天然VE与合成VE的比较

VE是动物生长、繁殖所必需的营养物质.根据其来源可分为天然VE和合成VE,二者在生产工艺、化学结构、生物活性及未来的研究方向等方面存在较大差异,本文就此进行讨论分析.     

分子蒸馏在提取天然VE中的应用

我国是一个油脂生产量和消费量都很大的国家，年消费油脂量约800万t左右。随着我国人民生活水平的提高，人们对油脂品质的要求也逐步提高，油脂加工中的副产物，如油脚、皂脚、脱臭馏出物等也越来越多。同时，随着国内外对天然VE保健功能的日益了解和应用的不断深入。     

天然培养基与合成培养基灭菌方式的研究

试验选择5种天然培养基和5种合成培养基。每类培养基分装到20个三角瓶中,天然培养基分为2组(天然培养基Ⅰ组和Ⅱ组),合成培养基分为2组(合成培养基Ⅰ组和Ⅱ组)。天然培养基Ⅰ组、合成培养基Ⅰ组和天然培养基Ⅱ组、合成培养基Ⅱ组,在高压灭菌15min后,分别自然冷却降至压力为0和慢慢放气降至压力为0,然后放置培养箱中培养,并记录污染情况。结果显示,天然培养基适合自然降压灭菌,而合成培养基适合慢慢放气降压灭菌。     

鸡日粮中的天然和合成寡糖

本文以棉子糖系列寡糖为代表综述了天然和合成寡糖对肉鸡生产性能的影响，研究表明天然寡糖对动物健康和生产性能有负作用，但合成寡糖相反，这与寡糖的化学结构，添加量以及动物所处生理阶段有关，饲料中需要合成寡糖，但在深入了解其分子结构基础上，充分合理利用天然寡糖的有益片段，除去有害片段，合理使用天然寡糖或其廉价合成品，更具实际应用价值。     

VE对畜禽肉质影响的研究进展

VE是一种天然的生物抗氧化剂。饲粮中添加VE可提高畜禽肉品中VE的含量，提高肉中脂肪的稳定性，从而提高肉品品质。综述了VE的抗氧化机制及其对肉品品质的作用效果。     

VE对肉牛精液品质的影响

本试验以肉牛为研究对象,探讨日粮不同水平的VE对肉牛精液品质的影响.试验选择体况良好、体重相近、3周岁的肉牛20头随机分为4组,各组依次添加0、50、100、150g/d的VE.试验周期为60d.结果表明:日粮添加100g/d VE组的采精量比对照组显著提高42.95％(P<0.05);VE 3组的精子浓度均显著高于对...     

维生素E对猪肉品质的影响

过去几十年里,猪育种的主要目标是提高生产性能,但是在瘦肉率提高的同时肉质变劣;此外,在猪肉的储存和加工过程中,脂质的氧化也是导致肉品质恶化的主要原因。影响猪肉品质变劣的因素主要有遗传因素、营养因素、宰前处理和宰后处理等。解决在生产、贮存和加工过程中出现的猪肉品     

饲料中维生素E的荧光测定

用正交试验方法探讨了饲料中维生素E（VE）荧光测定过程中的各种条件，用抗坏血酸粉作抗氧化剂，用无水乙醇和160％KOH溶液进行皂化，用乙醚进行抽提，在λex292nm/λem340nm处测定VE，经与气相色谱法测得的结果比较后证明，用荧光法测定饲料中的VE简便可行。     

Comparison of biological activities of natural and recombinant chicken interferon-gamma

