نتایج جستجو برای: selection indices
تعداد نتایج: 397767 فیلتر نتایج به سال:
In selection index procedure, phenotype and genetic (co)variance matrices of traits are used for calculating different genetic parameters like index coefficients, index variance, genetic gain in selection goal and selection accuracy. Sometimes, it is possible that these matrices become inconsistent or they are not positive, nor definite. In the current study, for investigation of the effect of ...
The most desirable approach to improve characteristics such as yield with polygenic inheritance and genotype × environment interaction, is simultaneous selection using selection index based on related traits. This study was conducted Research Farm of Isfahan University of Technology, to compare selection indices for barley yield improvement under nitrogen stress and non stress conditions, usi...
The most desirable approach to improve characteristics such as yield with polygenic inheritance and genotype × environment interaction, is simultaneous selection using selection index based on related traits. This study was conducted Research Farm of Isfahan University of Technology, to compare selection indices for barley yield improvement under nitrogen stress and non stress conditions, usi...
improvement of one trait on its own will affect the performance of other traits because ofgenotypic correlations between traits. index selection is one of the tools used by plant breedersto overcome this problem. the purpose of this paper is to evaluate selection indices developedfor improving grain yield in rice (oryza sativa l.). forty-nine rice genotypes were cultivated attonekabon rice rese...
One of the most important purpose in breeding program is increasing grain yield per hectare. Using selection indices is the most effective methods of selection for simultaneous improvement of grain yield and related traits, which often have a quantitative inheritance. In this study, 29 rice genotypes (9 parents and 20 progenies) were evaluated. The numbers of filled grains in panicle and panicl...
In addition to learning new knowledge, a system must be able to learn when the knowledge is likely to be applicable. An index is a piece of information which, when identiied in a given situation, triggers the relevant piece of knowledge (or schema) in the system's memory. We discuss the issue of how indices may be learned automatically in the context of a story understanding task, and present a...
In selection index procedure, phenotype and genetic (co)variance matrices of traits are used for calculating different genetic parameters like index coefficients, index variance, genetic gain in selection goal and selection accuracy. Sometimes, it is possible that these matrices become inconsistent or they are not positive, nor definite. In the current study, for investigation of the effect of ...
To understand the different selection procedures used in Germany it is necessary to explain the structure of pig breeding and production. The commercial fattening pigs are either produced by traditional herdbook organisations or by commercial breeding companies. While in Bavaria 90 % of all fattening pigs are single crosses with Pietrain as sire and Landrace as dam, in the northern part of Germ...
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