Estudo da etiologia das principais bactérias isoladas de mastite bovina em rebanhos leiteiros de propriedades rurais de Goiás
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Data
2012-03-02
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Universidade Federal de Goiás
Resumo
The bovine mastitis consists of an inflammation of the mammary gland, with
acute to chronic evolution, which occurs when an infectious agent attacks the
mammary gland. It is characterized by physical, chemical and sensory
alterations of the milk, caused by microorganisms that invade the mammary
gland and cause pathological changes in the glandular tissue. Mastitis can be
classified according to the form of presentation as clinical or subclinical. Several
symptoms are observed in the clinical form of the disease such as the secretion
of milk with lumps, pus or watery aspect, and edemaciated stiff and febrile teats
and udder. On the other hand, no symptoms can be observed in the mammary
gland and milk in subclinical cases. Mastitis is a major cause of economic
losses in dairy cattle farms, mainly due to reduced milk production, changes in
the composition and increased somatic cell count (CCS). The objective of this
study was to evaluate the prevalence of the main bacteria that cause (clinical
and subclinical) bovine mastitis, and to check the sensitivity to various
antimicrobial agents of clinical mastitis. The agents most frequently isolated
from clinical mastitis were Streptococcus uberis and Staphylococcus aureus
and the antibiogram demonstrated greater sensitivity and efficacy of the active
principles linezolid, amikacin, gentamicin and imipenen regarding the isolated
agents. In subclinical mastitis Streptococcus agalactiae, Streptococcus uberis
and Staphylococcus sp. Were the agents most frequently identified and that
determined the highest mean values of CCS. The average CCS of cows with
subclinical mastitis was approximately 743 x 103 cs/mL. The study was
conducted in eight dairy farms in the State of Goiás. The results were obtained
by frequency analysis. In conclusion, that the results emphasize the importance
of assessing the sensitivity profile of microorganisms that cause clinical mastitis
in each herd studied allowing greater precision in medication prescription for
future cases of clinical mastitis and for dry cow therapy. The use of other
techniques such as real time PCR is also important for the detection of the main
microorganisms causin subclinical mastitis, which can be indicated as a routine
method, due to its specificity, providing a precise bacteriological diagnosis.
Descrição
Palavras-chave
mastite bovina , antibiograma , CCS , agentes etiológicos , leite , bovine mastitis , sensitivity , CCS , etiologic agents , milk
Citação
MARTINS, Juliana Dias. Etiology study of the main bacteria isolated from bovine mastitis in dairy cattle farms in the state of Goias. 2012. 102 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2012.