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1.
本试验的主要目的在于寻求母狐在不同日期配种和不同的交配时间对受胎率、受配率以及平均产仔数的影响。结果表明,4月上旬受胎率最高,为100%;3月中旬至3月下旬受胎率次之,为7679%,二者差异极显著(P<0.01);而3月上旬和4月中、下旬再次之,分别为66.66%和50%,与3月中、下旬相比差异又极显著(p<001)。受配率则以3月中旬为最高,然后是3月下旬,而3月上旬和4月上、中旬较低。配种日期与平均产仔数无关。对于交配时间,受胎率则以30-60分钟为最高,为82.55%,与不足30分钟和60分钟以上比较差异极显著(p<0.01)。  相似文献   

2.
鱼类人工诱导三倍体和雌核发育二倍体研究进展   总被引:1,自引:0,他引:1  
在育种学上,三倍体(Triploid)与雌核发育(Gyapenesis)的人工诱导都属于“染色体组工程”(Genomeengineeriflg)的范畴。由于它们有控制染色体组和性别的潜力,因此,这些技术正在引起人们的浓厚兴趣。雌核发育和多倍体现象在植物界是相当普遍的,动物界却很少。鱼类系体外受精,产卵量大,所以是研究这一现象的理想材料。1鱼类的天然多倍体和雌核发育现象1.1天然雌核发育的鱼类在鱼类中,最早发现美洲的胎属(poeciliaformosa)(Hubbs,1946)鱼类是行雌核发育的单性鱼类。随后又发现银鲫(Chrassiusauratusgihelio)(蒋一,1982…  相似文献   

3.
取同一种公牛一次采精冷冻的颗粒精液进行不同温度的解冻试验,观察解冻温度对解冻精液品质的影响。实验结果证明,解冻温度对解冻后精子活力、畸形率和顶体完整率有显著性影响(P<0.01),与精子活力和顶体完整率呈正相关(r值分别为0.83和0.94),与精子畸形率呈负相关(r值为-0.97)。解冻温度对解冻后精子存活时间无显著性影响(p>0.05)。在本次实验中,解冻温度以65℃和75℃为最优,显著优于目前普遍采用的38—40℃。  相似文献   

4.
本试验采用大肠埃希氏三价灭活菌苗预防仔猪黄白痢,结果表明:初生仔猪发病率由45.4%降为19.4%(P≤0.01),死亡率由43.5%降为7.5%(P≤0.01),而且0-7日龄仔猪的发病率由31.9%降为2.7%(P≤0.01),治愈率由48.7%上升为85.7%(P≤0.01)  相似文献   

5.
1985-1997年调查了呼盟农区自然条件下核盘菌(Sclerotiniasclerotiorum)的侵染寄主,共发现感病寄生植物127种,分届于25科,89属,其中菊科30种,十字花科11种,豆科14种,葫芦科10种,茄科10种。感病奇主中有农作物13种(占10.2%),牧草4种(占3.1%),盆栽果树2种(占1.6%),野生植物及农田杂草45种(占35.4%)。调查的感病寄生中有14种为国内未报道的新寄主。分析了发病的原因,提出了控制菌核病的综合技术措施。  相似文献   

6.
在本试验的生境和管理条件下,以草地早熟禾(PoaprotensisL.)、高羊茅(FestucaarundinaceaShreb.)和多年生黑麦草(LoliunperenL.)为材料进行了运动场草坪不同草种配比试验,用模糊数学综合评判法对36个组合综合评定.结果表明:建坪第一年苗期状况表现为随多年生黑麦草比例增加其优势越强.成评后草坪质量最优的组合为A24(50%草地早熟禾+30%高羊茅+20%多年生黑麦草),其次为25(40%草地早熟禾+40%高羊茅+20%多年生黑麦草).  相似文献   

7.
测定红细胞沉降率的方法很多,如魏氏法、潘氏法、涅氏法等,所得血沉值亦不同。关于人及多数哺乳动物的红细胞沉降率研究数值已有较多研究,但对于禽类的血沉值却很少有报导。本试验仅采用魏氏法(普通法)以9.8%CaCl2、3.8%柠檬酸钠做抗凝剂测定四种禽的血沉值,为研究禽类血液生理指标和兽医临床提供参考数值及理论依据。1材料与方法1.1试验动物:成年白莱亨鸡,北京鸭,美国白山鸡,白家鸽。1.2药品与试剂无水氯化钙(北京市红星化工厂,批号850521),临用时配制成9.8%CaCl2溶液。柠檬酸三钠(北京市化工厂,批号830719),…  相似文献   

