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2006年美国大陆有惊人数量的蜜蜂群死亡.随后的调查推测,这种不明原因的蜂群消失至少在最近两年是养蜂人经历过的.到2007年春季全美国有20多个州报道了蜜蜂灾难性的损失.蜜蜂飞出去采集花粉和花蜜,却神秘地不再返回蜂巢,目前还查不出原因.这种情况经过媒体的报道,特别是在万维网上迅速的传播(到2007年7月上旬"谷歌"网上已有621 000项关于蜜蜂神秘失踪的报道),引起了世界各国的科学家、养蜂企业和农场主的关怀. 相似文献
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谢银禄 《畜牧兽医科技信息》2008,(3):13
在建设社会主义新农村时期,利用科学技术发展现代畜牧业,提高生产效率,是新时期赋予畜牧兽医工作者的一项重要的历史使命.随着国民经济水平的不断提高,大格勒乡养猪业由传统"养猪为过年"落后的状态,开始面向市场.但转型的养猪业还不具备一定的经济规模和系统科学的饲养管理程序,以及必要的市场流通渠道,极易遭受市场经济规律无情的淘汰.笔者就大格勒乡养猪业通过多年的调查研究,浅析大格勒乡养猪业存在的问题,以供广大的同仁和养猪户借鉴. 相似文献
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国家蜂蜜新标准GB18796-2005的实施对治理混乱的蜂蜜市场意义重大,但标准的实施不仅存在着执行的困惑,而且存在着缺陷,主要是没有面对我国养蜂生产和产品加工的实际,没有处理好养蜂生产者、生产经营者和行业长期利益的关系,与国际标准还存在一定差距,是企业标准行业化的垄断。中国已经加入WTO六年,随着世界经济文化的一体化,蜂蜜的标准不仅是中国的,也是世界的。本文就标准存在的缺陷提出一些看法,以期能起到抛砖引玉,促进我国蜂蜜标准更为科学和合理的修订。 相似文献
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随着养禽业的发展,疾病也在不断地变化.为防治各种疾病的发生,投药是不可避免的,但如果投药的方法不当(如剂量过大或用药时间过长),则会引起药物中毒,严重影响鸡的健康和生产性能,甚至造成大批死亡,给养鸡业造成不应有的损失.现就鸡常用药物中毒的原因及其预防措施简述如下. 相似文献
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七月,火红的季节,勾起人们无限的追忆与遐想。当南湖红船的誓言冲破华夏大地的阴霾,当遵义会议毛泽东思想成为行路的指南,当春天的故事唱响十三亿人民走进新时代的诗篇,当和平崛起的 相似文献
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导读:用禽流感病毒疫苗给家禽进行免疫接种是预防禽流感发生与传播的主要措施.但是,用疫苗进行免疫接种可能不会使病毒的复制和排泄停止,并且对在免疫接种的鸡群中特别是在集约化生产方式的鸡群中可能出现毒力更强的病原体.文章特别指出,当前,用行政手段强行取缔小规模的家禽生产被认为是既不现实也不适宜的. 相似文献
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记:对于一个规模化的猪场来说,贵场今年的养猪效益怎么样? 张:还不错.虽然今年广东地区也属于高致病性猪蓝耳病的暴发区,但对于规模化的猪场来说,受到的影响较小.今年的整体行情很好,根据各规模猪场的情况不同,养猪利润稍有差异,大概每头猪在200～300元,中小户的利润更高些,有许多养猪企业和养猪户是赚了钱的.但对整个行业来说,今年整体赚的钱不会比往年多,因为猪出栏量减少的程度比较严重. 相似文献
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在季节交替的时候,由于气温起伏较大,长期患有高血压、高血脂的老年人极易诱发脑血管病.所以应注意以下几点: 1.患有高血压病、心脏病、短暂性脑缺血、动脉硬化等疾病的人群应引起高度重视,并在医生的指导下进行正规的、长期的治疗和观察,同时服用蜂产品制剂. 相似文献
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鉴别现有PRRS(猪繁殖与呼吸综合征)病毒基因 型的工作是瑞典2007年流行病研究的重要内容.在德 国,从1990年首次暴发PRRS起,PRRS就成了地方病.汉诺威的兽医大学与英特威国际公司合作,测定从下 萨克森郡(该国养猪密度最大的地区)分离到的病毒 株类型发现,2004-2007年问病例分离出的病毒类型 关系密切,大多形成了具有自身特征的族群,与其它欧洲国家的PRRs病毒毒株类型不同. 相似文献
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魏静 《四川畜牧兽医学院学报》2009,(4):28-32
在现代法律秩序中,商会自治规范是制定法的基础和必要的补充,甚至在某些方面替代了制定法;商会自治规范主要包括商会组织规范、行为规范、惩罚规范以及争端解决规范等;其效力仅及于其内部成员;商会自治规范和制定法之间存在冲突,但也存在整合的基础。 相似文献
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本文概述了猪的毛色类型、猪的毛色遗传模式,着重综述了猪毛色基因分子基础的研究进展,指出存在问题并就未来发展方向做了思考。 相似文献
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以国际标准强毒Ｒ株人工感染非免疫产蛋鸡,定时扑杀,分别从鼻窦、眶下孔、气管、肺、气囊、卵巢和输卵管分离ＭＧ,并收集感染鸡所产蛋分离ＭＧ。结果表明,人工感染４８小时后上、下呼吸道及肺已被全面感染,９６小时气囊已被感染,１２０小时输卵管已能分离到ＭＧ,卵巢始终分离不到ＭＧ。人工感染鸡自１４４小时便能在其所产蛋中分离出ＭＧ。药物治疗能在７２小时内消除感染,油乳剂苗则需２４天后逐渐降低蛋内ＭＧ分离率,药物卵内注射、种蛋药浴、高温处理均能杀死卵内ＭＧ,但以研制的种蛋浸泡剂药浴效果为最好。 相似文献
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REASONS FOR PERFORMING STUDY: Centesis of the bicipital bursa using an 8.9 cm long spinal needle has been reported but the alternative of employing a 3.8 cm long hypodermic needle requires validation. OBJECTIVE: To compare the efficacy of 2 different methods of centesis of the bicipital bursa and to evaluate the usefulness of ultrasonographic imaging to determine the location of solution administered when centesis of the bursa is attempted. METHODS: For Trial 1, 6 clinicians, who had no previous experience of centesis of the bicipital bursa, attempted to inject a solution composed of an aqueous radiopaque contrast medium and physiological saline solution (PSS) into the bicipital bursae of 2/12 horses using the previously described distal approach to inject one bursa and a proximal approach to inject the contralateral bursa. The bicipital tendon and bursa were examined ultrasonographically before and after injection; and