浅谈母猪胚胎死亡的原因及综合预防措施

母猪胚胎死亡给养猪业带来重大损失。有关资料报导,母猪在妊娠期内约有40％左右的胚胎死亡。因此,降低胚胎死亡率,提高母猪窝产仔数,直接关系到养猪业的兴衰和经济效益好坏。本文就造成母猪胚胎死亡原因及预防措施作一综述。 母猪胚胎死亡的原因 胚胎死亡主要集中在受精卵着床初期、器官形成阶段和妊娠的60-70天三个高峰     

母猪胚胎死亡的原因分新及防控措施

根据统计．母猪胚胎死亡率大约在25％～40％．特别是在环境不良、营养缺乏、受疫病侵害等条件下．胚胎死亡率会更高。胚胎死亡的第1个高峰是在合子附植初期（在配种后的9～16天），胚胎易受各种因素的影响．死亡率为40％～50％：第2个高峰是在配种后的第3周．胚胎死亡率为30％～40％。为了提高母猪的胚胎成活率．提高养殖户的经济效益．笔者总结出造成母猪胚胎死亡的九大因素及对策．以供参考．     

猪胚胎死亡原因及其防制措施

通过对母猪胚胎死亡时期及胚胎死亡原因的探讨,提出了遗传因素、母体营养、内分泌因素、排卵数与子宫内环境、热应激因素及疾病因素是造成猪胚胎死亡的原因,母猪胚胎的死亡给养猪业带来很大损失。从而进一步提出了防制猪胚胎死亡的措施,以降低胚胎的死亡率,提高母猪的妊娠率和分娩率,促进养猪业的发展。     

猪胚胎死亡的原因分析

胚胎死亡是影响家畜繁殖率的重要因素。家畜的胚胎死亡率为25％～40％。猪是多胎家畜．胚胎死亡较常见且胚胎在发育的任何时期都有可能死亡．特别是在胚胎向子宫内膜附植之前或附植过程中即妊娠识别的最关键时期。当母猪处于不良环境．营养缺乏．受疾病侵害等时候，胚胎死亡更为严重。母猪第一个胚胎死亡高峰是合子附植初期9～16d．胚胎易受各种因素影响．死亡率在40％～50％：第二高峰是配种后第3周．死亡率为30％～40％。但在一般情况下，少部分胚胎死亡，不会影响妊娠的正常进行。     

妊娠母猪胚胎死亡的原因及防治对策

针对导致母猪生产水平低原因之一胚胎死亡问题开展研究,通过对猪胚胎发育危险期的分析,探讨了造成胚胎死亡的遗传、营养、疫病、环境、药物及其他因素,提出了提高胚胎成活率的综合措施,为养猪生产中提高母猪产仔率提供参考。     

怀孕母猪的饲养环境及饲养管理

母猪每次发情排出的卵子．大约只有一半能在分娩时成为活的仔猪．在母猪配种后第3周有30％-40％的胚胎会发生死亡．此后还会发生少量胚胎死亡。影响胎儿存活的因素很多，遗传上的原因造成的胎儿死亡是不可避免的。但不良的饲养环境、营养及管理因素也会增加胎儿死亡。     

猪胚胎死亡原因分析及防止办法

猪胚胎死亡原因分析及防止办法徐树臣刘岩张全双刘志武（黑龙江省齐齐哈尔种畜场）（黑龙江省畜牧研究所）李国英张淑英江福彬何森冯霞（大庆油建公司猪场）（拜泉县清泉猪场母猪胚胎的死亡给养猪场带来极大的损失。有关资料报导，母猪在妊娠期内约有４０％左右的胚胎死亡...     

猪胚胎发育差异性影响因素与成活率

母猪妊娠期胚胎死亡是影响猪窝产仔数的主要因素而导致妊娠期胚胎死亡的原因十分复杂，其中胚胎差异性是导致胚胎死亡的重要因素之一。本文阐述了胚胎发育差异性与成活率的关系。     

猪胚胎发育差异性影响因素与成活率

母猪妊娠期胚胎死亡是制约增加猪窝产仔数的瓶颈。导致妊娠期胚胎死亡的原因十分复杂,其中胚胎差异性是导致胚胎死亡的重要因素之一。本文就胚胎差异性影响因素与成活率的关系作一综述。     

妊娠母猪营养与饲料

1妊娠母猪的分阶段饲养 1．1妊娠初期 配种～配种后28天为妊娠初期．母猪饲养的目标是减少胚胎的死亡。受精卵移动到子宫角大约需要11～12天时间，然后胚胎开始着床，大约在第24天结束，胚胎如不能着床就会死亡，导致胚胎存活率过低，最终导致产仔数减少。妊娠初期是胚胎死亡的第一个高峰，其主要原因是母猪摄入的营养物质浓度过高，会减少孕酮的分泌，因此妊娠初期应控制母猪的采食量，使其摄入的营养能够满足其自身需要，包括青年母猪自身生长发育的需要即可。所以母猪一旦配种以后应立即改用妊娠母猪料，且控制日饲喂量为1．6-2．0千克：     

奶牛肢蹄病及其防治

简介常见奶牛肢蹄病种类及其症状,从日粮营养、运动场地面结构、环境卫生、饲养管理、遗传育种、疾病管理等方面简析奶牛肢蹄病的病因,并提出相应的预防措施。     

Disease and destiny-mystery and mastery

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.     

Foot and mouth disease and bluetongue: differences and similarities

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.     

畜禽物种多样性及其保护和利用

文章就我国畜禽物种多样性资源的现状、保护和利用等方面进行阐述,为生态脆弱的喀斯特地区畜牧业可持续发展提供参考。     

马的咽气癖及其防制措施研究进展

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。     

德国荷兰畜禽产品质量安全交流与启示

2018年岁末,笔者有幸赴德国和荷兰,就畜产品质量安全控制及检测技术等进行了短期交流,收获颇丰,现具体介绍如下。一、交流情况德国面积35.73万平方千米,人口约8175.2万,是欧盟人口最多的国家,农业发达,机械化程度很高。德国的畜牧业以猪、牛、羊和禽类为主,畜牧业产值占农业生产总值的61%。德国虽然农业比重很小,但却是有机农业运动最早的发起国,也是目前世界上有机农产品生产与消费大国。     

广西芒果主要病虫害及其防治

广西是我国主要的芒果生产基地。随着基地建设的发展,芒果病虫害已成为目前栽培管理的主要问题。为此,在调查、研究的基础了介绍了当前芒果生产中常见的病虫害,并提出了防治措施,以期为生产上提供技术参考。     

牛羊焦虫病诊断与防治技术

近几年来,辽宁省牛羊饲养业迅速发展,焦虫病的危害越来越明显,已成为危害牛羊的主要疾病之一。为了提高牛羊焦虫病的防治水平,保证我省牛羊饲养业的健康发展,笔者在参阅文献和同行们诊疗经验的基础上,结合自己的治疗实践,详细阐述了我省牛羊焦虫病近几年的流行特点和诊断防治方法。