<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This study investigated the effect of different milking systems on the milk composition and microbial community of raw milk in a commercial dairy farm. Raw milk samples from conventional milking system (CMS) and automatic milking system (AMS) were collected and the microbiota on each was assessed by 16S rRNA gene sequencing. Results showed that the acetone (P = 0.031) and β-hydroxybutyrate (P≤0.001) levels in the raw milk of the AMS group were increased compared with the CMS group. Principal component analysis, unweighted and weighted principal coordinates analysis, and heat map of microbial community composition in the raw milk showed a clear separation between two groups. AMS increased the abundance of the genera <italic>Acinetobacter</italic> (FDR = 0.004) and <italic>Staphylococcus</italic> (FDR = 0.004) in the raw milk compared with the CMS group. In contrast, the abundance of the genera <italic>Pseudomonas</italic> (FDR = 0.028), <italic>Lactococcus</italic> (FDR = 0.015), <italic>Sphingobacterium</italic> (FDR = 0.004), <italic>Brevundimonas</italic> (FDR = 0.005), and <italic>Chryseobacterium</italic> (FDR = 0.042) in the raw milk was reduced in the AMS group compared with the CMS group. The abundance of the genera <italic>Acinetobacter</italic> and <italic>Staphylococcus</italic> in the raw milk was positively correlated with the β-hydroxybutyrate, acetone, free fatty acid, citric acid, and urea nitrogen levels. Furthermore, the abundance of the genus <italic>Acinetobacter</italic> in the raw milk was negatively correlated with the somatic cell counts. The study demonstrates that the introduction of AMS in the dairy farm can regulate microbiota composition in the raw milk and this modification may exert an effect on reducing the somatic cell counts in the raw milk.</p></abstract>

This study investigated the effect of different milking systems on the milk composition and microbial community of raw milk in a commercial dairy farm. Raw milk samples from conventional milking system (CMS) and automatic milking system (AMS) were collected and the microbiota on each was assessed by 16S rRNA gene sequencing. Results showed that the acetone (P = 0.031) and β-hydroxybutyrate (P≤0.001) levels in the raw milk of the AMS group were increased compared with the CMS group. Principal component analysis, unweighted and weighted principal coordinates analysis, and heat map of microbial community composition in the raw milk showed a clear separation between two groups. AMS increased the abundance of the genera Acinetobacter (FDR = 0.004) and Staphylococcus (FDR = 0.004) in the raw milk compared with the CMS group. In contrast, the abundance of the genera Pseudomonas (FDR = 0.028), Lactococcus (FDR = 0.015), Sphingobacterium (FDR = 0.004), Brevundimonas (FDR = 0.005), and Chryseobacterium (FDR = 0.042) in the raw milk was reduced in the AMS group compared with the CMS group. The abundance of the genera Acinetobacter and Staphylococcus in the raw milk was positively correlated with the β-hydroxybutyrate, acetone, free fatty acid, citric acid, and urea nitrogen levels. Furthermore, the abundance of the genus Acinetobacter in the raw milk was negatively correlated with the somatic cell counts. The study demonstrates that the introduction of AMS in the dairy farm can regulate microbiota composition in the raw milk and this modification may exert an effect on reducing the somatic cell counts in the raw milk.

Comparison of raw cow milk microbiota in two milking systems: A field study

Department of Biotechnology and Animal Science

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Comparison of raw cow milk microbiota in two milking systems: A field study"}

This study investigated the effect of different milking systems on the milk composition and microbial community of raw milk in a commercial dairy farm. Raw...

Comparison of raw cow milk microbiota in two milking systems: A field study

Publié en ligne: 12 mai 2022

Pages: 785 - 794

Reçu: 07 juil. 2021

Accepté: 07 déc. 2021

DOI: https://doi.org/10.2478/aoas-2022-0005

Mots clés
automatic milking system, microbiota, raw milk, conventional milking system

© 2022 Po-An Tu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Comparison of raw cow milk microbiota in two milking systems: A field study

Publié en ligne: 12 mai 2022

Pages: 785 - 794

Reçu: 07 juil. 2021

Accepté: 07 déc. 2021

DOI: https://doi.org/10.2478/aoas-2022-0005

Mots clésautomatic milking system, microbiota, raw milk, conventional milking system

© 2022 Po-An Tu et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
automatic milking system, microbiota, raw milk, conventional milking system