1,720,961 research outputs found
Malattie parassitarie in ruminanti allevati con metodo biologico in Veneto
Full text linkIn the last years, the consumers’ sensitivity to the quality of both animal products and production process has increased, inducing the quest of breeding methods more respectful of environment benefits and animal welfare. The Italian legislation on organic farms (Reg. CE 834/2007 and Reg. CE 889/2008) provide for specific measures of breeding and a maximum of 2 antiparasitic treatments/year with synthetic drugs. This survey arose from the necessity to control parasitic diseases in ruminants bred in organic farms of the Veneto region, and to assess the efficacy of alternative methods for controlling parasites. A total of 28 (14 cattle, 11 goats, 3 ovine) farms and 776 individual fecal samples (449 goats, 97 ovine, 230 cattle) were analysed by qualitative (prevalence: 85.2% cattle; 97.7% goats; 90.7% ovine) and quantitative coprological tests. In general terms, the use of pasture is a risk factor for gastrointestinal strongyles, with a peak of prevalence during autumn; other factors as breed, altitude and different kinds of treatment don’t seem to influence the parasitological situation. No farms were positive for the presence of bronchopulmonary strongyles and ectoparasites. During this survey, 72 bovine blood samples were collected and tested by indirect immunoflorescence (73.9% and 8.2% positive sera to Babesia bovis and B. bigemina, respectively) and PCR (all negative blood coagula). Moreover, copromicroscopic detection of Fasciola hepatica eggs in a dairy farm was confirmed by the presence of adult parasites found in 6/11 (54.5%) calf livers. Finally, a trial was carried out in a goat farm to evaluate the efficacy of a commercial phytotherapic (Privirum - GreenVet) against nematode parasites (FECR <80%). On the basis of these results, the parasitic situation don’t seem to be worrying in the investigated organic farms; nevertheless, it needs a continuous monitoring and control. Further studies are required to evaluate the real efficacy of non-conventional treatments, because in force legislation strongly suggest to use them.Negli ultimi anni, la sensibilità dei consumatori non solo verso la qualità dei prodotti di origine animale ma anche dell’intero processo produttivo, ha determinato l’esigenza di dirigere l’allevamento verso tecniche sempre più rispettose dell’ambiente e del benessere animale; per questo motivo l’interesse per allevamenti zootecnici di tipo biologico è andato aumentando. La normativa italiana per l’allevamento biologico (Reg. CE 834/2007 e Reg. CE 889/2008) prevede specifiche misure di allevamento e un massimo di due trattamenti antiparassitari annui con farmaci di sintesi. Questo studio è nato dalla necessità di verificare la situazione parassitaria negli allevamenti biologici di ruminanti in Veneto e di valutare l’efficacia di metodi alternativi nel controllo delle parassitosi. In totale sono stati indagati 28 allevamenti (14 di bovini, 11 di caprini 3 di ovini) e 776 campioni fecali prelevati da altrettanti animali (449 caprini, 97 ovini, 230 bovini). Tutti i campioni sono stati analizzati mediante esame coprologico qualitativo (positività: 85,2% nei bovini; 97,7% nei caprini; 90,7% negli ovini) e quantitativo. In generale, l’uso del pascolo risulta essere un fattore di rischio per gli strongili gastro-intestinali, con un incremento dei valori di prevalenza nel periodo autunnale. ;Altri fattori quali razza, altitudine e differenti tipi di trattamento non sembrano influenzare la situazione parassitaria degli allevamenti. Nessuno degli allevamenti indagati è risultato positivo per strongili bronco-polmonari ed ectoparassiti. Nel corso dell’indagine sono stati prelevati 72 campioni di sangue bovino per la ricerca di Babesia spp. mediante test di immunofluorescenza indiretta (sieropositività del 73,9% per Babesia bovis e dell’8,2% per B. bigemina) e PCR (su coaugoli risultati tutti negativi). Inoltre sono stati esaminati 11 fegati di vitelli, provenienti da un allevamento positivo per Fasciola hepatica agli accertamenti coprologici, individuando la presenza di parassiti adulti in 6 (54,5%) fegati. Infine è stata eseguita una prova con un prodotto fitoterapico commerciale (Privirum - GreenVet) in un allevamento di capre per valutarne l’efficacia contro i nematodi (FECR <80%). Dall’indagine è emerso che le parassitosi non sono un problema particolarmente sentito dagli allevatori. Sebbene la situazione parassitaria riscontrata negli allevamenti indagati non sembri preoccupante, essa necessita di un continuo monitoraggio e, in alcuni casi, di indispensabili misure di controllo. Ulteriori indagini devono essere eseguite al fine di valutare la reale efficacia di trattamenti non convenzionali, considerato che la normativa attualmente in vigore ne consiglia l’us
Sarcocystis spp. (Apicomplexa) in brain and muscle tissue of a Testudo hermanni boettgeri: first report in Italy
No full textBlood parasites in Turdidae of North East Italy, with emphasis on the role of Plasmodium spp.
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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
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