8.
以玉米芯为原料,采用两种不同的饲用菌(A菌和B菌)进行单菌和混合菌发酵,并对菌种进行了筛选。试验结果表明,单菌培养优于混合菌培养,而且B菌在玉米芯上的生长优于A菌,用B菌发酵的产品粗蛋白达11.44%,与底物比差异极显著(P≤0.05)。  相似文献   

9.
沉重的翅膀──关于循化撒拉族女童教育的调查报告(下)马成俊,斯琴,马文全,苏中颖,马宏(二)客观方面的原因1、地理环境的影响循化地区多山多沟,在全县总面积中山岭面积占73.2%,丘陵和河谷平地只占26.8%。撒拉族聚居的六个乡镇位于黄河、街子河、清水...  相似文献   

10.
集热器热性能仿真研究中,数据具有随机性、非线性和不确定性等特点,采用传统方法建模精度不高且复杂。本文介绍了一种基于BP算法的人工神经网络的建模仿真方法,着重阐述了集热器温升和效率及其影响因素,利用MATLAB人工神经网络工具箱的建模仿真过程,最终建立一个精度高迭96.5%人工神经网络模型,为太阳能干燥过程控制提供参考依据。  相似文献   

11.
In August 1999, Jacques Derrida gave a number of lectures and seminars in Melbourne and Sydney. The seminar of 13 August, held at Sydney's Seymour Centre Theatre, was open to the public. It consisted of a question-and-answer session with Genevieve Lloyd, David Wills, Paul Patton and Penelope Deutscher. Its title, 'Themes from Recent Work', reflected interests in the work from Specters of Marx (1994) onwards which some, including Paul Patton, have referred to as deconstruction in its affirmative phase. What follows is a by-no-means verbatim record of the event. Rather it is but one member of the audience's account of what transpired in the seminar – an account which is therefore necessarily selective and pressed through the grid of my own quasi-philosophical interests. Following this account of the seminar, I offer some marginal notes on the open discussion following the seminar, then, finally, some reflections on a particular matter discussed at the dinner which followed that – madness.  相似文献   

12.
As an alternative to the stereotypical mass tourism, independent travellers – travellers who travel for extended periods on low budgets while ostensibly avoiding formalized tourist activities and locales – are invested in constructing ‘authentic’ travel experiences. Practices such as ‘off-the-beaten-track’ travel and cultural engagement provide the means by which independent travellers are able to make claims to such authenticity. Authenticity is constructed by travellers through idealizations of intimacy and non-commodification. These idealizations are tangled in narrative representations of ‘real’ India and ‘real’ Indians, their ‘real’-ness typified by an absence of other travellers, tourists and, more generally, Western contamination. In these ways, ‘authentic’ travel is dependent upon actively constructed binaries of Western travelling subjects and exotic Indian objects. Yet travellers' fantasies of the Other are fragile and subject to collapse at moments in which so-called Others articulate their subjectivity in a way that is inconsistent with travellers' expectations. Through a focus on travellers' narratives of their experience, both the requirement for an Orientalist dichotomy as well as the ruptures that continually challenge this dichotomy, will emerge.  相似文献   

13.
A weaver, seamstress, laundress and artist, in this essay I shall spin a yarn, tangle a web, and construct a text(ile) of the inter-weave of narrative and identity that I define as my intellectual, textual, somatic and material/visual practice obsessions. My work explores ‘the places in-between’ in the entanglements of Irish and Northern Irish gender and identity, and in the abject fabrics of death and of desire. As an Irish feminist, sense-making of the complexities, conundrums, challenges and contradictions of my land, my cloth, my body and my culture owes much to Irish women before me who fought for female suffrage, and Irish women now – north and south of the border that divides the island of Ireland – who still struggle for equality of citizenship, social justice, human rights, and full reproductive autonomy. My contention is that when we accept that Ireland herself is a many-layered cloth, a stained and bloodied cloth, a cloth marked irreversibly by history, conflict, denial and abuse, stained by its own repression, marked through denial of all its people’s rights and needs, and bloodied by its greatest export, the haemorrhage of its people, then – polemical, didactic or reflective, with more compassion, empathy, humility and heart – we just might make peace with our past.  相似文献   

14.
This paper deals with issues of identity, nationalism, postcolonialism, and self-other relations with a focus on a period of transformative events in North Cyprus. It notes how nationalism has been the dominant means of identification for Cypriots in their modern history, and argues that unless weakened and supplanted by a radically pluralist democracy, nationalism imagines one's identity as an indivisible unity and has no place for different others within the nation. However, a pressing relationship with others and otherness is no stranger to Cypriots either, which makes it clear that the border that defines the ‘we’ of such nationalism is, at the same time, the line that divides the self intrinsically, indicating the otherness of the self or its alterity. Subjectivity involves subjection to the other.  相似文献   

