1,720,960 research outputs found
Influenza di diete a diverso livello proteico sulle prestazioni produttive di ibridi Pagrus major x Dentex dentex
No full textVengono presentati i risultati dell'impiego di quattro diete, diversificate per l'apporto proteico, sulle prestazioni produttive di ibridi Pagrus major x Dentex dentex
Azione del lievito di birra su alcuni parametri ematochimici del puledro
No full textOtto puledri Quarter Horse, suddivisi in due gruppi con lo stesso peso medio iniziale, sono stati alimentati con 5,5 kg di fieno di festuca e 2,5 kg di concentrati/giorno; la razione del secondo gruppo conteneva 100 g di lievito di birra fosforilato. All’inizio della prova, dopo 30 e 68 giorni i puledri sono stati pesati e sottoposti a prelievo di sangue. Dopo immediata centrifugazione, nel plasma sono stati analizzati ematocrito, proteine totali, albumina, urea, creatinina, Ca, P, Fe, Mg, Cu, Na, K, Cl, AST/GOT, ALT/GPT, g-GT, ALP e a-amilasi. Il consumo di sostanza secca è stato simile nei due gruppi, ma i cavalli che ricevevano lievito hanno fornito un accrescimento ponderale superiore e livelli plasmatici di NEFA più bassi (P<0,05). Inoltre, l’aggiunta di lievito alla dieta di base ha indotto un aumento delle concentrazioni plasmatiche di sodio (P<0,01), calcio (P<0,05) e fosforo, che indica un probabile aumento dell’assorbimento intestinale dei minerali; quale conseguenza a livello metabolico, i livelli di ALP erano più bassi (P<0,05) nei cavalli che ricevevano lievito. I risultati suggeriscono che l’integrazione della dieta con lievito di birra fosforilato può migliorare l’utilizzazione digestiva della fibra e la disponibilità dei minerali, come già rilevato con l’impiego di cellule vive
Estimation of fescue hay intake in horses using the n-alkanes method
No full textThe aim of the work was to evaluate the n-alkane method for measuring forage intake in horses. Four Quarter horses were housed in individual loose boxes and fed with fescue hay and concentrate in three equal feeds at 08.30, 13.00 and 17.00 hrs. After a preliminary period of 12 days, each horse received, for 8 days, 3 g/d of shredded paper impregnated with n-dotriacontane (C32, 209 mg/g), and 3 g/d of shredded paper impregnated with n-hexatriacontane (C36, 164 mg/g), mixed with the concentrate, as external markers. The most present n-alkanes in the forage, n-hentriacontane (C31) and n-tritriacontane (C33), were used as natural markers. Individual faecal samples were collected three times a day. The n-alkane concentrations in the faeces varied widely between days (P<0.001 for C31, C33 and C36; P<0.05 for C32); moreover, dosed n-alkanes did not show the expected enrichment phase during the initial days following marker administration. The variability was reduced when the ratio between natural and dosed n-alkanes was considered, although statistical analysis revealed that only the C31 to C32 ratio did not vary between days. The reduced between-days fluctuation was more evident starting from the 4th day from marker administration; the forage intake was calculated from this day onwards, using individual marker concentration of a single day (day 4), or of pooled days, i.e. the mean value of two (days 4 and 5), three (days 4 to 6), four (days 4 to 7) and five (days 4 to 8) days. The estimated intake was generally lower than the actual amount of forage ingested. The best estimate was obtained with C31/C32 pairs. Increasing the days of sampling from 1 to 4 caused a marked reduction of the standard deviation for all the estimates; only a modest reduction of variability was observed for the further increase of the period to 5 days
Growth response of juvenile dentex (Dentex dentex L.) to varying protein level and protein to lipid ratio in practical diets
No full textThe dentex (Dentex dentex L.) is a fast-growing sparid which represents a possible candidate forMediterranean mariculture. As the basic nutrient requirements of this species are unknown, twofeeding trials were carried out to identify suitable protein and lipid (energy) levels to be used informulating practical diets for dentex. The experiments used groups of 30 specimens (each fishweighing 17 or 20.7 g) which were kept in 12 flow-through 160 1 tanks supplied with seawater at 2 1min-’ (temperature 205 1°C; salinity 33 ppt). An initial 4-week trial was conducted to obtain apreliminary estimate of the optimal protein level. Triplicate groups were fed four practical diets withincreasing levels of protein (44.3,49.3, 55.7 and 58.9% dry matter (DM), over 90% of which wassupplied by white fish meal) and a constant lipid content ( 17.3% DM; mostly supplied by fish lipids)to satiation. An analysis of the nutrient-weight gain relationship indicated that the optimal dietaryprotein level was 49.3% DM. In a second 60 day experiment, duplicate groups of fish were fed sixdiets with three protein levels (44.4,49.5 and 55.8% DM) and two lipid contents ( 12.0 and 17.3%DM) within each protein level, nearly to satiation. Growth performance was lowest in fish given dietscontaining 44.4 or 49.5% protein and 12% lipid and was improved (P<O.O5) either with dietssupplying 55.8% protein (regardless of dietary lipid) or 49.3% protein and 17.4% lipid. The resultsobserved in the second trial suggest that when protein efficiency or retention are considered evendietary levels of 44.3% protein and 17.2% lipid (i.e. 24.3 g protein k.-’ calculated available energy)could be assumed as suitable levels for formulating practical diets for this species, providing highquality fish meal and oil are used
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
Effetto dell’integrazione alimentare sull’utilizzo del pascolo da parte di daini in accrescimento
No full textNei mesi da giugno a ottobre 32 daini maschi di due età (14 e 26 mesi, peso medio iniziale 32,9 e 46,2 kg) sono stati allevati su pascolo di 1 ha, a base di festuca, suddiviso in 2 settori, con o senza integrazione di concentrato (0,5 kg SS/capo/giorno). In ogni settore erano presenti 8 esemplari di ciascuna età.La biomassa pascolabile si è mantenuta costantemente più elevata nel settore con integrazione (118 vs 40 g di SS/m2), dove la crescita dell’erba ha superato l’asportazione e si è verificato un progressivo accumulo di materiale vegetale. Nel settore senza integrazione, i daini hanno complessivamente asportato una quantità di erba maggiore (+58%) e di migliore qualità, per effetto del minor accumulo di materiale senescente, ma il consumo giornaliero è progressivamente diminuito.Tutti gli animali hanno mostrato una flessione di accrescimento da agosto in poi. I daini che ricevevano l’integrazione con concentrato hanno fornito accrescimenti ponderali significativamente più elevati (76 vs 41 g/giorno)
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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