In recent years, chicken interferon-gamma (ChIFN-γ) has been identified and cloned from a chicken T cell line. In this study, recombinant ChIFN-γ produced in the baculovirus and prokaryotic (Escherichia coli) expression systems were characterized and their activity was compared to that of naturally ChIFN-γ produced by mitogen-activated splenic T cells. The baculovirus-derived ChIFN-γ protein (Bac-ChIFN-γ) proved to have physiochemical properties and biological activities similar to those of natural ChIFN-γ. Indeed, Bac-ChIFN-γ was able to inhibit the replication of cytolytic viruses in chicken embryo fibroblasts and to activate macrophages, as was determined by nitric oxide production. Levels ranging between 100 and 300 μg/ml of BacChIFN-γ could be obtained in the supernatants of infected insect cells. On the other hand, yields of the E. coli produced ChIFN-γ rarely exceeded 100 μg/ml after purification steps and although it was also able to activate the HD11 macrophage cell line in a specific manner, no anti-viral activity could be demonstrated. Therefore, the baculovirus expression system is an appropriate system for the high-level expression of biologically active ChIFN-γ and will allow further studies of the immunomodulatory and therapeutic effects of this cytokine in vivo.     

硒和维生素E对病毒致病性的影响

<正>硒(Se)是生物体必需的一种微量元素,维生素E是一种脂溶性的抗氧化剂,二者都是抗氧化应激的重要介质。近年来研究发现,硒或维生素E的缺乏会使病毒致病力增强、免疫反应发生改变;会导致     

饲料中维生素E的快速测定方法

维生素E又称生育酚,能维持生殖器官的正常机能,提高母畜繁殖能力;并且能促进机体代谢,提高免疫力和抗应激水平;维生素E还有抗氧化作用,可防止脂肪化合物、维生素A、维生素     

注射VE对鸡肉系水力影响的研究

试验选用母鸡腿肉为原料,首先采用单因素试验,将宰后1d的原料肉分为2组T1,和T2,每组分为3个重复.对照组T1注射肉重15%的VE浓度为0mg/g的无水乙醇溶液,试验组T2注射肉重15%的浓度为30mg/g的VE溶液,然后同时将试验组和对照组在4℃的环境下腌制24h,通过其煮熟率的测定,分析注射VE对鸡肉系水力有无影...     

Comparison of natural resistance in seven genetic groups of meat-type chicken

1. Several studies have shown that genetic variation exists in response to various Salmonella strains in mammals and poultry. In the current study immunocompetence traits related to natural resistance to Salmonella were measured in 7 genetic groups of meat-type chickens (in total 296 chickens involved). 2. Variables were measured of both innate (phagocytic activity) and adaptive immune responses that are important after a natural or experimental Salmonella enteritidis infection. Two traditional Old Dutch Breeds (groups 1 and 2), four commercial broiler groups (groups 3 to 6), and one experimental broiler group (group 7) were used. In two periods, birds of each group were killed for examination at ages between 14 and 35 d post hatch. 3. Significant differences between groups were found for most immune variables measured, with significant correlations between several of them. All groups produced an adequate immune response, of either the innate or the adaptive type. 4. In the current study, group 2 showed the highest overall natural resistance, though none of the groups was uniformly superior with respect to all traits measured. 5. In conclusion, for reliable measurements of general immunocompetence or resistance to Salmonella, for example, it is important to measure several aspects of the immune system.     

水产动物对维生素C和维生素E的营养需求

本文综述了水产动物中维生素C和维生素E的生理功能、缺乏症、营养需求、剂型选择等，并对最佳维生素营养(0VN)作了简要介绍。     

亚硒酸钠维生素E对奶牛繁殖性能的影响

采用对比试验设计,将40头中国荷斯坦妊娠母牛分为2组,各20头,在预产期前60～70天肌注亚硒酸钠维生素E50毫升/头.试验结果表明处理组母牛所产犊牛平均初生重40.75千克,比对照组38.62千克显著提高5.8%(p＜0.05);处理组奶牛产后没有胎衣滞留症状发生,而对照组有5头,表现出明显差异(p＜0.01).妊娠奶牛通过亚硒酸钠维生素E处理后,无论是自身健康状况,还是犊牛生长发育情况,均得到了明显改善.