饲料、大豆皮、甜菜粕。
[Abstract]:The purpose of this study was to evaluate the nutritional value of four grain processing by-products by using Cornell net carbohydrate-protein system (CNCPS) and NRC models. Corn fiber feed, soybean husk, sweet rapeseed meal and soybean dregs were collected from four different pastures in Northeast China, and their nutritional components were determined. The protein and carbohydrate components were divided by CNCPS model. The potential nutrient supply was predicted and the digestible nutrients and energy values were estimated by NRC model. The results showed that the content of (NDF) of neutral detergent fiber was soybean peel, sweet rapeseed meal, corn fiber feed and soybean dregs, the content of non-protein nitrogen (NPN) was corn fiber feed, soybean dregs, sweet rapeseed meal and soybean husk. The content of acid washed insoluble crude protein (ADICP) in sweet rapeseed meal was the highest, and the others were soybean husk, soybean dregs and corn fiber feed. There was no significant difference in ADICP content between corn fiber feed and soybean dregs (P0.05). The content of non-protein nitrogen (NPN) was in order of corn fiber feed, soybean dregs, sweet rapeseed meal and soybean husk, and the true protein (PB) content was soybean husk and sweet rapeseed meal. The contents of (PC) in soybean dregs, sweet rapeseed meal, soybean husk and corn fiber feed were soybean dregs, sweet rapeseed meal, soybean husk and corn fiber feed, respectively. The (MP) contents of metabolizable protein were soybean dregs and soybean husks, respectively. The content of total digestible nutrients (TDNm) of corn fiber feed and soybean dregs was higher than that of soybean dregs (P0.05), and the NELP value of production level was soybean dregs and corn fiber feed from high to low (P0.05), and the content of total digestible nutrients (TDNm) was higher than that of soybean dregs (P < 0.05). The NELP value of corn fiber feed was not significantly different from that of soybean dregs and soybean husk (P0.05), and the (MEP) value of production level was soybean dregs, corn fiber feed, sweet rapeseed meal and soybean husk. It can be seen that corn fiber feed and soybean husk can be used as fiber source for dairy cows, and the rumen protein (RUP) MP content of soybean dregs is the highest. The energy values of 4 kinds of grain processing by-products which can be used as protein source of dairy cattle are soybean dregs, corn fiber feed, soybean husk and sweet rapeseed meal in order of energy from high to low.
【作者单位】：东北农业大学动物科学技术学院;
【基金】：基金项目:国家奶牛产业技术体系(CARS-37)
【分类号】：S816.15

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