共查询到20条相似文献，搜索用时 768 毫秒
1.
2.
冬春季节,细菌、支原体和病毒等微生物均可引起鸡群发生呼吸道疾病,且发病率较高,同时还易造成继发或混合感染;为做好冬春季节的养鸡生产,本人结合多年工作经验浅析鸡慢性呼吸道病的诱因与防治,以期与业内同仁分享。 相似文献
3.
4.
鸡慢性呼吸道病是寒冷季节最常见的一种疾病,因其发病率高,传播快,病情严重,常并发或继发其它疾病而引起鸡群大量死亡。 经调查,此病在冬春寒冷季节难以控制的主要原因有:(1)发病诱因多而复杂。入冬后昼夜温差大、气温低以及舍内通风不良、有害气体浓度高、垫料易潮湿等是引发慢性呼吸道病的重要诱因。(2)病情复杂而严重。鸡感染后病情发展快。病原体很快侵入到下呼吸道、肺和气囊,引起肺炎和气囊炎,影响生长发育,使抵抗力下降,以致容易并发或继发大肠杆菌病及其它呼吸道疾病等造成病情复杂化。(3)病原体数 相似文献
5.
<正>近些年鸡群常发生一种由传染性因素(病毒、细菌、支原体等病原体)和非传染因素(环境、饲养管理等)多种致病因子引起的并发或混合感染的呼吸道疾病,称为鸡多病因呼吸道疾病。这种疾病在鸡群中普遍存在,而且诊断难度大,防制效果不明显,可长期或反复发生。1鸡群呼吸道综合征的成因(1)呼吸系统结构的特殊性。禽类所特有的气囊结构,决定了鸡的呼吸系统是从鼻到肺、至腹腔脏器、至骨骼及相关组织的"开放"系统。这意味着鸡只呼吸 相似文献
6.
正近年来,随着肉鸡规模化养殖的不断发展以及气候变化异常,养殖环境恶劣等因素的影响,呼吸道疾病日趋严重,给养鸡户造成了巨大的经济损失。尤其冬季,天气寒冷,气温多变,鸡舍通风就很有问题,俗话说"通风不良,鸡病难防",从而造成鸡群呼吸道疾病高发、多发。(一)发病原因1.生理因素。禽类所特有的气囊结构,使鸡的呼吸系统成为一个"开放"系统,极易发生呼吸道感染, 相似文献
7.
鸡慢性呼吸道病是由霉形体引起的接触性慢性呼吸道传染病，该病可导致免疫抑制，易与大肠杆菌结合感染，给养鸡业生产造成很大的经济损失。1发病特点鸡慢性呼吸道病一年四季均可发生，尤其在冬春季节流行严重。冬春气候寒冷，温度极易变化，促使鸡慢性呼吸道病的暴发或复发机会比其他季节大。尤其是鸡群密度过大，拥挤，通风不良等因素，舍内有毒有害气体浓度过大，如氨、二氧化碳、硫化氢浓度大时更是促使该病发生。此病呈慢性经过，病程长，发病率可达50％～60％以上， 相似文献
8.
冬春季节是肉鸡病毒性疾病的高发季节,特别是以呼吸道症状比较明显的禽流感、新城疫发病率更高。要想控制鸡群流感及其他病毒性疾病的发生,必须采取综合性防控措施:加强鸡群饲养管理,最大限度地减轻鸡群应激的发生,提高鸡群特异性和非特异性高抗病能力,鸡场实行严格的隔离、消毒措施,来控制疾病的发生。规模化商品肉鸡场,在冬春季节要加强肉鸡的标准化饲养管理。从疾病预防的观念出发,着重抓好以下几个方面的工作。1加强鸡群饲养管理,最大限度地减轻鸡群应激的发生 相似文献
9.
冬春季节养猪如何降低应激 总被引：1，自引：0，他引：1
应激的动物比正常动物更容易发病,在寒冷的冬春季节,应激对猪呼吸道疾病的影响更为严重。猪舍通风、温度、湿度、饲养密度、猪只饮水等多种因素都会造成应激。那么,冬春季节养猪如何降低应激呢? 相似文献
10.
鸡的呼吸道疾病在生产中比较多发,特别是冬春季节,其造成的损失占整个疾病损失的一半以上。其病因比较复杂,包括细菌、病毒、寄生虫感染等传染性性因素及有害气体、天气、应激、营养缺乏等非传染性因素,而且存在多种病因相互感染的现象,因此对鸡呼吸道病的病因进行分析并采取相应的防制措施,以期有效控制呼吸道病的发生。 相似文献
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.