Association of herd-level risk factors and incidence rate of clinical mastitis in 20 Brazilian dairy herds

Tomazi, Tiago; Ferreira, Gabriel C.; Orsi, A; Gonçalves, Juliano Leonel; Ospina, Paula; Nydam, D.V.; Moroni, P.; Santos, Marcos Veiga dos

doi:10.1016/j.prevetmed.2018.10.007

Cited by 42 publications

(43 citation statements)

References 40 publications

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“…Isolates were selected from a collection of bacteria identified during a prospective epidemiological survey evaluating the etiology and risk factors associated with CM in 20 dairy herds of Southeastern Brazil [26]. The overall mean of daily milk production per cow among herds was 22.7 kg (SD = 5.7).…”

Section: Methodsmentioning

confidence: 99%

“…During the aforementioned study [26], milk samples were collected from quarters with abnormal milk, accompanied or not by other clinical symptoms by trained farm personnel using the following procedures: (1) affected teat were dipped in a pre-milking disinfectant solution; (2) after 30 seconds, the teat was wiped with a disposable paper towel; (3) the first 3–4 milk streams were discarded and the teat end was scrubbed using a gauze soaked in alcohol 70%; (4) milk samples were collected into a sterile 15-mL tube. Samples were stored in the farm (approximately -20°C) and transported to the laboratory in isothermal boxes with ice during visits performed by researchers every 14–30 days.…”

Section: Methodsmentioning

confidence: 99%

“…uberis were identified in 4,212 quarter milk samples collected from 5,957 CM cases occurred in 2,637 cows (Table 1). Of cows identified with CM, 48.6% had more than one case of the disease [26]. Microbiological identification was based on the National Mastitis Council guidelines [29].…”

Section: Methodsmentioning

confidence: 99%

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Genotyping and antimicrobial resistance of Streptococcus uberis isolated from bovine clinical mastitis

et al. 2019

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A genotypic characterization of Streptococcus uberis isolated from clinical mastitis (CM) in dairy cows, and the association of Strep. uberis genotypes and antimicrobial susceptibility (AMS) was performed. A total of 89 isolates identified as Strep. uberis from 86 dairy cows with CM in 17 dairy herds of Southeastern Brazil were genotyped using random amplified polymorphic DNA (RAPD) analysis. After genotyping, two clusters (I and II) were created according to RAPD types. A commercial broth microdilution test was used to determine the susceptibility of Strep. uberis isolates to 8 antimicrobials (ampicillin, ceftiofur, cephalothin, erythromycin, penicillin, penicillin+novobiocin, pirlimycin and tetracycline). For each antimicrobial, we determined the minimal inhibitory concentrations that inhibit 50% (MIC50) and 90% (MIC90) of Strep. uberis strains. Differences in AMS among genotypic clusters were evaluated using mixed regression models. Overall, a great polymorphism (56 RAPD-types) was found among Strep. uberis isolates, although a higher genetic similarity (based on the PCR bands features) was observed within herds after genotypic clustering. No differences in AMS were observed among clusters. Strep. uberis isolated from bovine CM were resistant to most antimicrobials, with the exception of cephalothin and penicillin+novobiocin.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Genotyping and antimicrobial resistance of Streptococcus uberis isolated from bovine clinical mastitis

et al. 2019

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“…are the most often reported gram negative, environmental pathogens (described in online Supplementary Table S1). However, CNS and S. aureus were reported more often in North and South American herds than in other continents (Gianneechini et al ., 2002; Olde Riekerink et al ., 2008; Thompson-Crispi et al ., 2013; Levison et al ., 2016; Rowbotham and Ruegg, 2016; Tomazi et al ., 2018). In China, environmental pathogens like E. coli and Klebsiella spp.…”

Section: Effect Of Heat Stress On Mammary Pathophysiologymentioning

confidence: 99%

Effect of heat stress on udder health of dairy cows

Rakib

Zhou

et al. 2020

Journal of Dairy Research

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This Research Reflection short review presents an overview of the effects of heat stress on dairy cattle udder health and discusses existing heat stress mitigation strategies for a better understanding and identification of appropriate abatement plans for future stress management. Due to high ambient temperatures with high relative humidity in summer, dairy cows respond by changes of physical, biochemical and biological pathways to neutralize heat stress resulting in decreased production performance and poorer immunity resulting in an increased incidence of intramammary infections (IMI) and a higher somatic cell count (SCC). In vitro studies on bovine polymorphonuclear cells (PMN) suggested that heat stress reduces the phagocytosis capacity and oxidative burst of PMN and alters the expression of apoptotic genes and miRNA which, together with having a negative effect on the immune system, may explain the increased susceptibility to IMI. Although there are limited data regarding the incidence rate of clinical mastitis in many countries or regions, knowledge of SCC at the cow or bulk tank level helps encourage farmers to improve herd health and to develop strategies for infection prevention and cure. Therefore, more research into bulk tank SCC and clinical mastitis rates is needed to explain the effect of heat stress on dairy cow udder health and functions that could be influenced by abatement plans.

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“…Adicionalmente, na Nova Zelândia, estudo avaliou a eficácia do uso de antibiótico Sendo assim, o uso de TVS resultou em mudança na incidência e na etiologia das mastites, sendo que os agentes patogênicos ambientais tornaram-se cada vez mais comuns (BRADLEY;GREEN, 2001;BRADLEY et al, 2011). No entanto, no Brasil, patógenos contagiosos continuam sendo um problema para as fazendas leiteiras(FARRE et al, 2017;TOMAZI et al, 2018). Por isso, antimicrobianos de amplo espectro foram desenvolvidos para atuar tanto contra patógenos ambientais quanto contagiosos.…”

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Primeiramente agradeço a Deus, pela dádiva da vida e por me dar discernimento e força durante todas as etapas deste estudo. Obrigado por me permitir errar, aprender e crescer. Agradeço também pelas vacas, obras de sua criação e que se tornaram uma paixão pra mim e fruto de meu trabalho. À minha família, que apesar da distância, jamais me deixaram faltar amor, carinho, companheirismo e confiança. Vocês souberam entender minhas ausências, souberam compreender e me apoiar durante os momentos de dificuldade, mas também vibraram comigo todas as minhas conquistas. Obrigado mãe, pai e irmão por cada palavra de incentivo e apoio, amo vocês! À minha namorada Larissa, a joia que a vida me presenteou, a quem admiro e sou muito grato. Obrigado por suportar e ser paciente durante os momentos de angústia e tristeza. Tua companhia, teu abraço, teu amor e palavras de carinho amenizaram a dor e abrilhantaram meus dias. Ao meu orientador Prof. Marcos Veiga dos Santos, pela confiança, por todas as oportunidades e pela orientação. O senhor é um grande incentivador e responsável pelo meu crescimento pessoal e profissional. Sem dúvidas contribuíste muito para que mais um de meus êxitos (a finalização desta dissertação) fosse possível.

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Association of herd-level risk factors and incidence rate of clinical mastitis in 20 Brazilian dairy herds

Cited by 42 publications

References 40 publications

Genotyping and antimicrobial resistance of Streptococcus uberis isolated from bovine clinical mastitis

Genotyping and antimicrobial resistance of Streptococcus uberis isolated from bovine clinical mastitis

Effect of heat stress on udder health of dairy cows

>b<Eficácia do selante interno de tetos na secagem de vacas leiteiras sobre a saúde do úbere>/b<

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