Data/hora: 25/04/2024 17:43:38

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	23/05/2018	
Data da última atualização: 	23/05/2018	
Autoria: 	GAETA, N. C.; RIBEIRO, B. L. M.; ALEMÁN, M. A. R.; YOSHIHARA, E.; NASSAR, A. F. C.; MARQUES, L. M.; TIMENETSKY, J.; GREGORY, L.	
Afiliação: 	Natália C. Gaeta; Bruno L. M. Ribeiro; Mario A. R. Alemán; Eidi Yoshihara; Alessandra F. C. Nassar; Lucas M. Marques; Jorge Timenetsky; Lilian Gregory.	
Título: 	Bacterial pathogens of the lower respiratory tract of calves from Brazilian rural settlement herds and their association with clinical signs of bovine respiratory disease.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Pesquisa Veterinária Brasileira, Rio de Janeiro, v. 38, n. 3, p. 374-381, março 2018	
Idioma: 	Inglês	
Notas: 	Título em português: Patógenos bacterianos do trato respiratório inferior de bezerros criados em rebanhos de assentamentos brasileiros e sua associação com os sinais clínicos da doença respiratória dos bovinos.	
Conteúdo: 	Bovine respiratory disease (BRD) is considered the major cause of economic losses in dairy and beef cattle production. The study aimed to detect the most important bacteria related to respiratory disease in tracheobronchial fluid samples of healthy and dairy calves with clinical signs of BRD in Brazilian rural settlements. Hundred and forty-one mongrel dairy calves were randomly selected from 42 family farm dairy herds from Brazilian settlements. Physical examination was performed and calves were classified as healthy (n=100) and BRD (n=41). Tracheobronchial fluid samples were collected. Isolation and molecular detection of Mycoplasma dispar, M. bovis and M. mycoides subsp. mycoides SC besides isolation of other aerobic bacteria were performed. Abnormal lung sounds (crackle/snoring/whistle), mucopurulent/purulent nasal discharge, body temperature >39.5°C and respiratory rate >40 breaths/min were higher in BRD calves compared to healthy calves (P<0.05). Bacillus sp., Staphylococcus intermedius and non-fermentative Gram-negative were the most prevalent bacteria isolated. Non-identified species from Enterobacteriaceae family was higher in BRD calves compared to healthy calves (P<0.05). Mollicutes were isolated in 7.4% of samples and only M. dispar was detected. Mollicutes was associated with purulent/mucopurulent nasal discharge (P=0.017). Pantoea agglomerans was associated to tachypnea (P=0.020), and Streptococcus spp. was associated with hyperthermia. Statistical tendencies were observed to M. dispar and tachypnea (P=0.066), and P. agglomerans and tachycardia (P=0.066). The obtained results describe the microorganisms found in tracheobronchial fluid of calves with BRD in some herds of Brazilian family farming and their relation to clinical signs of BRD. INDEX TERMS: Bacterial pathogens, respiratory tract, calves, Brazil, rural settlement, bovine respiratory disease, BRD, Mycoplasma spp., aerobic bacteria, cattle, clinics.	
Palavras-Chave: 	Bacterial pathogens; Doença respiratória dos bovinos; Patógeno bacteriano; Rural settlement; Trato respiratório inferior.	
Thesagro: 	Assentamento; Bezerro; Bovino.	
Thesaurus Nal: 	Bovine respiratory disease; Brazil; Calves; Cattle; Mycoplasma; Respiratory system.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/177511/1/Bacterial-pathogens-of-the-lower-respiratory.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (62638-1) - UPE - AP - DD -  -  -  - DIS