Percorrer por autor "Arcaute, Marta Ruiz de"
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- Anaemia in ruminants caused by plant consumptionPublication . Ruiz, Héctor; Lacasta, Delia; Ramos, Juan Jose; Quintas, Helder; Arcaute, Marta Ruiz de; Ramo, Maria Angeles; Villanueva-Saz, Sergio; Ferrer, Luis MiguelPlant toxicology has affected animals throughout evolution. Plants have adapted themselves to the environment. This adaptation has led to the development of defensive strategies to avoid being consumed. Plants have several chemical compounds, which can cause deleterious effects on people or animals that consume them, causing a wide variety of clinical signs. Plants from various latitudes, both cultivated for human and animal feeding or decorative purpose and even wild growth plants are able to generate anaemia in ruminants. Coumarins or ptaquiloside predispose bleeding and haemorrhages, causing a haemorrhagic disease in affected animals. In this group, some important fodder plants, such sweet clover (Genus Melilotus spp.), or other weeds distributed worldwide, such as bracken fern (Pteridium aquilinum) of giant fennel (Ferula communis), are included. On the other hand, sulfur-containing chemicals (e.g., n-propyl disulfate and S-propyl cysteine sulfoxides (SMCOs)) may cause severe direct damage to the erythrocyte and their membrane, leading to their destruction and causing haemolytic anaemia in the animal. This review presents the most frequent intoxication by plants causing anaemia in ruminants. Toxic compounds, clinical signs, diagnosis and possible treatments are also presented.
- Seroprevalence and associated factors of Leishmania infantum in small ruminants in PortugalPublication . Quintas, Hélder; Lebrero, María Eugenia; Jacob-Ferreira, João; Quilez, Pablo; Guallar, David; Coelho, Ana Cláudia; Lacasta, Delia; Marteles-Aragüés, Diana; Ruíz, Héctor; Arcaute, Marta Ruiz de; Cardoso, Luís; Villanueva-Saz, SergioBackground Leishmaniosis is a vector-borne disease caused by Leishmania parasites transmitted by infected phle- botomine sand flies. In the epidemiological study reported here, we investigated exposure to Leishmania infantum in sheep (Ovis aries) and goats (Capra hircus) in mainland Portugal. Methods A cross-sectional serosurvey was conducted in three geographical regions of Portugal (Tras-os-Montes, Centre and South), with sampling in 19 municipalities and 87 localities. Results A total of 2124 small ruminants were tested (1820 sheep and 304 goats). Overall seroprevalence was 21.3% (453/2124; 95% confidence interval [CI] 19.6-23.1), with higher seropositivity in sheep than goats (22.4% vs 15.1%). Univariable analysis showed that ruminant species and reported contact between goats and sheep were statistically associated with seropositivity, but these associations were not detected in the subset of 1851 animals used for mul- tivariable modelling. Rather, multivariable logistic regression analysis (n = 1851) showed that several management and biosecurity factors were linked to an increased risk of infection. Increased odds of infection were observed in non- autochthonous breeds (odds ratio [OR] 2.163), holdings without goat-sheep contact (OR 1.920), high aeration/ventila- tion (OR 1.964), suboptimal drinking fountai n hygiene (OR up to 6.221), biannual versus annual disinfection (OR 2.459) and not using equipment from other farms (OR 2.189). Permanent confinement was protective (OR 0.415). Conclusions These results indicate widespread exposure of Portuguese flocks to L. infantum, highlighting the rel- evance of husbandry practices. Further research is needed to determine whether sheep and goats develop clinical disease and to clarify the implications for animal and public health.