Browsing by Author "Azevedo, Joana"
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- Descrição de um surto de intoxicação por cianobactérias (algas verdes-azuis) em bovinos no AlentejoPublication . Menezes, Carina; Nova, Rita; Vale, Micaela; Azevedo, Joana; Vasconcelos, Vítor; Pinto, CarlosSuspeita de hepatoxicidade provocada por cianotoxinas, num surto de morte súbita em 25 bovinos numa exploração com 54 vacas de carne em Almodôvar, Alentejo.
- Description of an outbreak of cattle intoxication by cyanobacteria (blue-green algae) in the South of PortugalPublication . Menezes, Carina; Nova, Rita; Vale, Micaela; Azevedo, Joana; Vasconcelos, Vítor; Pinto, CarlosIn 2017, 25 cows from a beef herd consisting of 54 healthy animals, with ages between 1.5 to 4 years old, from Aberdeen Angus breed x Charolais were found dead in Almodôvar, Alentejo, in the South of Portugal. They were grazing on a field of stubble for about 3 weeks when they broke the electric fence that bordered the field and had access to stagnant water from a small stream (Ribeira de Oeiras) that run across the herd. All the animals were seen healthy, by the keeper, until 12 a.m. of Sunday August 27th. When they were last observed before the occurrence, they were resting at the shade of trees and bushes surrounding the Oeiras stream. At this time of the year, this is a normal behaviour due to the high temperatures, and it is common for them to engage in grazing activities in the evening, when the temperature begins to decrease. On the next day (the 28th August), at 7 a.m., the keeper encountered 20 cadavers scattered throughout the land and 5 sick cows. The other 29 animals of the group did not show any clinical signs during the following weeks after the occurrence. In the same period, was reported the death of a heron in the Oeiras stream.
- First description of an outbreak of cattle intoxication by cyanobacteria (blue-green algae) in the South of PortugalPublication . Menezes, Carina; Nova, Rita; Vale, Micaela; Azevedo, Joana; Vasconcelos, Vítor; Pinto, CarlosA herd of 53 Angus x Charolais crossbred cows and 1 herd bull grazing a stubble field broke through an electric fence, and gained access to stagnant water from a small river (Ribeira de Oeiras). In less than 19 hours, 20 cows died and 5 were sick with clinical signs of ataxia, recumbence, abdominal distension, opisthotonus, paddling and masticatory movements, frothing at the mouth, and bloody diarrhea. The 5 sick cows later died, and the remaining 29 animals remained healthy. Clinical and pathological findings revealed the presence of hepatic and renal necrosis. In the water samples, several cyanobacterial species were identified, predominantly belonging to the toxic genera Microcystis. Altogether, these observations led to a tentative diagnosis of acute hepatoxicity caused by cyanotoxins. The diagnosis was confirmed by detection of microcystin-LR in the kidney from 1 animal. To our knowledge, this is the first report of microcystin-LR animal poisoning in Portugal.
- Intoxicação por cianobactérias em bovinos: caracterização de um surtoPublication . Menezes, Carina; Nova, Rita; Azevedo, Joana; Vasconcelos, Vítor; Pinto, CarlosSuspeita de hepatoxicidade provocada por cianotoxinas, num surto de morte súbita em 25 bovinos numa exploração com 54 vacas de carne em Almodôvar, Alentejo.