Objectives: This study aimed to characterize and compare the milk microbiota composition among Holstein Friesian cows with healthy (HU), mastitis-suspected (MSU), and subclinical mastitis (SM) udders in Southern Vietnam. Materials and Methods: Sixty milk samples were collected from two dairy farms and classified based on somatic cell counts (SCC) into three groups: HU (400,000 cells/ml). Bacterial communities were profiled using Illumina MiSeq sequencing of the 16S rRNA gene. Results: The prevalence of subclinical mastitis was 46.67% (p Proteobacteria, Firmicutes, Actinobacteria, and Bacteroidetes (>90%); and taxa of Moraxellaceae, Sphingomonadaceae, Enterobacteriaceae, Erysipelotrichaceae, and Streptococcaceae. Analysis revealed significant dysbiosis in the SM group, characterized by elevated relative abundances of mastitis-associated taxa (Mycobacteriaceae, Streptococcaceae, Moraxellaceae, Pasteurellaceae, and Mycoplasmataceae) compared to healthy udders (p Rikenellaceae, Lactobacillaceae, Sphingomonadaceae, and Opitutaceae) were significantly depleted in SM samples but remained abundant in both HU and MSU groups (p p > 0.05), with no distinct variation in key bacterial families. Principal coordinate analysis further confirmed that SM samples formed a distinct cluster separate from the HU and MSU groups. Conclusions: Subclinical mastitis drives significant shifts in the milk microbiome. However, mastitis-suspected cows retain a microbiome similar to that of healthy udders, suggesting that SCC thresholds alone may require careful interpretation in borderline cases.
Nguyen et al. (Thu,) studied this question.
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