4.6 Article

Hydroxy-selenomethionine supplementation promotes the in vitro rumen fermentation of dairy cows by altering the relative abundance of rumen microorganisms

Journal

JOURNAL OF APPLIED MICROBIOLOGY
Volume 132, Issue 4, Pages 2583-2593

Publisher

OXFORD UNIV PRESS
DOI: 10.1111/jam.15392

Keywords

Holstein cow; in vitro test; rumen fermentation; rumen microorganism; selenium

Funding

  1. China Agriculture Research System of Ministry of Finance
  2. China Agriculture Research System of Ministry of Agriculture and Rural Affairs

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This study found that supplementation with 0.6 mg/kg DM of hydroxy-selenomethionine can increase gas production, propionate, and total VFAs production in vitro by altering the relative abundance of specific bacterial species, serving as a potential rumen fermentation regulator in Holstein cows.
Aims This study aims to investigate the effect of hydroxy-selenomethionine supplementation on the in vitro rumen fermentation characteristics and microorganisms of Holstein cows. Methods and Results Five fermentation substrates, including control (without selenium supplementation, CON), sodium selenite supplementation (0.3 mg kg(-1) DM, SS03), and hydroxy-selenomethionine supplementation (0.3, 0.6 and 0.9 mg kg(-1) DM, SM03, SM06 and SM09, respectively) were incubated with rumen fluid in vitro. The results showed that in vitro dry matter disappearance and gas production at 48 h was significantly higher in SM06 than SM03, SS03 and CON; propionate and total volatile fatty acid (VFA) production was higher in SM06 than CON. Moreover, higher species richness of rumen fluid was found in SM06 than others. Higher relative abundance of Prevotella and Prevotellaceae-UCG-003 and lower relative abundance of Ruminococcus-1 were detected in SM06 than CON. Besides, higher relative abundance of Ruminococcaceae_UCG-005 was found in CON than other treatments. Conclusions It is observed that 0.6 mg kg(-1) DM hydroxy-selenomethionine supplementation could increase cumulative gas production, propionate, and total VFAs production by altering the relative abundance of Prevotella, Prevotellaceae-UCG-003, Ruminococcaceae_UCG-005 and Ruminococcus-1, so that it can be used as a rumen fermentation regulator in Holstein cows. Significance and Impact of the Study This study provides an optimal addition ratio of hydroxy-selenomethionine on rumen fermentation and bacterial composition via an in vitro test.

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