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荷兰伊拉兹马斯医学中心Ron Fouchier小组和美国威斯康星大学麦迪逊分校Yoshihiro Kawaoka小组分别在实验室研发出人造致命性禽流感病毒HSNI,由于担心其危害性.美国一个生物安全委员会已要求其保密部分研究细节。 相似文献
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Commercial milking of sheep is a new agricultural industry in the United States starting approximately 30 yr ago. The industry is still small, but it is growing. The majority of the sheep milk is used in the production of specialty cheeses. The United States is the major importer of sheep milk cheeses with 50 to 60% of annual world exports coming to the United States during the past 20 yr. Therefore, there is considerable growth potential for the industry in the United States. The only dairy sheep research flock in North America is located at the Spooner Agricultural Research Station of the University of Wisconsin-Madison. The research program started in 1993 and has been multifaceted; dealing with several areas important to commercial dairy sheep farmers. The East Friesian and Lacaune dairy breeds were compared and introduced to the industry through the research program. Both dairy breeds produced significantly more milk than traditional meat-wool breeds found in the U.S., but the two breeds differed in their production traits. East Friesian-cross ewes produced more lambs and slightly more milk than Lacaune-cross ewes whereas Lacaune-cross ewes produced milk with a higher percentage of fat and protein than East Friesian-cross ewes. Lactation physiology studies have shown that ewes with active corpora lutea have increased milk yields, oxytocin release during milking is required to obtain normal fat percentages in the milk, large udder cisterns of dairy ewes can allow for increased milking intervals, and short daylengths during late pregnancy results in increased milk yield. In the nutrition area, legume-grass pastures and forages with a higher percentage of legume will result in increased milk production. Grazing ewes respond to additional supplementation with increased milk yield, but it is important to match the supplement to the quality of the grazing. Ewes on high quality legume-grass pastures that are high in rumen degradable protein respond with increased milk production to supplements high in energy and/or 相似文献
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《黑龙江畜牧兽医》2006,(6):41-41
第三届中美奶业研讨会暨黑龙江省奶业高层论坛于2006年5月23日在哈尔滨市八一宾馆隆重开幕。黑龙江省畜牧兽医局孙文志副局长、中国农业大学动物科技学院李胜利教授、美国威斯康星大学Babcock研究所Karen Nielsen副所长、黑龙江省发展和改革委员会世行办刘贵成主任到会,出席会议的还有省畜牧兽医局有关处室和黑龙江省畜牧技术服务中心的负责同志。开幕式由李胜利教授主持,省畜牧兽医局副局长孙文志致词并介绍黑龙江省奶业发展情况,Babcock研究所副所长Karen Nielsen、黑龙江省发展和改革委员会世行办主任刘贵成分别致词。开幕式结束后由… 相似文献
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目前,美国大部分奶牛饲养农户都实施全混日粮(TMR)饲喂技术。该项技术诞生于20世纪60年代,是由美国威斯康星大学哈瓦德博士研发出来的。首先在英、美、以色列等国推广应用,后来被引入加拿大、日本、埃及等国家。从1994年美国应用全混日粮(TMR)饲养技术情况看,全混日粮不仅应用于奶牛,也可应用于肉牛。当时这项技术在威斯康星州的普及率达20%~50%,实施牛群检定饲养农户占全州奶牛饲养总户数的50%,饲养100头以上规模的农户占全州饲养户数的75%。到了2002年全混日粮(TMR)饲养技术的普及率达80%以上。华盛顿州规模化饲养率达80%,纽约州高达9… 相似文献
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尼龙有许多功能,现在这种神奇的材料功能上可能又要加上抗菌功能。最近美国威斯康星大学麦迪逊分校的科研人员发现,尼龙能“模仿”细胞被感染时产生的抗菌作用。这种发现可用于制造血管支架、导管等可植入病人体内的生物医学装置,另外还可用于生产抗菌服装。 相似文献
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美国威斯康星大学的Broderick等利用28头处(NDF)和酸性洗涤纤维(ADF)的表观消化率均呈线于泌乳期的经产荷斯坦奶牛进行试验,其中8头装有性下降。当用CS取代日粮中的AS时,对纤维的消化瘤胃瘘管。根据泌乳天数(DIM)将奶牛分成区组,采用和乳脂含量的影响可能是由于瘤胃中pH值波动加随机的7个重复的4×拉丁方试验设计(周期为284剧,并且pH值!6.0的时间延长所致。提高日粮中的d)。观测其日粮中不同比例的苜蓿青贮料(AS)与玉米CS,牛奶中的乳蛋白含量呈线性上升,但蛋白产量没青贮料(CS)对奶牛产奶量、氮利用率、表观消化率以有显著差异。当… 相似文献
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