Fatores de risco para mastite bovina e avaliação fenotípica de resistência antimicrobiana
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2020-02-28
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Universidade Federal de Goiás
Resumo
Bovine mastitis is the most common disease that causes the most economic losses in dairy
herds around the world. The objective of this study was to evaluate the risk factors for
subclinical mastitis in dairy herds in the State of Goiás, to identify the gram-positive
microorganisms that cause mastitis, as well as their antimicrobial resistance. Milk samples
were collected from 1,034 lactating cows from 27 dairy farms located in the State of Goiás
and analyzes of somatic cell count (SCC), bacterial examination and antimicrobial sensitivity
test were performed. A checklist was applied to each participating property to obtain data on
the animals, the properties and the hygienic and sanitary management of the herds. Risk
factors for mastitis were assessed using a mixed generalized linear model. Of the 27
properties, 11 (40.74%) had SCC of the tank above 500,000 cells/mL, therefore above the
maximum limit established by Brazilian legislation. The prevalence of subclinical mastitis in
herds (SCC> 200,000 cells / mL) was 54.93%. The main risk factors associated with the
occurrence of subclinical mastitis in dairy cows were old age, pendulous udder and advanced
lactation stage. 216 microorganisms were identified, gram-positive cocci. Staphylococcus spp.
(53.10%), particularly S. aureus (30.09%), stood out as one of the most common agents
involved in the etiology of bovine subclinical mastitis, followed by Streptococcus spp.
(22.12%) and Enterococcus sp. (16.81%). The highest rates of antimicrobial resistance were
Staphylococcus aureus to penicillin (76%) and ampicillin (74%), Streptococcus spp. to
neomycin (65.08%), gentamicin (46.03) and tetracycline (43.66%) and Enterococcus spp.
tetracycline (52.38%). Isolates of Streptococcus spp. multiresistant (18.06%).
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Citação
ALMEIDA, T. V. Fatores de risco para mastite bovina e avaliação fenotípica de resistência antimicrobiana. 2020. 81 f. Tese (Doutorado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2020.