水貂细菌性疾病的病原学调查     

曹荣峰  田洪宇  王继芳  苏振渝 《经济动物学报》2008,12(1):21-23

为调查山东省水貂常发细菌病的病原学资料,分别对患病水貂进行了病理剖检、细菌的纯培养和生化鉴定。经分离鉴定确定致病菌的种类为变形杆菌、大肠杆菌、沙门氏菌、克雷伯氏菌、耶尔森氏菌、葡萄球菌和绿脓杆菌,并对水貂细菌病的发病原因和规律进行了探讨。  相似文献   

Trapping for mink control and water vole survival: Identifying key criteria using a spatially explicit individual based model     

Laura Bonesi  Steve P. Rushton 《Biological conservation》2007,136(4):636-650

Introduced alien species are the second most important threat to global biodiversity after habitat loss. The American mink Mustela vison has been introduced to several countries and is threatening a number of native species worldwide. We developed a spatially explicit and individual based model as a planning tool to identify key criteria for the implementation of trapping campaigns as a way to control open American mink populations. We first predicted the minimum effort required to reduce populations of mink below a certain threshold and the best time of year in which to trap mink to minimise their numbers. We then employed this methodology to predict the best trapping strategy to ensure the long-term survival of the water vole Arvicola terrestris, one of the species most endangered by the spread of the mink in the UK. We also applied the mink and water vole population models to rationalise a set of observed data in an area of 50 × 30 km in the Upper Thames (UK). The model predicted that it is necessary to remove mink for at least 3 months every year and that a mixed strategy of trapping during the mating, late dispersal and winter seasons is best for keeping mink at low densities. Concentrating trapping during the late dispersal and winter seasons is instead best for ensuring the long-term survival of water voles. Targeting immigrating juvenile mink as well as reproductive adults is important. The model also showed that trapping efficiency might be an important factor to consider when choosing periods in which to trap.  相似文献   

育成貂生长指标及其相互关系的研究     

袁德智  葛权松  王永忠  孔庆洪 《扬州大学学报(农业与生命科学版)》1992,(1)

106头美洲水貂的后裔,根据性别分别测定其2.5、4,5、6.5月龄和屠宰取皮时的体长、胸围、体重及屠宰后肠道和楦皮的长度.结果表明育成貂的生长存在性别间的显著差异,公貂快于母貂(p<0.01).生长的最强时间在2.5～4.5月龄.随着水貂日龄的增长,体躯指数逐渐增加,体长与植皮长的相关程度也越来越高.体长、胸围与体重之间的相关系数分别为:公貂 0.7529和 0.6358,母貂 0.6606和0.5203。  相似文献   

犬瘟热病毒水貂分离株F基因真核表达载体的构建与表达     

苏凤艳  宗春苗  王卓聪 《西北农林科技大学学报(自然科学版)》2007,35(8):24-28

为了构建犬瘟热病毒F基因真核表达载体,利用RT-PCR方法扩增出水貂源犬瘟热病毒分离株的F基因,将其克隆至pMD-18T载体上,用BamHⅠ和KpnⅠ进行双酶切,回收目的基因。将目的基因亚克隆至pcD-NA3.1(+)中,获得真核重组质粒pcDNA3.1-CDVF。通过脂质体介导法将pcDNA3.1-CDVF转染至BHK-21细胞中,并利用间接免疫荧光试验和RT-PCR法检测pcDNA3.1-CDVF在BHK-21细胞中的表达情况。结果表明,真核重组表达质粒pcDNA3.1-CDVF构建成功,F基因可在BHK-21细胞中表达。  相似文献   

水貂卵母细胞发育过程中脂滴的形态学及组织化学变化的研究     

刘玉堂  秦鹏春 《东北农业大学学报》1993,(4)

应用电镜及光镜组织化学技术,对水貂卵巢內各发育阶段卵母细胞中的脂滴进行了研究。在水貂卵母细胞中,脂滴的形成是卵母细胞生长开始的标志之一。在生长早期,卵母细胞中脂滴分散在皮质与核之间的胞质中,且脂滴的染色较深,在晚期阶段,脂滴明显增大,聚集到一起,染色变浅。经油红O和酸性氧化苏木素染色证明,在卵泡腔形成之前,脂滴主要是由中性脂肪和磷脂组成,在卵泡腔形成之后,脂滴成分主要是中性脂肪,磷脂消失。实验结果表明,脂滴可能是来自于相对静止期卵母细胞中分布的黑色嗜锇颗粒(直径约0.38μm),经过脂质的不断蓄积而形成脂滴。脂滴量特别多是水貂成熟卵母细胞的特点之一。  相似文献   

