1,720,959 research outputs found
Genetic parameters of legs defects, performance and carcass traits in broiler chickens
No full textOs defeitos de pernas são decorrentes do rápido crescimento das aves, tornando-se necessário um estudo genético das associações entre essas características. Os objetivos deste estudo foram estimar os parâmetros genéticos para defeitos de pernas por escore visual, discondroplasia tibial, características de desempenho e carcaça, assim como estimar as tendências genéticas, ganho genético potencial e respostas correlacionadas, em uma linhagem de frangos de corte. O banco de dados utilizado neste estudo foi composto por registros de 128.459 aves, com informações de pedigree, manejo, desempenho, qualidades e defeitos de carcaça pertencentes a um rebanho elite de uma linhagem comercial de frangos de corte sob seleção. As características estudadas foram: os pesos vivos do animal aos sete (P7), 30 (P30) e 38 dias de idade (P38), peso ao abate (PA), peso eviscerado (PE), peso de peito (PPEI), peso de pernas (PPER), rendimento de carcaça (RCAR), rendimento de peito em relação ao peso ao abate (RPEI), rendimento de pernas em relação ao peso ao abate (RPER), eficiência alimentar (EFAL), defeito de pernas por escore visual (DPER), discondroplasia tibial (DT) e defeito de pernas total (DPERT). Para as características P7, P30, P38, PA, PE, PPEI, PPER, RCAR, RPEI, RPER, EFAL as análises genéticas foram realizadas pela metodologia dos modelos lineares clássicos, utilizando o método da Máxima Verossimilhança Restrita (REML) sob um modelo animal. Além da metodologia dos modelos lineares clássicos, as análises genéticas para as características DPER, DT e DPERT foram realizadas utilizando modelos lineares generalizados com função de ligação logit, devido à natureza categórica destas características, empregando-se modelo animal e modelo pai, com o método da quasi-verossimilhança penalizada (PQL). As análises foram obtidas utilizando-se o software ASREML®. As estimativas de herdabilidades obtidas para as características estudadas variaram de moderadas a altas, exceto para DT e DPERT, para as quais as estimativas de herdabilidades foram baixas. As estimativas de correlações genéticas entre as características de desempenho e carcaça e defeitos de pernas variaram de moderadas a altas, exceto para DPER e EFAL que apresentaram baixas correlações genéticas com as características de desempenho carcaça. As tendências genéticas para as características de desempenho e carcaça são indicativas que há seleção para características de peso vivo em diferentes idades e de desempenho e carcaça nesta linhagem, diferente do que acontece para as características de DPER, DT e DPERT, para as quais não há seleção evidente nessa linhagem.The legs defects are caused by rapid growth of broilers, therefore it is necessary to study of genetic associations between these traits. The objectives of this study were to estimate genetic parameters for legs defects by visual score, tibial dyschondroplasia, performance and carcass traits, and to estimate the genetic trends, potential genetic gain and correlated response in a broiler line. The database used in this study consisted of records from 128,459 birds, containing pedigree information, management, performance, qualities and defects, of an elite flock from a commercial strain of broiler chickens under selection. The traits studied were: the live weight at seven (P7), 30 (P30) and 38 days old (P38), slaughter weight (PA), carcass weight (PE), breast weight (PPEI), leg weight (PPER), carcass yield (RCAR), breast yield (RPEI), legs yield (RPER), feed efficiency (EFAL), legs defect by visual score (DPER), tibial dyschondroplasia (DT) and legs total defects (DPERT). For the traits P7, P30, P38, PA, PE, PPEI, PPER, RCAR, RPEI, RPER, EFAL statistics and genetic analysis done through classical linear models methodology, using the method of Restricted Maximum Likelihood (REML) under an animal model. Besides the classical linear model methodology, genetic analyzes for the traits DPER, DT and DPERT were done using generalized linear models with logit link, due to the categorical nature of these traits, using an animal and sire models, by the method of penalized quasilikelihood (PQL). Full analyzes were obtained using the ASREML® software. Estimates of heritability obtained for the traits varied from moderate to high, except for DT and DPERT, which heritability were low. Estimates of genetic correlations between performance and carcass traits and leg defects varied from moderate to high, except for DPER and EFAL, which presented low genetic correlations with performance characteristics of the carcass. Genetic trends for performance and carcass characteristics indicate that selection occurs for body weight at different ages and performance and carcass traits in this strain, in a different way to the observed for traits of DPER, DT and DPERT, which no evident selection in this line was observed
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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