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由于工业的发展，环境污染日益严重，上世纪九十年代中期前，桐乡市推广的春用蚕品种因抗氟性和强健度弱，导致产量低、效益差，蚕农希望饲养强健好养的品种。因此我市于1996年引进了秋丰白玉，该品种耐氟、强健、丝质好而受到蚕农和丝厂的欢迎。但秋丰白玉品种在推广过程中也暴露出一些突出问题，一是该品种原蚕难养，繁育系数低，蚕种场经济效益差，生产量满足不了需求。二是农村饲养中，正交秋丰白玉带有限性斑纹的雌体易感病，稳产性差，蚕农不愿意饲养花蚕。以上两个问题如不能解决，秋丰白玉品种就难以在生产上大量推广。 相似文献
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秋丰、白玉是中国农业科学院蚕业研究所育成的一对夏秋用蚕品种,其一代杂交种不仅强健好养,产量高,丝质优,且还具有耐氟性能强等优点.1999年该品种占浙江省夏秋出库蚕种的32.8%,占春期出库蚕种的18.3%.杭州蚕种场从1990年开始繁育秋丰、白玉共15期,已掌握该品种的繁育特点,目前已达到稳产高产繁育的水平. 相似文献
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浅谈秋丰×白玉的饲育体会 总被引：2，自引：2，他引：0
选择适合本地区饲养的优良蚕品种是获得蚕茧优质高产关键性措施之一。桐乡市自1996年引进、繁育、推广秋丰、白玉,到2000年该品种已成为本市的当家蚕品种。饲养覆盖率已达到100％。在饲养推广秋丰、白玉的7年中。该品种充分发挥了其优良性状,取得了较好的经济效益,深受广大蚕农的欢迎。同时,在生产实践中摸索出了一套饲养该品种的技术措施。现就如何养好秋丰、白玉蚕品种谈几点体会。 相似文献
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秋丰×白玉是中国农业科学院蚕业研究所章佩祯研究员育成的一对夏秋品种。该品种于1990年分别通过浙江省、国家蚕品种的审定,并开始在生产上繁育、推广,1996年桐乡引进试繁,当时白玉（AB）×秋丰（AB）一代杂交种深受蚕农欢迎。但在繁育和推广初期遇到的问题是：蚕种场,原蚕难养,繁育系数低,克蚁制种量仅4～9张;中系秋丰化性不稳定,生种和再出卵多,日系白玉大肚蛾多,残存卵多;蚕农喜欢养白玉×秋丰,因为秋丰×白玉是限性斑纹,易发蚕病,因而蚕农争养反交（农民称之为白蚕）,而不愿养正交（农民称之为花蚕）。 相似文献
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改良系秋丰白玉在江浙地区饲养量占60％多,现通过在广西地区3批繁育与当地当家品种两广2号比较,该品种适应性比较强,只要选择适当的饲育期,可以在广西繁育,生产成绩略优于对照种,对蚕种的余缺调节意义大.在饲养过程中要严格掌握改良系秋丰白玉的品种性状,精选桑叶,精心饲养,加强消毒防病,做好原蚕生产、制种、蚕种保护和浸酸等阶段的工作,把好技术操作关,以确保生产顺利和安全. 相似文献
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原蚕区雄蚕品种一代杂交种繁育探讨 总被引：1，自引：0，他引：1
雄蚕系列品种在浙江省繁育推广多年,由于该系列品种在繁育过程中的特殊要求,一般选择在专业场场本部饲养,近年来由于专业场场部饲养规模缩小,制约了雄蚕品种在我省的繁育和推广。目前我省饲养的雄蚕一代杂交种有很大一部分是从山东调入的。为解决雄蚕一代杂交种繁育问题,必须探索在原蚕区繁育雄蚕一代杂交种。近年来已有省内多家蚕种繁育单位在原蚕区试繁。海宁市新兴蚕种制造有限责任公司在2009年春期在原蚕区试繁雄蚕杂交种秋华×平30,饲养原种180g,取得初步成功。 相似文献
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<正> 陕蚕二号是我省蚕茧生产蚕品种更新换代中推广的多丝量春用品种,在农村饲养较受欢迎。但由于存在普通种繁育技术问题以及后期死蛹发生较多,克蚁制种量一般在8—13张之间。蚕种生产过不了关,以致在生产中推广不快。近两年我们经过逐步探索其繁育技术并由省蚕研所蚕保室解决了后期死蛹问题,克蚁制种量有所提高。1984年春季在宝鸡胥家村原蚕点饲养原蚕408克蚁量,克蚁制种达到15.16张;1985年春季户县周店原蚕点368.8克 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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