Resultado da pesquisa (2)
Termo utilizado na pesquisa Ferreira J.L.M.
#1 - Tristeza parasitária bovina na região sul do Rio Grande do Sul: estudo retrospectivo de 1978-2005
Abstract in English:
ABSTRACT.- Almeida M.B., Tortelli F.P., Riet-Correa B., Ferreira J.L.M., Soares M.P., Farias N.A.R., Riet-Correa F. & Schild A.L. 2006. [Tick fever in southern Brazil: a retrospective study of 1978-2005.] Tristeza parasitária bovina na região sul do Rio Grande do Sul: estudo retrospectivo de 1978-2005. Pesquisa Veterinária Brasileira 26(4):236-242. Laboratório Regional de Diagnóstico, Faculdade de Veterinária, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS 96010-900, Brazil. E-mail: alschild@terra.com.br
A retrospective study of tick fever was made, which occurred from 1978-2005 in southern Rio Grande do Sul in the influence area of the Regional Diagnostic Laboratory of the Federal University of Pelotas. From 4,884 cattle specimens, sent by practitioners or which were from necropsies performed at the Diagnostic Laboratory, 231 (4.7%) were diagnosed as tick fever. Data from 221 of those outbreaks were analyzed. Ninety one (41.1%) outbreaks were caused by Babesia bovis, 11 (4.9%) by Babesia bigemina, and 65 (29.41%) by Anaplasma marginale. In other 33 (14.93%) outbreaks of babesiosis there is no information if the disease was caused by B. bovis or B. bigemina, and 21 (9.5%) outbreaks were caused by mixed infection of A. marginale and B. bovis or B. bigemina. Mean morbidity, mortality, and letality rates in 149 outbreaks were 11.17%, 6.81%, and 70.04%, respectively. Most outbreaks occurred during summer (January-March) and autumn (April-June), mainly in 1 to 3-year-old cattle. Clinical signs were depression, weakness, fallen ears, fever, and weight loss. Low packed cell volume values were always found. Hemoglobinury was observed in babesiosis. Neurological signs characterized by gait alterations, muscular tremors, aggressiveness and falling down with tonic and clonic convulsions were observed in babesiosis by B. bovis. The main gross lesions were anemia, jaundice, splenomegaly, hepatomegaly, yellow liver and cardiac hemorrhages. Hemoglobinury was observed in babesiosis, and congestion of the cerebral cortex in babesiosis by B. bovis. It is concluded that B. bovis is the main agent causing thick fever in southern Rio Grande do Sul. In that region with a cattle population of 2,630,000 heads the annual losses due to tick fever can be estimated in 6,220 cattle or US$ 1,623,000.00. Preventive measures to diminish tick fever losses in the region are necessary.
Abstract in Portuguese:
ABSTRACT.- Almeida M.B., Tortelli F.P., Riet-Correa B., Ferreira J.L.M., Soares M.P., Farias N.A.R., Riet-Correa F. & Schild A.L. 2006. [Tick fever in southern Brazil: a retrospective study of 1978-2005.] Tristeza parasitária bovina na região sul do Rio Grande do Sul: estudo retrospectivo de 1978-2005. Pesquisa Veterinária Brasileira 26(4):236-242. Laboratório Regional de Diagnóstico, Faculdade de Veterinária, Universidade Federal de Pelotas, Campus Universitário s/n, Pelotas, RS 96010-900, Brazil. E-mail: alschild@terra.com.br
A retrospective study of tick fever was made, which occurred from 1978-2005 in southern Rio Grande do Sul in the influence area of the Regional Diagnostic Laboratory of the Federal University of Pelotas. From 4,884 cattle specimens, sent by practitioners or which were from necropsies performed at the Diagnostic Laboratory, 231 (4.7%) were diagnosed as tick fever. Data from 221 of those outbreaks were analyzed. Ninety one (41.1%) outbreaks were caused by Babesia bovis, 11 (4.9%) by Babesia bigemina, and 65 (29.41%) by Anaplasma marginale. In other 33 (14.93%) outbreaks of babesiosis there is no information if the disease was caused by B. bovis or B. bigemina, and 21 (9.5%) outbreaks were caused by mixed infection of A. marginale and B. bovis or B. bigemina. Mean morbidity, mortality, and letality rates in 149 outbreaks were 11.17%, 6.81%, and 70.04%, respectively. Most outbreaks occurred during summer (January-March) and autumn (April-June), mainly in 1 to 3-year-old cattle. Clinical signs were depression, weakness, fallen ears, fever, and weight loss. Low packed cell volume values were always found. Hemoglobinury was observed in babesiosis. Neurological signs characterized by gait alterations, muscular tremors, aggressiveness and falling down with tonic and clonic convulsions were observed in babesiosis by B. bovis. The main gross lesions were anemia, jaundice, splenomegaly, hepatomegaly, yellow liver and cardiac hemorrhages. Hemoglobinury was observed in babesiosis, and congestion of the cerebral cortex in babesiosis by B. bovis. It is concluded that B. bovis is the main agent causing thick fever in southern Rio Grande do Sul. In that region with a cattle population of 2,630,000 heads the annual losses due to tick fever can be estimated in 6,220 cattle or US$ 1,623,000.00. Preventive measures to diminish tick fever losses in the region are necessary.
