共查询到20条相似文献，搜索用时 78 毫秒
1.
2.
金生龙 《兽药与饲料添加剂》1998,3(6):28-29
铬用于畜禽的研究始于叨年代初，并显得日渐活跃。研究结果表明，铬参与动物体内糖、脂肪、蛋白质的代谢，降低应激、改善机体免疫机能，提高畜禽生产性能和繁殖力等。1作用机理人们已经很清楚认识到络是人和动物所必需的一种微量元素，有许多综述阐述了铬在人类营养中作用。钻 相似文献
3.
4.
铬是动物机体必需的微量元素之一,在动物机体代谢中起着重要作用,铬在体内主要以三价铬形式存在。铬作为葡萄糖耐受因子（GTF）的组成部分,可促进胰岛素功能的发挥,参与机体糖、脂、核酸与蛋白代谢,降低血糖和脂肪沉积,维持RNA结构完整性,促进氨基酸吸收和转运。铬广泛应用于畜禽生产,在调节机体稳态、改善畜禽应激等方面具有良好作用。在奶牛生产方面,铬能够调控奶牛瘤胃pH值、氨态氮（NH3-N）和挥发性脂肪酸（VFA）浓度;缓解奶牛热应激,增强奶牛免疫力;通过血糖调节改善奶牛产后能量负平衡,促进奶牛产后恢复;调控奶牛生殖激素水平,提高奶牛的繁殖性能。文章结合铬的生物学机制,综述铬在调控瘤胃发酵、改善奶牛生产和繁殖性能等方面的应用,为铬高效地在奶牛生产中的应用提供参考。 相似文献
5.
铬在鸡热应激下的作用 总被引：1，自引：0，他引：1
微量元素铬是动物机体生长和发育所必需的营养成分，不仅参与三大物质的代谢，而且可以促进动物生长、改善繁殖性能、提高胴体品质、提高机体免疫力、降低应激。而现在铬在禽热应激上的应用的研究是最热门的。 相似文献
6.
7.
8.
9.
10.
11.
12.
13.
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
14.
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
15.
16.
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
17.
18.
19.