1,720,965 research outputs found
Ultrasonography of the rumen wall as a potencial diagnostic tool to diagnose of Subacute Rumen Acidosis (SARA) in fattening bulls
No full textPrevalence of gastrointestinal, liver and claw disorders in veal calves fed large amounts of solid feed through a cross-sectional study
Full text linkThe impact of the current practice of feeding veal calves with large amounts of solid feed (SF) on the prevalence of specific disorders on rumen, abomasum, liver and claws was investigated through a post-mortem inspection at the abattoir. Forty-one batches (“batch” referred to a group of calves of the same breed, coming from the same farm and belonging to the same slaughter group) of crossbred male calves from dairy breed were randomly inspected at 213.6 days old. On average 16.0 rumens, 15.6 abomasa, 15.1 livers, and 30.5 hind claws were checked per batch. Rumens were evaluated for the presence of hyperkeratosis and plaques; abomasa for the presence of lesions in the pyloric area; livers for the presence of lipidosis, abscess or fibrous adherence; and claws for the presence of sole hemorrhages. More than 60% of rumens per batch had signs of hyperkeratosis and plaques, and 80 to 100% of abomasa per batch showed at least 1 lesion in the pyloric area. On average 24% of livers per batch were diseased and about 65% of claws per batch had sole hemorrhages. Affected abomasa were positively correlated to rumens with plaques. Claws with sole hemorrhages tended to be positively correlated to rumens with hyperkeratosis. Calves of inspected batches were fed 311 ± 31 kg DM/cycle of milk-replacer and 158 ± 44 kg DM/cycle of SF containing more than 85% of corn grain. Based on the recorded prevalence of alterations, this feeding strategy should be reconsidered in order to improve veal calves' welfare
Monitoring Ketosis in dairy cattle: effect of two different therapeutic procedures on some metabolic parameters
No full textA retrospective study on transabdominal ultrasound measurements of the rumen wall thickness to evaluate chronic rumen acidosis in beef cattle
Full text linkBACKGROUND: Chronic and subacute rumen acidosis are economically important in the beef industry. The aim of this study was to evaluate the potential suitability of the transabdominal ultrasonographic examination of the ruminal wall to diagnose chronic rumen acidosis in beef cattle compared to direct measurement of ruminal pH, as a fast non-invasive tool to be used in field condition. Ultrasonographic examination of the rumen was conducted in 478 beef cattle before rumenocentesis (chronic rumen acidosis group = pH ≤ 5.8; healthy group = pH ≥ 5.9). Rumen wall ultrasound measurements included rumen wall thickness (RWT) and rumen mucosa and submucosa thickness (RMST). RESULTS: The Analysis of Variance showed the high significant effect of the pH class for RWT and RMST (P 8.2 mm. The differentiation efficiency of RMST between healthy and chronic rumen acidosis groups, as a result of ROC curve analysis, was good with an AUROC of 0.90: p 5.3 mm. CONCLUSIONS: In this study, the thickening of RWT and RMST is correlated with the changes of ruminal pH. Transabdominal rumen ultrasound has the potential to become a powerful diagnostic tool useful to identify fattening bulls affected by chronic rumen acidosis
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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