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• W2897251989 abstract "The objectives of this study were to characterize the pathogen frequency and severity of clinical mastitis (CM) in 20 dairy herds of southeastern Brazil; and to determine the incidence rate of clinical mastitis (IRCM; overall and based on specific-pathogen groups) based on quarter time at risk and its association with risk factors at the herd-level. Data were recorded in each herd for a period of 8 to 15 months. The association between herd-level risk factors and IRCM were determined by two groups of mixed regression models: one based on the overall IRCM, and five based on the following specific-pathogen groups: contagious, other Gram-positive, Gram-negative, other, and negative culture. The following herd-level risk factors were evaluated: herd size, housing system, average daily milk yield per cow, bulk milk somatic cell count (BMSCC), and bulk milk total bacterial count (BMTBC). A total of 5957 quarter-cases of CM were recorded from 2637 cows, but only 4212 cases had milk samples collected for culture. The most frequently isolated pathogens were Escherichia coli (6.6% of total cultures), Streptococcus uberis (6.1%), and Streptococcus agalactiae (5.9%). The majority of CM cases were mild (60.3%), while 34.1% were moderate and 5.6% severe. The frequency of severe CM cases was lower for those with a Gram-positive result (4.6%) compared to a Gram-negative result (11.4%). Overall, monthly mean IRCM was 9.7 cases per 10,000 quarter-days at risk (QDAR). Herds with a geometric mean BMSCC ≥ 601 × 103 cell/mL had higher overall IRCM (16/10,000 QDAR) than those with BMSCC ≤ 600 × 103 cell/mL (≤7.7/10,000 QDAR). When the specific-pathogen groups were evaluated, for contagious pathogens, variables housing (free-stalls or compost-bedded pack barns), BMSCC (≥601 × 103 cells/mL), and average daily milk yield per cow (21 and 25 Kg/d) presented the highest IRCM. Furthermore, in Gram-negative group, herds with BMTBC ≥ 31 × 103 cfu/mL had higher IRCM compared with herds with BMTBC ≤ 30 × 103 cfu/mL. Although environmental pathogens were the most common cause of CM in this study, contagious pathogens (e.g., Strep. agalactiae and Staph. aureus) are still a concern in dairy herds of Brazil. Additionally, as there were some herd-level risk factors associated with the IRCM, there may be opportunity for management strategies aiming to improve the control of CM in dairy herds." @default.
• W2897251989 created "2018-10-26" @default.
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• W2897251989 date "2018-12-01" @default.
• W2897251989 modified "2023-10-16" @default.
• W2897251989 title "Association of herd-level risk factors and incidence rate of clinical mastitis in 20 Brazilian dairy herds" @default.
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• W2897251989 doi "https://doi.org/10.1016/j.prevetmed.2018.10.007" @default.
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