Fatores de risco e comparação de técnicas de diagnóstico para campilobacterose genital bovina em touros do município de Presidente Prudente - SP
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Data
2007-08-31
Autores
Giuffrida, Rogério [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Para verificar os fatores de risco e a viabilidade de métodos diagnósticos para a campilobacteriose genital bovina (CGB), amostras prepuciais de touros de 102 rebanhos leiteiros de Presidente Prudente, São Paulo, foram avaliadas por testes bacteriológicos, reação da polimerase em cadeia (PCR) e imunofluorescência direta (IFD). Durante a colheita de lavados prepuciais, um questionário sobre desordens reprodutivas nas fêmeas e condições sanitárias foi aplicado aos proprietários das fazendas. As amostras foram plaqueadas em ágar seletivo de Skirrow, ágar Brucella verde brilhante e ágar tioglicolato com 20% do sangue. As características seletivas dos três sistemas da cultura foram comparadas pela avaliação de escores de densidade de contaminantes bacterianos nas placas e a capacidade de suportar diferentes fontes de contaminantes. A PCR foi conduzida usando seqüências dos nucleotídeos que amplificam um fragmento com 835 pares das bases do DNA ribossomal bacteriano. A IFD foi executada usando o conjugado anti-C. fetus subesp. venerealis marcado com isotiocianato de fluoresceína. Resultados positivos foram obtidos para culturas microbianas, PCR e IFD de 7,8% , 5,8% e 1,9% das fazendas, respectivamente. Detectou-se associação significativa entre touros positivos e rebanhos cujas vacas apresentavam taxas de concepção abaixo de 85% (OR=7,6). A concordância entre a PCR e as culturas bacteriológicas foi considerada ótima (Kappa = 0,847), mas foi pobre entre a IFD e os outros testes. Apenas o ágar seletivo de Skirrow não foi influenciado por contaminantes do lavado prepucial. Conclui-se que a CGB está presente em rebanhos leiteiros de Presidente Prudente, onde é associada com os distúrbios reprodutivos.
To verify the risk factors and viability of diagnostic methods for genital bovine campylobacteriosis (GBC), preputial samples from bulls from 102 dairy herds from Presidente Prudente, São Paulo State, were evaluated using bacteriological tests, polymerase chain reation (PCR) and direct immunofluorescence (DFA). During the preputial sampling, some questions were made about female reproductive disorders and sanitary conditions of the farms. The preputial samples were plated in Skirrowþs agar, Brucella Brilliant green agar and Thioglycolate agar with 20% of blood. The selective characteristic of the three systems of culture was compared by the evaluation of bacterial density scores in the plates and for the capacity to support bacterial contaminants of different sources. The PCR was conducted using sequences of nucleotides that amplify a fragment with 835 pairs of bases of the ribossomal DNA. Direct immunofluorescence was performed using anti-C. fetus subesp. venerealis conjugated with fluorescein isothiocyanate. Positive results were obtained by microbial cultures, PCR and DFA results of 7,8%, 5,8% and 1,9% of the farms, respectively. Statistical association between positive bulls and low fertility of the herd cows was detected (OR= 7,6). The overall agreement between the PCR and bacteriological cultures was excellent (Kappa = 0,847), but poor between DFA and the other tests. The Skirrowþs media was the only that was not influenced by contaminant characteristics of preputial fluid samples. It is concluded that GBC is present in dairy herds from Presidente Prudente, where was associated with reproductive disturbances.
To verify the risk factors and viability of diagnostic methods for genital bovine campylobacteriosis (GBC), preputial samples from bulls from 102 dairy herds from Presidente Prudente, São Paulo State, were evaluated using bacteriological tests, polymerase chain reation (PCR) and direct immunofluorescence (DFA). During the preputial sampling, some questions were made about female reproductive disorders and sanitary conditions of the farms. The preputial samples were plated in Skirrowþs agar, Brucella Brilliant green agar and Thioglycolate agar with 20% of blood. The selective characteristic of the three systems of culture was compared by the evaluation of bacterial density scores in the plates and for the capacity to support bacterial contaminants of different sources. The PCR was conducted using sequences of nucleotides that amplify a fragment with 835 pairs of bases of the ribossomal DNA. Direct immunofluorescence was performed using anti-C. fetus subesp. venerealis conjugated with fluorescein isothiocyanate. Positive results were obtained by microbial cultures, PCR and DFA results of 7,8%, 5,8% and 1,9% of the farms, respectively. Statistical association between positive bulls and low fertility of the herd cows was detected (OR= 7,6). The overall agreement between the PCR and bacteriological cultures was excellent (Kappa = 0,847), but poor between DFA and the other tests. The Skirrowþs media was the only that was not influenced by contaminant characteristics of preputial fluid samples. It is concluded that GBC is present in dairy herds from Presidente Prudente, where was associated with reproductive disturbances.
Descrição
Palavras-chave
Reação em cadeia de polimerase, Bovino, Campylobacter fetus, Presidente Prudente (SP), Saude animal
Como citar
GIUFFRIDA, Rogério. Fatores de risco e comparação de técnicas de diagnóstico para campilobacterose genital bovina em touros do município de Presidente Prudente - SP. 2007. 104 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Medicina Veterinária e Zootecnia, 2007.