脱毒桐籽饼(粕)蛋白质及能量营养价值评价

选用8头30kg的阉公猪和6只1.7kg的伊莎褐公鸡分别对3种脱毒桐籽饼(粕)Ⅰ、Ⅱ和Ⅲ的蛋白质、氨基酸消化率、代谢率进行了测定。结果表明 :3种脱毒桐饼(粕)Ⅰ、Ⅱ和Ⅲ的蛋白质含量分别为31.17 %、35.12 %和23.98 % ;总氨基酸含量为226.93mg/g、278.38mg/g和178.71mg/g,其中赖氨酸含量4.14mg/g、5.01mg/g和3.47mg/g ,蛋氨酸含量为1.24mg/g、1.33mg/g和0.92mg/g ;能量(GE)为17.72kJ/g、16.42kJ/g 和18.02kJ/g。脱毒桐粕Ⅰ的蛋白质消化率为75.15 % ,消化能为12.85MJ/kg;脱毒桐饼(粕)Ⅰ、Ⅱ的表观代谢能分别为4.88MJ/kg 和6.29MJ/kg,真代谢能为5.53MJ/kg 与6.94MJ/kg。3种脱毒桐饼(粕)的氨基酸之间存在不平衡状况 ,从限制性氨基酸的角度来看 ,脱毒桐饼(粕)的第一限制性氨基酸是蛋氨酸、第二限制性氨基酸为赖氨酸。     

一类时滞微分系统有界解的收敛性

研究了一类时滞微分系统解的渐近性态．在一些比已有文献通常附加的局部李普希兹条件更弱的条件下，证明了此系统的每个有界解趋于某平衡态．我们的结果推广了已有的一些结论．     

Nutritive constituents of Silky fowl eggs: comparison with hen eggs of White Leghorn origin

In the present study, proportional parts, amounts of major constituents, vitamins, minerals and fatty acids composition of Silky fowl eggs were examined compared with those of hen eggs. The ratio of egg yolk weight to whole egg weight of Silky fowl egg was significantly larger than that of egg yolk of hen egg. The amount of cholesterol of Silky fowl eggs were significantly (P < 0.01) less than those of hen eggs. The amount of vitamins (B2, B6, D and E), calcium and potassium in Silky fowl eggs were significantly higher than those of hen eggs. Unsaturated fatty acids in Silky fowl eggs were 62.5% among total fatty acids, the unsaturated fatty acids of hen eggs were 53.9%. Especially, the contents of arachidonic acid, docosapentaenoic acid and docosahexaenoic acid in Silky fowl eggs were significantly larger than in hen eggs.     

新疆沙尔套山四季放牧草地主要牧草营养价值变化特征研究

以新疆昭苏县域内沙尔套山分布的12种主要牧草为研究对象,对其营养物质和瘤胃体外消化率特征进行分析,以期揭示各牧草营养物质和消化率的季节性变化规律。结果表明,各牧草的营养物质含量和消化率特征指标均存在明显的季节性变化规律。通过模糊相似优先比分析,综合营养物质(干物质、粗蛋白、中/酸性洗涤纤维、粗脂肪、粗灰分)和瘤胃体外消化率特征(有机物消化率、代谢能)的8项指标进行综合营养价值评价,主要结论为:1)研究区放牧草地12种主要牧草中针茅、芨芨草、紫花鸢尾综合营养价值最佳季节在春季营养生长期(6月),其余牧草均为夏季开花期(7月)。2)春季营养生长期(6月)和秋季果后营养期(9月),综合营养价值最好的均为鸭茅;夏季开花期(7月),综合价值最好的牧草为西伯利亚羽衣草;秋季结实期(8月),综合营养价值最好的牧草为红花车轴草;冬季停止生长(10月)和枯草期(11月),综合营养价值最好的分别为针茅和紫花鸢尾。     

基于信号博弈的阳澄湖大闸蟹绿色标签市场应用分析

水产品绿色标签对消费者来说是高质量的信号,对卖家来说则是卖出高价的资本.但是欺诈行为的存在损害了消费者和其他卖家的利益,扰乱了市场秩序.以阳澄湖大闸蟹为例,通过信号博彝理论,对螃蟹市场中关卖双方的消费行为进行博彝分析,得到了精炼贝叶斯Nash均衡.     

Effect Of Replacing Fish Meal With Blood Meal On Chemical Composition Of Supplement For Nile Tilapia (Oreochromis Niloticus)

The objective of the work was to evaluate the effect on the nutrient content of replacing fish meal (FM) with blood meal (BM) in fish supplement. Three isonitrogenous diets (35% crude protein) were formulated using FM as the main source of animal protein (BM0); 50% replacement of FM with blood meal (BM50); or 100% replacement of FM with BM (BM100). The chemical composition (ash, crude protein, crude fat and crude fibre) and amino acid composition were determined. Replacement of FM with BM did not affect the proximate composition of the diet apart from ash content which decreased with the level of substitution. Substituting fish meal with blood meal reduced the levels of methionine, lysine, isoleucine, leucine, proline, valine and increased the levels of arginine, phenylanine and alanine in the diet. Amino acid indices revealed that BM0 had more amino acids with the highest chemical scores followed by BM50 and BM100. In all the diets, methionine was the most limiting amino acid. The essential amino acid index of the diets reduced with the level of replacement of FM (0.94, 0.88 and 0.77). The study showed substitution of up to 50% FM with BM gave a useful protein diet and 100% gave almost a poor protein diet.     

体外发酵法评定不同茬次和生长年限苜蓿的营养价值

本试验采用瘤胃体外发酵技术比较研究了不同茬次和生长年限紫花苜蓿的营养价值及体外发酵特性。试验以3头装有永久性瘤胃瘘管的荷斯坦奶牛为瘤胃液供体,称量1 g苜蓿样品于含有10 mL瘤胃液和90 mL培养基的发酵瓶内,39℃体外发酵96 h,分别于24、48、72及96 h冰浴终止发酵,采样。结果显示:茬次、生长年限对苜蓿体外发酵产气量、氨态氮(NH3-N)和菌体蛋白(MCP)浓度均有显著影响(P0.05),茬次对苜蓿体外发酵营养物质降解率有显著影响(P0.05),且茬次与生长在苜蓿体外发酵产气量、营养物质降解率上均存在交互作用(P0.05)。发酵结束后,苜蓿的产气量,营养物质降解率及挥发性脂肪酸(VFA)、NH3-N和MCP浓度在第3茬最高。产气量、营养物质降解率、NH3-N浓度在1和4年龄较高,3年龄较低。综上,以1年龄第3茬和4年龄第3茬苜蓿营养价值较高,3年龄第2茬较低。     

营业税改征增值税的税率评估——基于可计算一般均衡模型的研究

营业税改征增值税是完善我国税制的一个重要举措，确定各个产业部门改征增值税后的税率是其中一个关键的环节。运用可计算一般均衡模型可以评估营业税改征增值税之后不同税率的选择对宏观经济和产业结构的影响。政策模拟的结果显示，目前正在实施的营业税改征增值税的试点方案权衡了对财政收入和经济增长以及经济结构的影响，是对经济运行影响较小的稳健选择。