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Karin Meyer 《Zeitschrift für Tierzüchtung und Züchtungsbiologie》2019,136(4):243-251
Multivariate estimation of genetic parameters involving more than a handful of traits can be afflicted by problems arising through substantial sampling variation. We present a review of underlying causes and proposals to improve estimates, focusing on linear mixed model‐based estimation via restricted maximum likelihood (REML). Both full multivariate analyses and pooling of results from overlapping subsets of traits are considered. It is suggested to impose a penalty on the likelihood designed to reduce sampling variances at the expense of a little additional bias. Simulation results are discussed which demonstrate that this can yield REML estimates that are on average closer to the population values than their unpenalized counterparts. Suitable penalties can be obtained based on assumed prior distributions of selected parameters. Necessary choices of penalty functions and of the stringency of penalization are examined. We argue that scale‐free penalty functions lend themselves to a simple scheme imposing a mild, default penalty which can yield “better” estimates without being likely to incur detrimental effects. 相似文献
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Maxim V. VINARSKI 《Integrative zoology》2020,15(1):2-15
The use of the “integrative approach” for classification of organisms since its formal establishment in 2005 has become a recurrent theme of zoosystematics. A bibliometric survey of the publications on integrative taxonomy of animals, which is aimed at exploring the most popular areas of research and characterizing the practical systematists’ attitudes to this new approach, is presented. An analysis of 582 papers, which appeared between 2005 and 2017 in journals indexed by Scopus and the Web of Science Core Collection, has illustrated the gradual growth of the popularity of integrative taxonomy as well as some biases in the representation of higher taxa in “integrated” studies. It has been shown that the “integrative” papers have more chance of appearing in a top‐ranking journal and gain relatively more citations as compared with non‐integrative papers. The obtained results are discussed in the context of the “taxonomic impediment” problem thought to be a consequence of the institutional crisis of traditional taxonomy, which has been vividly debated over the past decades. 相似文献
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鸡新城疫是危害养鸡业的主要疾病之一。但血凝和血凝抑制（HA-HI）试验中使用的新鲜鸡红细胞保存时间短，洗涤制备需仪器。本试验通过对红细胞醛化使其保存期延长，并对抗原稳定性初步研究，借此建立一种操作简单的新城疫诊断试剂盒。研究结果报告如下。 相似文献
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《国外畜牧学(猪与禽)》2014,(5):76-77
<正>1什么是HSE管理体系HSE管理体系是从20世纪80年代后期发展起来的关于健康(Health)、安全(Safety)和环境(Environment管理体系的简称,是将组织实施健康、安全与环境管理的组织机构、职责、做法、程序、过程和资源等要素有机构成的整体,这些要素通过先进、科学、系统的运行模式有机地融合在一起,相互关联、相互作用,形成动态的管理体系。说到底,HSE就是企业中,员工与设备的保障,同时也是企业对外部社会的承诺。健康对我们员工来说是指身体上没有疾病,在心理上(精神上)保持一种完好的状态;对企业来说,就是指在企业中的所有体系,即财务体系、销售体系、产品质量体系等符合企业所在地的法律法规的要求。 相似文献
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从5月9日到6月7日．共收到个人发送简历44份(兽医相关)．企业提供招聘职位174个(兽医相关)。目前主要求职人员为应届毕业生．企业提供的职位大多是业务代表和技术服务，这需要毕业生正确面对。 相似文献
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;周口师范学院计科系,周口师范学院计科系 河南周口466000,河南周口466000Flash;;Perl CGI;;电子邮件使用Flash技术正日益成为多媒体开发中的一种趋势,而采用Flash技术制作网站也逐步成为主流。文中介绍了一种结合Flash组件技术和动态网页开发语言Perl CGI开发一个利用邮件服务器在线发送电子邮件的方法。0科技信息Scien 相似文献