| neosporosis as a cause of abortion in dairy cattle in rio grande do sul, southern brazil. | forty-six aborted bovine fetuses submitted to the faculty of veterinary, department of clinical pathology, universidade federal do rio grande do sul, were examined histopathologically. non-suppurative inflammation was observed mainly in the brain and heart of 22 fetuses. brain lesions consisted primarily of mononuclear inflammatory cell infiltrates with occasional foci of necrosis. protozoa that reacted with neospora caninum antisera were seen in 18 of the 22 (81.8%) brain specimens from fetuses ... | 2002 | 11750112 |
| virulence markers and serotypes of shiga toxin-producing escherichia coli, isolated from cattle in rio grande do sul, brazil. | to determine the prevalence of shiga toxin-producing escherichia coli (stec) and serotypes and virulence markers of the stec isolates from beef and dairy cattle in rio grande do sul, brazil. | 2007 | 17397481 |
| re-emergence of chorioptes bovis (acari: psoroptidae) in cattle in the state of rio grande do sul, brazil. | here we describe an outbreak of chorioptic mange in cattle, 56 years after its first identification in brazil. between the months of june and july 2011, dermatitis characterized by alopecia and crusted and thickened skin at the insertion of the tail and in the ischiorectal fossa was recognized in 40 (35.7%) out of 112 holstein cows on a farm in the northeastern mesoregion of the state of rio grande do sul, brazil. after diagnosing mange caused by chorioptes bovis, the cows were weighed and treat ... | 2017 | 25517535 |
| partial selective treatment of rhipicephalus microplus and breed resistance variation in beef cows in rio grande do sul, brazil. | rhipicephalus microplus infestation causes heavy losses in cattle. the majority of farmers control the cattle tick by using long-acting drugs throughout the year, which evidently increases selection pressure for drug resistance. partial selective treatment (pst) may be used to directly reduce selection pressure by treating only the portion of the herd that is most infested. the objective of this work was to determine the effect of pst in two herds of beef cows and the effect of breed tolerance. ... | 2013 | 23219046 |
| diversity of yeasts from bovine mastitis in southern brazil. | mastitis is one of the most serious problems in the dairy cattle farms. the great majority of the cases are caused by bacteria, but lately there have been an increasing number of reports about cases of mycotic etiology. the objective of this work was to characterize the yeasts and yeast-like fungi associated with milk of cows with mastitis. milk samples (n = 248) from a dairy belt situated around the region of passo fundo, hinterland of the state of rio grande do sul, southern brazil, were analy ... | 2008 | 18785784 |
| larval immersion tests with ivermectin in populations of the cattle tick rhipicephalus (boophilus) microplus (acari: ixodidae) from state of sao paulo, brazil. | larval immersion tests (lit) with commercial formulation of ivermectin were carried out with larvae of two field populations of rhipicephalus (boophilus) microplus from commercial dairy farms of the state of sao paulo, brazil and a susceptible strain (porto alegre) to differentiate resistant-suspected and susceptible strains. one of the populations tested (barra alegre) showed a lc(50) value significantly higher than the susceptible strain and a resistance ratio (ci95%) of 3.78 (3.47-4.12), lead ... | 2006 | 16904265 |
| systemic granulomatous disease in brazilian cattle grazing pasture containing vetch (vicia spp). | vetch associated disease (hairy vetch poisoning) was observed in 8 herds of dairy cows in the state of rio grande do sul, southern brazil. in the pasture where 4 of these 8 herds were, vicia villosa was the only vetch species represented, while cattle in the remaining 4 herds had access to both v villosa and v sativa but with large predominance of the former. observed clinical signs included fever, dramatic drop in milk yield, thickening and wrinkling of the skin with multifocal plaques of alope ... | 2004 | 15080204 |
| hyperthermic syndrome in dairy cattle associated with consumption of ergots of claviceps purpurea in southern brazil. | a hyperthermic syndrome (hs) associated with consumption of ration contaminated with claviceps purpurea is described in 4 dairy cattle herds from different counties in the state of rio grande do sul, southern brazil. outbreaks of this mycotoxicosis occurred during the summer of 1999-2000 and autumn of 2002 when 25% to 70% of cattle from those herds were affected. the disease occurred after the introduction of a new batch of feed contaminated with sclerotia of c. purpurea. first clinical signs we ... | 2003 | 12776790 |