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Related Experiment Videos

Rumen microbial changes in cattle fed diets with or without salinomycin.

D B Olumeyan, T G Nagaraja, G W Miller

    Applied and Environmental Microbiology
    |February 1, 1986
    PubMed
    Summary
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    Salinomycin supplementation in steers alters rumen microbial populations, decreasing total bacteria and protozoa while increasing salinomycin-resistant and amylolytic bacteria. It also lowers the acetate-to-propionate ratio without affecting total volatile fatty acids (VFA).

    Area of Science:

    • Ruminant nutrition and microbiology
    • Animal feed additives
    • Gut microbiome research

    Background:

    • Rumen microbial ecosystems are crucial for feed digestion and nutrient utilization in ruminants.
    • Ionophores like salinomycin are used in cattle diets to modulate rumen fermentation and improve performance.
    • Understanding salinomycin's impact on specific microbial groups and volatile fatty acids (VFA) is key to optimizing its use.

    Purpose of the Study:

    • To investigate the effects of dietary salinomycin on rumen microbial populations and VFA profiles in steers.
    • To quantify changes in bacterial counts, including specific functional groups and salinomycin-resistant populations.
    • To assess the impact on protozoal populations and key VFA concentrations.

    Main Methods:

    • Four rumen-fistulated steers were assigned to control or salinomycin-fed groups (0.22 mg/kg/day).

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  • Diets consisted of alfalfa hay and grain, with ratios adjusted over time (80:20, 50:50, 20:80).
  • Rumen samples were analyzed for total and selective bacterial counts, VFA concentrations, and protozoa enumeration.

    • Main Results:

    • Salinomycin did not alter rumen pH or total VFA concentration but significantly reduced the acetate-to-propionate ratio.
    • Total anaerobic bacterial counts decreased, while salinomycin-resistant and amylolytic bacteria populations increased in supplemented steers.
    • Protozoal populations, particularly Entodinium species, decreased, while holotrichs remained unaffected.

    Conclusions:

    • Dietary salinomycin significantly modifies rumen microbial composition, favoring resistant and amylolytic bacteria over total anaerobes.
    • The shift in VFA profile, indicated by a lower acetate-to-propionate ratio, suggests altered energy metabolism in salinomycin-fed steers.
    • Salinomycin effectively reduces certain protozoa, potentially influencing overall rumen function and nutrient availability.