both shoulders were examined radiographically to identify the location of the medium. In Trial 2, another 6 clinicians, also with no previous experience of centesis, repeated Trial 1, using 6 horses, but the radiopaque contrast medium was mixed with air instead of PSS. RESULTS: Accuracy of centesis using the proximal approach was 39% and that of the distal approach 28%. Ultrasonographic examination of the shoulder allowed the location of solution and air to be accurately predicted in all 12 shoulders examined. CONCLUSIONS: Clinicians who have had no previous experience performing centesis of the bicipital bursa are unlikely to be successful in centesis using either approach. Radiographic examination after injecting a radiopaque contrast medium may be necessary to assess the success of centesis especially if bursal fluid is not obtained during centesis. Injecting air along with the radiopaque contrast medium provides more accurate ultrasonographic confirmation of centesis and better radiographic definition than does injection without air. 相似文献
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Effects of size of ingestively masticated fragments of plant tissues on kinetics of digestion of NDF
Ingestively masticated fragments were collected and sized via sieving. Different sizes of esophageal masticate and ruminal digesta fragments, and ground fragments of larger masticated pieces were incubated in vitro, and undigested NDF remaining at intervals of up to 168 h of incubation was determined. The ruminal age-dependent time delay (tau) for onset of digestion of NDF was positively correlated (P < 0.004) with the mean sieve aperture estimated to retain 50% of the fragments between successive sieve apertures (MRA). Degradation rate of potentially degradable NDF (PDF) and level of indigestible NDF were not related (P > 0.10) to MRA of masticated and ground fragments. Estimates of tau were positively related to MRA, with slopes of bermudagrass < corn silage < ruminal fragments of corn silage. It was concluded that fragment size-, and consequently, ruminal age-dependent onset of PDF degradation of a mixture of different fragment sizes results in an age-dependent rate of degradation of the more rapidly degrading of two subentities of PDF. Models are proposed that assume a tau before onset of simultaneous degradation of PDF from two pools characterized as having gamma-modeled age-dependency and age-constant rates. The ruminal age-dependent pool seems to be associated with the faster-degrading pool, and its rate parameter increases with range in MRA in the population of fragments. Conceptually, the ruminal age-dependent rate parameter for PDF degradation seems to represent a composite of several effects: 1) effects of the size-dependent tau; 2) range in MRA of the population of ingestively masticated fragments; and 3) subentities of PDF that degrade via more rapid age-dependent rates compared with subentities of PDF that degrade via age-constant rates. The estimated fractional rates of ruminative comminution of ingestively masticated fragments (0.060 to 0.075/h) were of a magnitude similar to the mean fractional rates of PDF digestion (0.030 to 0.085/h), which implies that ruminative comminution may be first-limiting to fractional rate of PDF digestion. The in vivo roles of ingestive and ruminative mastication of fragments on PDF degradation must be considered in any kinetic system for estimating PDF digestion in the rumen. These results and others in the literature suggest that the rate of surface area exposure rather than intrinsic chemical attributes of PDF may be first-limiting to degradation rate of PDF in vivo. 相似文献