1,720,962 research outputs found
Effect of GnRH administration on pituitary response in buffalo.
No full textThe aim of this study was to verify the pituitary response to a GnRH administration on day 6 post-insemination in buffalo. The trial was carried out in January on 21 pluriparous Italian Mediterranean Buffaloes (DIM=118±50 days). The animals were synchronized by using the Ovsynch-TAI Program (Neglia et al., 2003) and inseminated twice, 16 and 40 hours after the last administration of GnRH. Blood samples were collected just before GnRH administration (time 0 – T0) and 30 minutes (time 1 – T1), 3 hours (time 3 – T3) and 24 hours (time 24 – T24) after administration, in order to determine LH, FSH and E2 levels. The administration of 12 μg of Buserelin acetate (Figure 1) significantly (P<0.01) increased LH and FSH blood levels after 30 minutes (T1) and after 3 hours (T3), lowering to the initial values after 24 hours (T24). Therefore the use of GnRH or its analogous represents a good tool in order to increase P4 levels in buffalo species
I geni del metabolismo lipidico come marcatori candidati nella produzione di prosciutto di San Daniele
No full text
LIVELLI DI CORTISOLO NEL PELO DURANTE IL PERIODO NEONATALE NEL PULEDRO
No full textCortisol is a key hormone in several physiological functions. The aim of this work was to assay cortisol in the hair of foals and verify whether its concentrations changes during the neonatal period. Hair samples were collected from 18 foals at birth and then one and two months later. Cortisol was extracted by methanol and assayed using a RIA method. Mean cortisol concentrations decreased significantly (P<0,001) after birth from 60,39 ± 4,03 pg/mg to 36,62 ± 4,63 pg/mg (at 30 days) and to 16,42 ±2,02 pg/mg (at 60 days). Considering the birth event as the highest physiological stressor for a foal, the cortisol levels found at this stage were used as a reference to calculate percentage cortisol changes in the postnatal period. After one month, one foal presented a 94% reduction in cortisol concentrations, while most foals a decrease from 10% to 66%. After 60 days, mean cortisol levels were 42% lower in all animals. It remains to be explained what factors (environment, physiological conditions, and/or management) are responsible for the persistently high cortisol concentrations in the postnatal period up to two months of age
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
COMPARISON BETWEEN CLOPROSTENOL-INDUCED AND SPONTANEOUS OESTRUS FERTILITY IN DAIRY COWS
No full textA short calving to conception interval is of main importance to achieve high economic efficiency in dairy cow industry. In order to reduce this interval, several hormonal treatments have been put on the market, in which cloprostenol, a synthetic analogue of prostaglandin F-2 alpha (PGF(2 alpha)). The aim of this study was to compare fertility of cloprostenol-induced oestrus to that of spontaneous oestrus in dairy cows. In a group of 525 cows, 280 (treated group) were administered 0.5 mg cloprostenol i.m. after transrectal corpus luteum (CL) detection, and inseminated at detected oestrus during the following week. The other 245 cows (control group) were inseminated during spontaneous oestrus. Whey progesterone concentrations were checked at treatment and at insemination in order to remove from the study cows whose P4 levels indicate a non-functional CL, or a lack of luteolysis respectively. Moreover, cows that were not inseminated due to genital problems were also excluded from this study. Conception (59% vs 54.5%) and calving rates (93.7% vs 93%) were not significantly different between the two groups
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
- …