水貂颗粒饲料消化代谢及其对毛皮性状的影响   总被引：2，自引：1，他引：2  

李光玉  杨福合  王凯英  赵靖波  陈之果 《特产研究》2006,28(1):5-8

选取58只母水貂,随机分为两组,分别饲以颗粒饲料和常规鲜饲料,在水貂育成期及冬毛生长期进行饲养试验及消化代谢试验。试验结果表明:饲喂颗粒饲料组水貂和饲喂常规鲜饲料组水貂干物质和有机物质的采食量差异不显著(P>0.05),而蛋白质的消化率和代谢率饲喂常规鲜饲料组均高于饲喂颗粒饲料组(P<0.05)。打皮时饲喂颗粒饲料组和对照组平均体重及体长没有显著差异(P>0.05),试验组和对照组皮下脂肪平均分别为100.65g和111.67g,对照组皮下脂肪比试验组平均多11g左右(P>0.05),两组平均鲜皮长和干皮长差异不显著(P>0.05)。  相似文献   

水貂自咬行为特点及其对管理应激的反应          下载免费PDF全文

孙得发  王建华  徐秀容 《西北农林科技大学学报(自然科学版)》2011,39(4):35-40

[目的]观察水貂自咬行为的特点及发生规律,明确捕捉和转群等管理应激措施对水貂自咬频率和行为呆板症发生率的影响,为水貂自咬症和行为呆板症的发生机制研究提供依据.[方法]随机选择当年断奶的自咬症水貂和临床健康水貂各60只,每组3个重复,每重复20只,公母各半,观察水貂自咬行为的特点及发生规律;通过转群以及连续3 d的模拟捕...  相似文献   

Turning back the tide of American mink invasion at an unprecedented scale through community participation and adaptive management     

Rosalind Bryce  Matthew K. Oliver  Llinos Davies  Helen Gray  Jamie Urquhart  Xavier Lambin 《Biological conservation》2011,(1):575-583

Successful eradications of harmful invasive species have been mostly confined to islands while control programs in mainland areas remain small, uncoordinated and vulnerable to recolonisation. To allow the recovery of threatened native species, innovative management strategies are required to remove invasives from large areas. We took an adaptive approach to achieve large scale eradication of invasive American mink in North East Scotland. The project was centred on the Cairngorms National Park (Scotland), with the primary aim of protecting endangered water vole populations. The project was initiated by scientists and supported and implemented through a partnership comprising a government agency, national park authority and local fisheries boards. Capitalising on the convergent interests of a diverse range of local stakeholders, we created a coordinated coalition of trained volunteers to detect and trap mink. Starting in montane headwaters, we systematically moved down river catchments, deploying mink rafts, an effective detection and trapping platform. Volunteers took increasing responsibility for raft monitoring and mink trapping as the project progressed. Within 3 years, the project removed 376 mink from 10570 km² with the involvement of 186 volunteers. Capture rate within sub-catchments increased with greater connectivity to mink in other sub-catchments and with proximity to the coast where there is more productive habitat. The main factor underpinning the success of this project was functional volunteer participation. The project is a reason for optimism that the tide of invasion can be rolled back on a large scale where the convergent interest of local communities can be harnessed.  相似文献   

Hematological and blood chemical data of pigs fed various amounts of mink manure     

Matti Nsi  Hannu Saloniemi  Kaarlo Kallela 《Acta veterinaria Scandinavica》1978,19(1):84-92

The effect of feeding mink manure to pigs and the utilization of its protein and mineral content was studied by blood analyses. Individual variation was large, and the differences between groups were small. Growth of the animals had a significant effect on the levels of several blood components. Judging from the blood analyses, mink manure feeding did not have any harmful effects on the health of the pigs, and the differences to normal feeding were small.  相似文献   

Preparation of antigen for the counterimmunoelectrophoretic test for plasmacytosis in mink.     

E Brummerstedt 《Acta veterinaria Scandinavica》1976,17(4):395-402

Counterimmunoelectrophoresis as a test method for making the diagnosis of plasmacytosis in mink demands the specific virus antigen. The method for preparation of the antigen according to Cho & Ingram (1972 a, b) with minor modifications is described in details, and results obtained at 62 antigen preparations are presented. In addition an ultrafiltration method is outlined which may be useful as a replacement for ultracentrifugation procedures used in the technique described by Cho & Ingram (1974).  相似文献