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董美英 《江西畜牧兽医杂志》2005,(3)
近年来,钙的营养功能及其对家禽的生产性能的影响日益受到重视。文章从钙的吸收、排泄、生理功能及钙的缺乏与过量等方面,阐述了钙的代谢特点及功能,探讨了钙在机体中的重要意义。 相似文献
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钙是畜禽最重要的常量矿物元素之一,在体内发挥着重要的生理和生化功能,血钙浓度主要通过PTH、CT和VD3种激素的共同调节来维持稳定。文章综述了钙的来源、营养功能、添加用量和消化吸收规律,并就实际生产中的常见缺乏症进行了系统介绍,这对于指导实践生产是很有帮助的。 相似文献
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董美英 《江西畜牧兽医杂志》2005,(3):3-4
近年来,钙的营养功能及其对家禽的生产性能的影响日益受到重视。文章从钙的吸收、排泄、生理功能及钙的缺乏与过量等方面,阐述了钙的代谢特点及功能,探讨了钙在机体中的重要意义。 相似文献
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1钙的主要功能钙是家禽生产所需的重要矿物质饲料,在家禽体内已发现的50多种无机物质中,钙占70%左右,钙的总量为体重的0.8% ̄1.2%。钙总量的95%和磷总量的85%分布在骨骼及牙齿中。骨组织中的磷和钙保持着稳定的比例关系,大致是1∶1 ̄2。钙参与血液凝固过程和肌肉收缩活动,维持心肌正常收缩与舒张呈节律交替进行,钙还对机体酸碱平衡,细胞渗透性及神经活动起着重要的调节作用。总之,钙参与体内复杂的新陈代谢过程。从生产的角度来说,成骨功能和形成蛋壳的功能显得更加重要。为了实现这2大功能,血钙和血磷必须保持一定范围内的恒定。据研究,母… 相似文献
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钙是构成骨骼和蛋壳的主要成分,主要功能是促进骨骼生长、形成蛋壳,调节神经、肌肉的正常活动,维持体内的酸碱平衡.如果日粮中钙水平不合理(过高或过低),对种鸡及其后代的健康和生产性能有很大的不良影响.肉种鸡产蛋期营养标准要求饲料中钙的含量为2.8%~3.3%,而在实际生产中,饲料中钙的含量往往高于此范围.现将肉种鸡长期食用高钙饲料所带来的危害简述如下. 相似文献
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1钙的主要功能钙是家禽生产所需的重要矿物质饲料,在家禽体内已发现的50多种无机物质中,钙占其70%左右,钙的总量约为体重的0.8~1.2%。钙总量的95%和磷总量的85%分布在骨骼及牙齿中。骨组织中的磷和钙保持着稳定的比例关系,大致是1:1~2。它们以磷酸氢钙和羟磷灰石的形式沉积在 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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