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《江西畜牧兽医杂志》2004,(4):4-4
自2003年10月以来玉米价格稳步上涨,现就其影响因素及发展方向作一总结分析。1.我国出口玉米大幅减少,相应美国玉米出口增加,有助于国际市场玉米价格高起,与国际市场玉米价格相比国内玉米价格还有一定的上涨空间。2.短期看,玉米进口压力不大,尽管国内价格近期大幅攀升;但相对而言依然便宜,且两者品质差别不大。3.呈现产不足需,供求趋紧,库存下降的局面。4.运费增加,国内、国际运费都呈上涨之势。5.粮价上涨的影响。目前,农民和粮食部门惜售导致短期供应紧张,也导致市场价格不断上涨。6.消费需求预计提高,除饲料需求外,近年来加工业(如乙醇产… 相似文献
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国内市场玉米供给充足，局部地区可能出现供给紧张状况。由于上半年禽流感影响了养殖业对玉米的正常需求和玉米出口的大幅削减，我国玉米市场始终处于供大于求状态，也就是说，从总量上看，玉米市场供给充足。但是，在广西、福建、浙江、山东和河南等地，可能因为需求增加、运输紧张和自然灾害等原因出现局部供给紧张的局面，玉米价格也会因此出现快速上涨的现象，局部地区的价格上涨能否带动全国性的玉米价格上涨值得市场关注。笔者认为，下半年以来，玉米价格已经趋于活跃，市场交易秩序在国家宏观调控 相似文献
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迈入2008年，国际市场玉米价格节节攀升，屡创历史新高。反观国内玉米期现货市场，尽管在国际市场玉米价格大涨带动下，玉米价格底部稳健攀升，但无论从涨幅上还是从绝对量上都远远低于国际市场玉米价格。那么，是什么因素造就当前这种国内外价差严重背离的市场状况哪？笔者认为， 相似文献
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2004年3月份,玉米市场供需形势发生变化,玉米价格出现了季节性大幅上涨行情。4月份之后,我国玉米供需形势将发生怎样的变化?玉米价格的上涨潜力有多大?影响玉米价格上涨的因素有哪些?就此,下面对我国玉米市场供需及价格走势进行了深入分析。1产需缺口增大、库存大幅降低影响全年玉米价格走势据2月份世界粮油市场月报显示,我国玉米连续4年减产,2003年总产量约在1.14亿t;在产量下降的同时,我国玉米库存数量也大幅降低,预计2003/2004年度期末库存将降至1949万t,比2002/2003年度下降2350万t(如图1),据悉这些数据来自美国农业部,其准确程度没有考… 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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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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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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