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Related Experiment Videos

Plant extracts affect in vitro rumen microbial fermentation.

M Busquet1, S Calsamiglia, A Ferret

  • 1Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.

Journal of Dairy Science
|January 24, 2006
PubMed
Summary

Plant extracts and metabolites can alter rumen fermentation. Garlic oil and benzyl salicylate show potential for inhibiting methane production, while others reduce ammonia, offering options for feed management.

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Area of Science:

  • Rumen microbiology and nutrition
  • Animal science
  • Plant biochemistry

Background:

  • Rumen fermentation significantly impacts nutrient utilization and greenhouse gas emissions in ruminants.
  • Plant-derived compounds are increasingly explored as feed additives to modulate rumen function.
  • Understanding the specific effects of various plant extracts and metabolites is crucial for optimizing livestock diets.

Purpose of the Study:

  • To evaluate the impact of different doses of 12 plant extracts and 6 secondary plant metabolites on rumen fermentation in vitro.
  • To identify specific compounds that can modulate volatile fatty acid (VFA) production and ammonia concentration.
  • To assess the potential of these natural compounds for mitigating methane production and improving feed efficiency in dairy cattle.

Main Methods:

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  • Incubation of diluted ruminal fluid with a 50:50 forage:concentrate diet for 24 hours.
  • Addition of 12 plant extracts and 6 secondary plant metabolites at four different doses (3, 30, 300, and 3,000 mg/L).
  • Analysis of total volatile fatty acid (VFA) concentration, VFA proportions (acetate, propionate, butyrate), and ammonia nitrogen (NH3-N) concentration.

Main Results:

  • Most treatments at 3,000 mg/L decreased total VFA, with cade oil, capsicum oil, dill oil, fenugreek, ginger oil, and yucca showing no effect.
  • Anethol, anise oil, carvone, and tea tree oil reduced acetate and propionate proportions, indicating potential negative nutritional impacts.
  • Garlic oil and benzyl salicylate at 300 and 3,000 mg/L reduced acetate while increasing propionate and butyrate, suggesting methane inhibition.
  • Capsicum oil, carvacrol, carvone, cinnamaldehyde, cinnamon oil, clove bud oil, eugenol, fenugreek, and oregano oil at 3,000 mg/L reduced ammonia N concentration by 30–50%.

Conclusions:

  • Specific plant extracts and secondary metabolites can significantly alter rumen fermentation patterns.
  • Garlic oil and benzyl salicylate show promise for methane mitigation in ruminants.
  • Several compounds effectively reduce ammonia production, offering potential for improved nitrogen utilization.
  • Careful selection and combination of these natural additives could optimize rumen microbial fermentation for sustainable livestock production.