Associations between early lactation intramammary infections and udder health and performance during the first 180 days in milk in first-lactation organic dairy cows

Peña-Mosca, Felipe; Dean, Chris; Fernandes, Leticia; Doster, Enrique; Sharpe, Kirsten; Ray, Tui; Feijoo, Victoria; Antunes, Acir; Baumann, Carol; Wehri, Thomas; Heins, Bradley; Pinedo, Pablo; Machado, Vinicius; Noyes, Noelle; Caixeta, Luciano

doi:10.3168/jds.2023-23924

Cited by 1 publication

(1 citation statement)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, this study showed that SAU and Streptococcus spp. in early lactation were associated with a higher risk of high somatic cell count ( SCC ) during the first 180 days of lactation in organic dairy cows (Peña-Mosca et al, 2023a). Non- aureus Staphylococci and Mammaliicocci ( NASM ) are also highly prevalent in milk samples (De Buck et al, 2021; Peña-Mosca et al, 2023b), but unlike SAU and Streptococcus , NASM have been associated with increased milk production (Piepers et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

In vitroantimicrobial activity of non-aureus StaphylococciandMammaliicocciagainstStaphylococcus aureusandStreptococcus uberisand their relationship with the presence of intramammary infections in organic dairy cows

Peña-Mosca,

Gaire,

Dean

et al. 2024

Preprint

View full text Add to dashboard Cite

This study aimed to: (1) Assess thein vitroantimicrobial activity of non-aureusStaphylococciandMammaliicocci(NASM) isolates from organic cows teat apices with and without intramammary infections (IMI) byStaphylococcus aureus(SAU) orStreptococcusspp. andStreptococcus-like organisms (SSLO); (2) Investigate the relationship between IMI status and NASM counts on teat apex; (3) Explore the relationship between NASM species taxonomy and the inhibitory activity against SAU andStreptococcus uberis(SUB). A total of 114 cows from 2 farms were sampled and followed from 8 weeks before to 5 weeks after calving. Weekly milk samples were cultured and used to design a case control study. Cases were defined as cows that had an IMI by SAU or SSLO, and controls were randomly chosen from cows without an IMI by these microorganisms. One teat apex sample from the week prior to IMI diagnosis was aerobically cultured. Taxonomy of recovered isolates was confirmed using mass spectrometry and whole genome sequencing. The inhibitory activity against SAU and SUB was investigated using agar dilution methods. Isolates were ranked based on in vitro inhibitory activity against SAU and SUB and categorized as "top 10" with the lowest minimum inhibitory concentration or not. The presence of NASM isolates classified as "top 10" against SAU was highest in controls (19.4%) compared to cases (5.8%). No difference in NASM counts on teat apex was observed between cases and controls. The inhibitory activity varied across NASM, withStaphylococcus succinusshowing the highest inhibitory activity against both SAU and SUB.

show abstract