15.
文章从历史学、宗教学、民俗学等角度,将流行于黄南藏族自治州同仁县隆务河流域的六月会主体节目之一"玛泽"的文化内涵进行了新的探讨,并就"玛泽"节目的历史和宗教渊源关系,民俗形成过程,以及对军事、生产活动中的意义提出了自己的看法.  相似文献   

16.
本文就三江源自然保护区开发生态旅游产品的可行性及发展潜力,运用SWOT分析模式进行客观分析,并得出三江源开发生态旅游产品是实现该地区可持续发展的最佳途径。  相似文献   

17.
ABSTRACT

Mobility and migration are inherent ingredients of Indonesian cultures. In an archipelago with thousands of islands of various size, character and nature, mobility is an important means to make a living and to survive by migration. The right to free movement in Indonesia is constitutionally granted. It can create mobility and give expression to equal citizenship rights at the same time as it can trigger the enforcement of borders among cultural groups and the ethnification of local and regional politics. Mobility thus always comes along with immobility. Physical mobility of one group of people might cause immobility of another group or it might create cultural and political immobility in the same group. In places such as Eastern Indonesia, people have developed reciprocal means to integrate newcomers. Whereas the immigrants are usually disadvantaged citizens with regards to land and customary rights, those living in the area for generations have nonetheless become integral parts of quite peaceful local settings, one way or the other. The advancement of decentralization, democratization and direct elections of political representatives can lead to political empowerment, the promotion of ethnicity as election capital and changing patterns of belonging. This paper illustrates these ambivalences by looking at mobility in Indonesia more generally and how changing national policies and laws lead to reinterpretations of mobility patterns and trigger changes in relations between local population groups and existing mechanisms of cultural and political inclusion and exclusion. Butonese migrants in Maluku will here serve as a case study.  相似文献   

18.
The use of the categories ‘refugee’ and ‘migrant’ to differentiate between those on the move and the legitimacy, or otherwise, of their claims to international protection has featured strongly during Europe’s ‘migration crisis’ and has been used to justify policies of exclusion and containment. Drawing on interviews with 215 people who crossed the Mediterranean to Greece in 2015, our paper challenges this ‘categorical fetishism’, arguing that the dominant categories fail to capture adequately the complex relationship between political, social and economic drivers of migration or their shifting significance for individuals over time and space. As such it builds upon a substantial body of academic literature demonstrating a disjuncture between conceptual and policy categories and the lived experiences of those on the move. However, the paper is also critical of efforts to foreground or privilege ‘refugees’ over ‘migrants’ arguing that this reinforces rather than challenges the dichotomy’s faulty foundations. Rather those concerned about the use of categories to marginalise and exclude should explicitly engage with the politics of bounding, that is to say, the process by which categories are constructed, the purpose they serve and their consequences, in order to denaturalise their use as a mechanism to distinguish, divide and discriminate.  相似文献   

19.
在"文明间对话"被各国学界极为重视的当代,特别值得关注与研究的是,17-18世纪的回儒学与日本德川儒学之间的具有价值和意义的对话.刘智和伊藤仁斋是同时代不同文化背景的两位思想大师,同时受到朱子学影响,并吸收融合而产生出自己独特的思想体系.本文将探讨这两位思想家对朱子学"理"、"气"思想的重构特色.进一步想说明,不同文化...  相似文献   

20.
Drawing on ethnographic research and employing a micro-historical approach that recognizes not only the transnational but also the culturally specific manifestations of modernity, this article centers on the efforts of a young woman to negotiate shifting and conflicting discourses about what a good life might consist of for a highly educated and high caste Hindu woman living at the margins of a nonetheless globalized world. Newly imaginable worlds in contemporary Mithila, South Asia, structure feeling and action in particularly gendered and classed ways, even as the capacity of individuals to actualize those worlds and the ‘modern’ selves envisioned within them are constrained by both overt and subtle means. In the context of shifting cultural anchors, new practices of silence, literacy, and even behaviors interpreted as ‘mental illness’ may become tactics in an individual's negotiation of conflicting self-representations. The confluence of forces at play in contemporary Mithila, moreover, is creating new structures of feeling that may begin to reverse long-standing locally held assumptions about strong solidarities between natal families and daughters, on the one hand, and weak solidarities between affinal families and new daughters-in-law, on the other.  相似文献   

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