不同加工工艺对玉米纤维饲料营养价值的影响

发布时间：2018-03-27 10:49

本文选题：玉米纤维饲料　切入点：瘤胃降解率　出处：《动物营养学报》2017年08期

【摘要】：本试验以干玉米纤维饲料(DCGF)和湿玉米纤维饲料(WCGF)为原料,分析加工工艺对玉米纤维饲料营养价值的影响。选取3头装有永久性瘤胃瘘管的干奶期荷斯坦奶牛为试验动物,采用常规方法测定DCGF和WCGF营养成分含量,采用尼龙袋法测定瘤胃降解特性,采用三步体外法测定瘤胃非降解蛋白质(RUP)的小肠消化率,采用NRC模型预测代谢蛋白质和必需氨基酸供给量。结果表明:1)DCGF常规营养成分中除中性洗涤纤维(NDF)、中性洗涤不溶粗蛋白质(NDICP)、酸性洗涤不溶粗蛋白质(ADICP)含量显著高于WCGF(P0.05)外,其他营养成分含量均差异不显著(P0.05);2)DCGF和WCGF的瘤胃NDF降解率差异不显著(P0.05),而DCGF的瘤胃干物质(4、24、48 h)、粗蛋白质(CP)降解率(12、24、48和72 h)及有效降解率显著低于WCGF(P0.05);3)DCGF的RUP含量显著高于WCGF(P0.05),而总可消化养分和微生物蛋白质、代谢蛋白质含量与DCGF差异不显著(P0.05);4)DCGF的RUP的小肠消化率显著低于WCGF(P0.05),但总可消化蛋白质含量差异不显著(P0.05);5)饲料RUP提供的必需氨基酸中,DCGF的RUP提供的组氨酸(His)、苯丙氨酸(Phe)、异亮氨酸(Ile)以及总必需氨基酸含量显著高于WCGF(P0.05)。综合得出,DCGF和WCGF都含有高含量的可利用纤维和蛋白质,可以作为奶牛良好的纤维和蛋白质源饲料,但DCGF的瘤胃CP降解率和RUP的小肠消化率较低,可能影响其蛋白质和氨基酸的营养价值。
[Abstract]:In this experiment, dry corn fiber feed DCGFand wet corn fiber feed WCGF were used as raw materials to analyze the effect of processing technology on the nutritional value of corn fiber feed. Three Holstein cows with permanent rumen fistula were selected as experimental animals. The nutritional components of DCGF and WCGF were determined by routine method, the degradation characteristics of rumen by nylon bag method, and the digestibility of rumen non-degradable protein (Rup) by three steps in vitro. The NRC model was used to predict the supply of metabolized protein and essential amino acids. The results showed that the contents of neutral washing fiber, neutral washing insoluble crude protein, acid washing insoluble crude protein and acid washing insoluble crude protein were significantly higher than that of WCGFN P0.05in the normal nutrient components of 1 / 1 DGF. There was no significant difference in the degradation rate of rumen NDF between WCGF and P0.05DGF, but the degradation rate of DCGF was significantly lower than that of WCGFP0.05CGF and DCGF. The degradation rate of crude protein and crude protein in DCGF was significantly lower than that of WCGFP0.05DGF-3DCGF at 72 h and 12? 247h), and the RUP content of DCGF was significantly lower than that of WCGFP0. 05DGF-3DCGF. The content of RUP in DCGF was significantly higher than that in WCGFP0. 05%. The total digestible nutrients and microbial proteins can be obtained from WCGFG P0.05, The intestinal digestibility of RUP with DCGF was not significantly different from that of DCGF. The digestibility of RUP was significantly lower than that of WCGFG / P0.05, but there was no significant difference in total digestible protein content (P 0.05).) the essential amino acids provided by RUP were histidine Hishe, phenylalanine and phenylalanine provided by RUP. The contents of total essential amino acids and total essential amino acids were significantly higher than those of WCGFG P0.05. It was concluded that both DCGF and WCGF contained high contents of available fiber and protein. It can be used as a good fiber and protein source for dairy cows, but the degradation rate of CP in rumen of DCGF and the digestibility of small intestine of RUP may affect the nutritional value of protein and amino acid.
【作者单位】：东北农业大学动物科学技术学院;
【基金】：国家奶牛产业技术体系项目(CARS-37)
【分类号】：S816

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