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Arrêt ou maintien de la castration chirurgicale en production porcine biologique : quelles pistes envisageables ?
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Variabilité de la capacité d’adaptation des porcelets au sevrage en agriculture biologique
No full textIn organic farming, piglets at weaning are often heterogeneous in age and weight, and weaning remains a critical period, despite piglets areweaned later than in the conventional system. The heterogeneity isreinforced by a poorly adapted solid diet after weaning. The aim of this pilot study was to establish profiles of piglets with different adaptive strategies at weaning based on body weight, feeding behaviour, and blood indicators. Fifty piglets wereborn from five sows (Landrace x Duroc) and a boar (Large White x Piétrain). On day 10 (d10), solid feed was provided ad libitum. After weaning (d42), piglets had still access to the solid feed and had accessto Wrapped alfalfa roughage, both ad libitum. Piglets were allotted in fivepens of 10 weaned piglets. Piglets were weighed before (d1-10-21-28) and every week after weaning (d42) up to d70. Blood was collected on d42 and d48.Behavioural observations were video-recorded the day after weaning (d43).Despite the late age at weaning, greater concentrations in haptoglobin and dROMwere observed on d48(P< 0.05). Three classes of piglets were identified according to their body weight on d42: Small [5.9-12.4 kg], Medium [12.4-13.9 kg] and Large [14.0-18.4 kg] piglets. The Small piglets spent on average more time (P= 0.006) in the feeding area and had higher (P< 0.05) haptoglobin plasma concentration compared to the Large piglets.Average weight still differed (P< 0.001) between all three categorieson d70showing that the Small piglets did not compensate their low body weight to catch up the larger piglets.Further analyses are currently ongoing for a better characterization of the adaptive profiles
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
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