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Registros recuperados: 3
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A fast and simple assay to quantify bacterial leukotoxin activity Electron. J. Biotechnol.
Oppermann,Tobias; Schwarz,Stefan; Busse,Nadine; Czermak,Peter.
Background: Mannheimia haemolytica is the primary bacterial pathogen in causing bovine respiratory disease with tremendous annual losses in the cattle industry. The leukotoxin from M. haemolytica is the predominant virulence factor. Several leukotoxin activity assays are available but not standardized regarding sample preparation and cell line. Furthermore, these assays suffer from a high standard error, a prolonged time consumption and often complex sample pretreatments, which is important from the bioprocess engineering point of view. Results: Within this study, an activity assay based on the continuous cell line BL3.1 combined with a commercial available adenosine triphosphate viability assay kit was established. The leukotoxin activity was found to be...
Tipo: Journal article Palavras-chave: ATP assay; Bacterial pathogen; Bovine respiratory disease; Cattle industry; Critical parameters; Lipopolysaccharides; Mannheimia haemolytica; Microbial biotechnology; Polymyxin B; Quantification; Virulence.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000600006
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Economic Effects of Bovine Respiratory Disease on Feedlot Cattle during Backgrounding and Finishing Phases AgEcon
Brooks, Kathleen R.; Raper, Kellie Curry; Ward, Clement E.; Holland, Ben P.; Krehbiel, Clint.
This research examines the economic effects of bovine respiratory disease (BRD) on backgrounding and finishing phases of cattle production. This research measures the effectiveness of using serum haptoglobin (Hp) concentration to predict BRD occurrence and the impact of multiple treatments for BRD infection on cattle performance and returns. During the backgrounding phase, 222 heifers were grouped by Hp level. After the backgrounding phase, 193 heifers were then grouped by number of BRD treatments in the finishing phase. Net returns decreased in the backgrounding phase and the combined phases as the number of BRD treatments increased. Hp concentrations had no significant effects on net returns.
Tipo: Conference Paper or Presentation Palavras-chave: Bovine respiratory disease; Haptoglobin; Net returns; Livestock Production/Industries; Production Economics.
Ano: 2008 URL: http://purl.umn.edu/45849
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Tissue tropism in host transcriptional response to members of the bovine respiratory disease complex. Repositório Alice
BEHURA, S. K.; TIZIOTO, P. C.; KIM, J.; GRUPIONI, N. V.; SEABURY, C. M.; SCHNABEL, R. D.; GERSHWIN, L. J.; VAN EEnenNAAM, A. L.; TOAF-FROSENSTEIN, R.; NEIBERGS, H. L.; REGITANO, L. C. de A.; TAYLOR, J. F..
Bovine respiratory disease (BRD) is the most common infectious disease of beef and dairy cattle and is characterized by a complex infectious etiology that includes a variety of viral and bacterial pathogens. We examined the global changes in mRNA abundance in healthy lung and lung lesions and in the lymphoid tissues bronchial lymph node, retropharyngeal lymph node, nasopharyngeal lymph node and pharyngeal tonsil collected at the peak of clinical disease from beef cattle experimentally challenged with either bovine respiratory syncytial virus, infectious bovine rhinotracheitis, bovine viral diarrhea virus, Mannheimia haemolytica or Mycoplasma bovis. We identified signatures of tissue-specific transcriptional responses indicative of tropism in the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: MRNA; Bovinos de corte; BRD; Doença Respiratória; Gado de Corte; Beef cattle; Bovine respiratory disease.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1106292
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