Essential oils in nellore beef cattle: in vivo impact on rumen emissions.
2024
BENETEL, G. | FAGUNDES, G. M. | MÉO FILHO, P. DE | SILVA, T. DOS S. | WELTER, K. C. | MELO, F. A. | LOBO, A. A. G. | FRIGHETTO, R. T. S. | BERNDT, A. | MUIR, J. P. | BUENO, I. C. DA S. | GABRIELA BENETEL, UNIVERSIDADE DE SÃO PAULO; GISELE MARIA FAGUNDES, UNIVERSIDADE FEDERAL DE RORAIMA; PAULO DE MÉO FILHO, UNIVERSITY OF CALIFORNIA; THAYSA DOS SANTOS SILVA, UNIVERSIDADE DE SÃO PAULO; KATIÉLI CAROLINE WELTER, UNIVERSIDADE DE SÃO PAULO; FLÁVIA ALVES MELO, UNIVERSIDADE DE SÃO PAULO; ANNELISE AILA GOMES LOBO, UNIVERSIDADE DE SÃO PAULO; ROSA TOYOKO SHIRAISHI FRIGHETTO, CNPMA; ALEXANDRE BERNDT, CPPSE; JAMES PIERRE MUIR, TEXAS A&M AGRILIFE RESEARCH; IVES CLÁUDIO DA SILVA BUENO, UNIVERSIDADE DE SÃO PAULO.
Abstract: Essential oils (EOs), as rumen additives, decreased CH4 emissions in in vitro trials but results from in vivo studies are still limited. We investigated the effects of Origanum vulgare (OEO) and Thymus vulgaris (TEO) EOs on in vivo methane emissions from Nellore beef cattle. Six adult rumen-cannulated Nellore cattle were used in a double 3 × 3 Latin square design. Treatments consisted of three diets containing either 3 mL OEO per kg of concentrate, 3 mL TEO/kg of concentrate, or no EO addition. The experimental period consisted of three 21 d feeding periods and methane production was measured using the sulfur hexafluoride (SF6) technique from Day 16 to Day 21 of each feeding period. Intake, total apparent digestibility (dry matter as well as neutral and acid detergent fiber), and rumen parameters (pH, ammoniacal nitrogen concentration, and short-chain fatty acids) were also evaluated. The EOs did not decrease CH4 emissions and had no effect on rumen parameters.
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