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夏季防治鸡热应激的发生，是养好鸡并提高其生产性能的关键。10℃-32℃是鸡保持正常体温的环境温度，成鸡最理想温度是20℃—25℃，高于32℃使鸡发生热应激，当超过39℃时可造成鸡大批死亡。 相似文献
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温度是影响鸡生理、生产性能的重要因素之一。鸡是恒温动物,鸡的适宜环境温度为18～25℃,在此温度范围内,鸡表现出最佳的生产性能。若温度超过上限时,鸡就会发生热应激而影响其生产性能,而且随着气温的持续升高,会引起鸡的一系列生理和行为上的不良反应,严重时可迅速导致死亡。在我国大部分地区,每年都有较长时间的高温、高湿天气,对鸡的健康危害很大,这对养鸡生产极为不利。如何提高鸡的抗热应激能力或减少热应激,克服高温带来的有害影响,已成为养鸡生产能否成功,取得效益的关键。本文从几方面来讨论热应激对鸡的影响及防治措… 相似文献
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在我区 ,夏季天气较炎热 ,高温时间持续较长 ,在养鸡生产中 ,高温成为影响生产的重要因素 ,我们应意识到高温对鸡的不良影响 ,以采取有效的预防措施。鸡最适宜生存的温度是 2 1至 2 6℃ ,在此温度范围内 ,鸡生长最快 ,饲料利用率最高 ,当环境温度超过 3 2℃以上 ,就会造成热应激 ,热应激对鸡的生产性能影响非常大 ,因而在生产中应加以注意。1 热应激对鸡的影响鸡热应激的主要反应有 :采食量减少 ,饲料利用率降低 ,体重减轻 ,生长缓慢 ,抵抗力下降 ,易发生疾病。产蛋鸡产蛋量下降 ,蛋重减轻 ,蛋变小 ,蛋壳变薄、变脆 ,破壳蛋、软壳蛋多 ,蛋… 相似文献
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鸡是恒温动物，当环境温度超过其舒适区上限时，就会出现热应激，从而降低鸡的采食量，生产性能，饲料效率及产品质量，严重的表现为热喘息，甚至大批死亡。给蛋鸡生产造成严重经济损失。一般认为产蛋鸡舒适区温度为13℃～27℃，最大饲料效率的环境温度为24℃～27℃，肉鸡最大增长速度的环境温度为1O℃～22℃，最佳饲料效率的环境温度为27℃，热应激对鸡生产性能的影响是多方面的，因此在炎热来临时，应预先采取措施，避免热应激，缓解热应激带来的不良影响。 相似文献
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热应激对鸡的危害及防治措施刘忠琛张翠华（山东胶州市畜牧局２６６３００温度是影响鸡生产性能的重要因素之一，据测定，成鸡最理想的环境温度为２０～２５℃，在此温度范围内，鸡生长最快，饲料利用率也最高。过高的环境温度将会对鸡产生十分不利的影响，当温度达到３２... 相似文献
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鸡热应激是指鸡体在外界环境温度32℃以上时,由于体温过高及生理机能趋于紊乱而发生一系列异常反应。热应激影响到鸡的采食量、生产性能、饲料利用率以及产品质量,并可导致鸡在短时间内大量死亡,给养鸡生产带来损失。据有关资料显示,当外界温度达到27℃时,成年鸡便开始出现异常喘 相似文献
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我省地处亚热带气候,夏季高温持续时间长且温度高,当鸡舍温度达到32℃以上时,就会引起鸡生理及精神上的一系列不良反应,此时,鸡就陷入一种热应激状态;对鸡来说,热应激是众多应激原中最难处理的一种,是影响鸡生产性能发挥的重要原因之一。1鸡群热应激的特点1.1常见于通风不良舍温超过32℃、卫生条件较差的鸡群。热应激的严重程度随舍温的增高而加大并可迅速导致鸡因热应激而死亡。1.2种用鸡、体型较大的肉种鸡对热应激的耐受性较低,热应激发生时,往往是看上去体格健壮、身体较肥胖的鸡最先死亡。这种情况也常见于高产蛋鸡群。1.3夏季高温时的… 相似文献
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鸡热应激诊断及对策 总被引：3，自引：0，他引：3
夏天高温季节 ,鸡易发生热应激 ,使养鸡的经济效益下降 ,笔者在门诊常遇到鸡热应激的病例 ,根据多年的临床经验对鸡的热应激谈些看法。鸡热应激是指鸡在外界环境温度 32℃以上 ,由于体温调节及生理机能趋于紊乱而发生一系列异常反应 ,并伴随生产性能下降 ,甚至出现热休克和死亡。鸡热应激多发生于夏天高温季节 ,特别多见于密集饲养的集约化鸡群中 ,每只鸡所占有的收稿日期 :2 0 0 0 0 3 2 5空间较小而不利于鸡体体热的散发 ,甚至可因过度拥挤而出现高于周围环境温度的小环境 ,加重鸡群的热应激。在一昼夜之间 ,白天特别是午后气温较高 ,使… 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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近几年,世界饲用添加剂市场增长较快,预计今后将进一步增长,据世界粮农组织(FAO)首领会议的倡议,到2015年,将使世界营养不良的人口削减一半,其间,肉制品将会以每年2％的速度增长,特别是加快猪肉和禽肉增长。这将促进世界添加剂,尤其是蛋氨酸和赖氨酸需求量的增加。 相似文献
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