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β-甘露聚糖酶是一种新型的内切酶制剂,能够水解甘露聚糖等含有β-1,4-D-甘露糖苷键的非淀粉多糖,具有消除抗营养因子的作用。β-甘露聚糖酶不仅能够降低肠道黏度,促进营养物质的高效吸收,还能够分解甘露聚糖,使植物性饲料细胞壁中包裹的营养物质得到充分释放,提高饲料的利用率。甘露寡糖具有益生元的作用,通过调节肠道微生物菌群平衡优化肠道环境,增强机体免疫力。β-甘露聚糖酶作为饲料添加剂用于动物生产,可改善畜禽的生长性能和饲料转化率,促进动物生长发育。文章就β-甘露聚糖酶的来源、分子结构、生物学功能及其在动物生产中的应用进行综述,为β-甘露聚糖酶在饲料中的研究与应用提供参考。 相似文献
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β-甘露聚糖酶对蛋鸡后期产蛋性能的影响 总被引：6，自引：0，他引：6
在豆科植物细胞壁中含有一定量的 β -甘露聚糖。β -甘露聚糖是甘露单糖的复合物 ,结构复杂 ,是饲料抗营养因子之一 ,影响禽类对饲料的消化吸收 ,降低饲料利用率。β -甘露聚糖酶能分解β -甘露聚糖 ,使之分解为甘露寡聚糖 ,从而降低β -甘露聚糖对消化吸收的不利影响 ,提高饲料的营养价值。为进一步研究在蛋鸡日粮中添加不同水平的 β -甘露聚糖酶对蛋鸡后期生产性能的影响 ,我们进行了本次试验。1 材料与方法1 1 试验动物与分组 选用 72 0只 64周龄罗曼蛋鸡 ,随机分为 4组 ,每组 1 80只 (每组内设 30个重复 )。在同一基础日粮条件下… 相似文献
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甘露聚糖酶在动物生产中的应用 总被引：3，自引：0，他引：3
β-甘露聚糖及衍生物广泛存在于豆科植物的细胞壁中,β-甘露聚糖酶能降解粕类日粮中的抗营养因子β-甘露聚糖,改善日粮利用效率,提高畜禽生产性能.文章系统论述了甘露聚糖的抗营养作用、β-甘露聚糖酶的作用机制及在动物生产中的研究进展,为甘露聚糖酶在畜牧业中合理应用提供参考. 相似文献
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乙型甘露聚糖酶对商品肉鸡生产性能的影响 总被引：2，自引：0，他引：2
乙型甘露聚糖广泛存在于饲料中,是植物细胞壁最基本的构成成分,单胃动物对其消化吸收利用率极低,而且对其它营养素的消化有严重封阻作用。因此它存在于饲料中,严重地影响饲料的消化利用。美国ChemGen公司研制的乙型甘露聚糖酶,能将细胞壁中的乙型甘露聚糖分解成葡萄糖,同时解除了细胞壁对其它营养素的封阻,从而提高其它营养素的消化吸收率。 目前乙型甘露聚糖酶在美国已得到广泛应用,产生了很好的经济效益。经中国农垦进出口公司介绍,农 相似文献
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植物细胞壁主要由纤维素、半纤维素及木质素等物质构成。甘露聚糖是植物半纤维素的重要组分,是由β-1,4-D-甘露糖连接而成的线状多聚体,在多糖的侧链上主要有葡萄糖基、乙酰基和半乳糖基等取代基团。甘露聚糖具有高亲水性,在单胃动物的消化道内大量吸水,增加了消化道内容物的黏度,抵抗胃肠蠕动,直接影响动物对营养物质的消化吸收。近年来,随着豆类产品(豆粕等)在动物饲料中的广泛应用,甘露聚糖的抗营养作用也越来越受到重视,在饲料中添加酶制剂是解决这一问题的主要途径。甘露聚糖的完全酶解需要β-甘露聚糖酶、β-甘露糖苷酶、β-葡糖苷酶… 相似文献
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微生物β-甘露聚糖酶的制备与应用研究进展 总被引：1，自引：0，他引：1
β-甘露聚糖酶是-β1,4-D-甘露聚糖酶的简称,是一类能够水解含有-β1,4-D-甘露糖苷键物质的内切性水解酶。它广泛存在于自然界中,包括一些低等动物、豆类植物,而微生物则是β-甘露聚糖酶的主要来源。微生物来源的β-甘露聚糖酶具有活性高、成本低、来源稳定、提取方便以及比动植物更广的作用pH、温度范围和底物专一性等显著特点,应用前景极其广阔。文章综述了微生物β-甘露聚糖酶的来源、制备、性质、作用机制及其在饲料、食品、轻工、石油工业等方面的应用。 相似文献
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Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
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在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
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Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
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