共查询到20条相似文献,搜索用时 62 毫秒
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蛋白质是水产动物生长的重要营养元素,也是影响饲料成本的重要因子。而作为水产动物饲料的重要蛋白源-鱼粉,由于其资源量下降,价格昂贵,致使饲料成本过高。因此,寻找新的替代鱼粉的蛋白源,引起了养殖业的关注。一些学者通过动植物蛋白比的研究,发现鱼类、虾以及蟹饲料中适宜的动植物蛋白比有利于动物的生长。相反饲料中的动物蛋白比例过高,并不能取得较好的养殖效益。 相似文献
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渔业和水产养殖产品在满足不断增长的人口粮食需求方面发挥着重要作用。鱼粉是水产养殖业中最主要的蛋白来源之一,然而由于资源存量变化和海洋环境的恶化,导致鱼粉价格攀升和产量下降,亟需寻求新型可替代蛋白源来满足水产养殖业的可持续性发展。单细胞蛋白是从藻类、真菌和细菌等单细胞微生物中提取的一种蛋白原料,目前被广泛用作水产动物配方中的蛋白质/氨基酸来源、脂肪酸来源以及生物活性成分来源,且在配方中的占比正在逐步增加。文章重点介绍了单细胞蛋白作为饲料蛋白原料在水产养殖营养和水产膨化饲料中的应用现状。 相似文献
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朱钦龙 《畜牧兽医科技信息》2003,19(2):40
配制养鱼饲料的蛋白质和脂肪来源大多依赖于水产加工品一鱼粉和鱼油.然而,海洋原料鱼的减少,价格上扬以及人类对养殖鱼类消费量的增加,世界各国都在探索鱼粉和鱼油的替代品,研制开发新型养鱼饲料.…… 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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