ABSTRACT
Objective
The first objective of this experiment was to determine and describe any differences
in rumen microbiota relative abundances between dairy cattle divergent for MUN breeding
values (MUNBV). The second objective was to ascertain whether any differences in rumen
microbiota relative abundances may be associated with phenotypical differences already
observed in dairy cattle divergent for MUNBV.
Materials and Methods
Rumen microbiota data were collected and collated from multiple trials that had been
conducted investigating differences in dairy cattle divergent for MUNBV where rumen
samples were taken via esophageal intubation.
Results and Discussion
On average 8% of the rumen microbiota genera detected differed in their relative abundance
based on MUNBV. High-MUNBV dairy cattle had a 10% increase in the relative abundance
ofBasfia and a 20% increase in the relative abundance ofSuccinivibrio compared with low-MUNBV dairy cattle. BothBasfia andSuccinivibrio have potential implications for rumen fermentation that require further investigation.
High-MUNBV dairy cattle also had a 17% increase in the relative abundance ofKandleria compared with low-MUNBV dairy cattle. Greater relative abundances ofKandleria may be affecting the health status of dairy cattle classified as high MUNBV resulting
in greater incidences of increase SCC.
Implications and Applications
Knowledge of differences in the relative abundance of the rumen microbiota of dairy
cows divergent for MUNBV highlights areas where future research is required as well
as the potential for using MUNBV as a metric for increasing animal welfare.
Key words
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Article info
Publication history
Accepted:
November 16,
2021
Received:
August 10,
2021
Footnotes
The authors have not declared any conflicts of interest.
Identification
Copyright
© 2022 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