#2 - Poisoning by Amaranthus spp. (Amaranthaceae) in cattle in southem Brazil
Abstract in English:
Two outbreaks of poisoning by Amaranthus spp. were diagnosed in cattle in southern Brazil in the autumn of 1986. In an outbreak in the county of Dom Pedrito, A. hybridus produced 29 deaths in a herd of 526 cattle of different age and sex. The other, produced by A. blitum, occurred in the county of Pinheiro Machado where 30 of 113 steers died. In both, the animals were introduced in areas severely invaded by Amaranthus at seeding stage. The clinical signs were depression, anorexia, decreased ruminal motility, diarrhoea and incoordination with hipocalcemia, hiperphosphatemia, hiperkalemia and increased serum levels of urea and creatinine. The course of the disease until death was from 3 to 10 days. Macroscopic lesions were characterized by hemorrhages in subcutaneous tissue and serous membranes, ulceration of the oesophagus, congestion, hemorrhages, and in some cases ulceration of abomasum, intestine, larynx and trachea. The kidneys were edematous, with increased consistency and sometimes yellow incolor. In all cases, the main histological lesion was a severe toxic nephrosis. The lesion was reproduced in two steers fed, respectively, 339.88 and 492.25 g per kg body weight of A. hybridus and A. blitum, and afterwards euthanized.
Abstract in Portuguese:
Dois surtos de intoxicação por Amaranthus spp. Foram diagnosticados no Rio Grande do Sul no outono de 1986. Em um surto no município de Dom Pedrito, causado por A. hybridus, morreram 29 animais de um total de 526 bovinos de diversas categorias; no outro surto no município de Pinheiro Machado, causado por A. blitum, morreram 30 novilhos de um total de 113. Nos dois surtos as áreas onde foram colocados os animais estavam severamente invadidas por Amaranthus em período de sementação. Os sinais clínicos caracterizaram-se por depressão, anorexia, diminuição dos movimentos ruminais, diarréia e incoordenação com hipocalcemia, hiperfosfatemia, hiperpotassemia e elevação dos níveis séricos de uréia e creatinina. A evolução da doença até a morte era de 3 a 10 dias. As lesões macroscópicas caracterizaram-se por hemorragias petequiais subcutâneas e das serosas, ulcerações do esôfago e hemorragias, congestão e, em alguns casos, ulcerações do abomaso, intestino, laringe e traquéia. Os rins apresentavam-se com consistência aumentada, edemaciados e cor amarela. A principal lesão histológica foi uma severa nefrose tubular tóxica observada em todos os animais. As lesões de nefrose em grau leve foram reproduzidas experimentalmente em 2 bovinos, alimentados com as plantas coletadas nos locais onde ocorreram os surtos, nas doses de 339,88 e 492,25 g por kg de peso vivo de A. hybridus e A. blitum, respectivamente, e sacrificados posteriormente.
