Zanutto, Silvia
Malattie parassitarie in ruminanti allevati con metodo biologico in Veneto [Tesi di dottorato]

In 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.

In relazione con
VET/06 - Parassitologia e malattie parassitarie degli animali

Tesi di dottorato. | Lingua: | Paese: | BID: TD13053037