Resumo

DELGADILLO-RUIZ, Lucía et al. Modification of ruminal fermentation in vitro for methane mitigation by adding essential oils from plants and terpenoid compounds. Abanico vet [online]. 2021, vol.11, e107.  Epub 21-Maio-2021. ISSN 2448-6132.  https://doi.org/10.21929/abavet2021.9.

Essential oils from plants are volatile aromatic compounds, mainly terpenoids, phenylpropanoids; monoterpenes, sesquiterpenes, and alcohols. These present a wide range of antimicrobial and antioxidant activity, so the addition of essential oils of clove, eucalyptus, peppermint, rosemary, oregano, and cinnamon can modify ruminal fermentation by reducing bacteria population producing methane and thus have a reduction in this gas production. The objective of this work was to evaluate different essential oils and terpenoid compounds to improve ruminal fermentation and the volatile fatty acid production, attenuating methane generation. The chemical composition (terpenoids) of the oils, as well as volatile fatty acids (VFAs), were determined by gas chromatography. For in vitro digestibility, the in vitro gas production technique was used, and the ruminal liquid was used. Methane was inferred from VFA concentration. It was found that all the essential oils presented each one of terpenoids in different concentrations, reporting the highest carvacrol concentration in clove essential oil (303 mg mL-1) and oregano (1.20 mg mL-1). Terpinene was presented in greater quantity in peppermint essential oil (4.83 mg mL-1); for peppermint and rosemary oil, linalool was higher and for limonene, the highest concentration was in eucalyptus oil (449 mg mL-1) and rosemary (12.42 mg mL-1). For gas production in digestibility, eucalyptus essential oil at a dose of 0.3 presented 176 mL g-1 DM. For in vitro digestibility, rosemary oil in high dose (0.6 mL) presented the best ruminal fermentation since it had better methane mitigation (716.83 mM/L) without negatively affecting the VFA concentration (acetate, 1892.2; propionic, 526.14; butyric, 24.99 mM/L), as well as terpenoids thymol, linalool, and limonene in high doses. It is concluded that the best in vitro ruminal fermentation with methane mitigation was observed with rosemary oil and terpenoid compounds were thymol, linalool, and limonene in the high dose.

Palavras-chave : plants; terpenoid compounds; volatile fatty acids; and methane.

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