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Implementação de um sistema On Farm Culture em explorações de bovinos leiteiros da ilha Terceira - Resultados preliminares
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Advisor(s)
Abstract(s)
A mastite é a doença com maior impacto económico nas explorações, estando também
associada ao uso frequente de antibióticos. O presente estudo teve como principal objetivo
avaliar o uso do sistema On Farm Culture by Zoetis® (OFC by ZTS) em explorações de bovinos
de aptidão leiteira, localizadas na Ilha Terceira. Este sistema visa auxiliar a tomada de decisão
terapêutica, com base na identificação do agente etiológico in situ, na própria exploração,
restringindo o uso de antibióticos aos casos estritamente necessários e promovendo assim o
seu uso racional.
Foram consideradas 85 amostras de leite provenientes de vacas diagnosticadas com
mastite clínica, de 5 explorações que aceitaram ser incluídas no estudo, bem como de outras
35 explorações que gentilmente cederam amostras colhidas no âmbito da prática clínica. As
amostras foram submetidas ao OFC by ZTS e avaliadas em dois laboratórios utilizados como
referência. Foi feita a caracterização dos isolados, bem como, do seu perfil de sensibilidade
antibiótica.
Das 85 amostras analisadas pelo sistema OFC by ZTS, o género Steptococcus spp. foi o
que obteve maior número de isolados (28,4%). Em relação ao perfil de resistência, destacouse
Staphylococcus aureus com as seguintes percentagens de isolados resistentes à
cefazolina e cloxacilina, 33% e 27%, respetivamente.
Com base nos resultados obtidos, pode inferir-se que o sistema OFC by ZTS apresentou
um potencial de redução de utilização de antibióticos no tratamento das mastites clínicas de
48,8%, uma vez que 16,5% das amostras revelaram apenas crescimento de agentes Gramnegativos
e 32,3% não revelaram qualquer crescimento bacteriano.
Mastitis is considered the one of the most costly disease to dairy cattle farms and the one that implies the highest consumption of antibiotics. The present study had as main objective to evaluate the use of the On Farm Culture by Zoetis® (OFC by ZTS) system in dairy cattle farms located on Terceira island. This system aims to assist in therapeutic decision making, based on the identification of the etiologic agent in situ, in the own farm, restricting the use of antibiotics to the strictly necessary cases. This study analysed a total of 85 milk samples from cows diagnosed with clinical mastitis, from 5 farms that agreed to be included in the study, as well as from 35 other farms that kindly provided samples of clinical practice. The samples were submitted to OFC by ZTS and evaluated in two laboratories used as a reference. The isolates were characterized, as well as their antibiotic sensitivity profile. Of the 85 samples analyzed by OFC by ZTS, the genus Streptococcus spp. was the one that obtained the highest number of isolates (28,4%). Regarding the resistance profile, Staphylococcus aureus stood out with the following percentages of isolates resistant to cefazolin and cloxacillin, 33% and 27%, respectively. Based on the obtained results, it can be inferred that the microbiological culture system here studied could have the potential to reduce the use of antibiotics in the treatment of clinical mastitis by 48,8%, since 16,5% of the samples revealed only growth of Gram negative agents and 32,3% did not show any bacterial growth.
Mastitis is considered the one of the most costly disease to dairy cattle farms and the one that implies the highest consumption of antibiotics. The present study had as main objective to evaluate the use of the On Farm Culture by Zoetis® (OFC by ZTS) system in dairy cattle farms located on Terceira island. This system aims to assist in therapeutic decision making, based on the identification of the etiologic agent in situ, in the own farm, restricting the use of antibiotics to the strictly necessary cases. This study analysed a total of 85 milk samples from cows diagnosed with clinical mastitis, from 5 farms that agreed to be included in the study, as well as from 35 other farms that kindly provided samples of clinical practice. The samples were submitted to OFC by ZTS and evaluated in two laboratories used as a reference. The isolates were characterized, as well as their antibiotic sensitivity profile. Of the 85 samples analyzed by OFC by ZTS, the genus Streptococcus spp. was the one that obtained the highest number of isolates (28,4%). Regarding the resistance profile, Staphylococcus aureus stood out with the following percentages of isolates resistant to cefazolin and cloxacillin, 33% and 27%, respectively. Based on the obtained results, it can be inferred that the microbiological culture system here studied could have the potential to reduce the use of antibiotics in the treatment of clinical mastitis by 48,8%, since 16,5% of the samples revealed only growth of Gram negative agents and 32,3% did not show any bacterial growth.
Description
Keywords
Mastite Bovinos Resistências antimicrobianas On Farm Culture Antibiograma Mastitis Cattle Antimicrobial resistance Antibiogram