Effects of increasing levels of stearidonic acid on methane production in a rumen in vitro system

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Amaro, P (Autor) Outra; Maia, MRG (Autor) ICBAS; Dewhurst, RJ (Autor) Outra; Antonio J M Fonseca (Autor) ICBAS; A. Cabrita (Autor) FCUP

Revista

Título: Animal Feed Science and Technology

Vol. 173

Páginas: 252-260

ISSN: 0377-8401

Editora: Elsevier

Indexação

ISI Web of Knowledge - 8 Citações

Scopus - 5 Citações

Classificação Científica

CORDIS: Ciências Naturais > Ciências agrárias > Zootecnia

FOS: Ciências agrárias > Ciência animal e dos lacticínios

Outras Informações

ID Authenticus: P-002-A40

DOI: 10.1016/j.anifeedsci.2012.02.007

Abstract (EN): Enteric methane constitutes an energy loss for the animal and contributes to global warming and climate change. Stearidonic acid (SDA; C18:4n-3), a highly polyunsaturated n-3 fatty acid, could have potential to reduce methane production. Effects of increasing levels of SDA on methane production were evaluated in short-term batch incubations (24h) of a mixed diet with buffered rumen fluid. Stearidonic acid was supplemented at 0 (SDA0: control), 1 (SDA1), 5 (SDA5), 20 (SDA20), and 50 (SDA50) mg/L incubation media. Increasing levels of SDA supplementation had no effect on total gas (mL) and methane production (mmol/g TMR dry matter, DM), or total concentration of volatile fatty acids (VFA; mmol/L). Stearidonic acid induced a shift to increased propionate production at the expense of acetate and butyrate, with the largest effect at the highest inclusion level. The apparent biohydrogenation of stearidonic acid was extensive, with less than 2% being detected after 24h of incubation, and only at the highest level of addition. Increasing levels of SDA promoted an accumulation of C18:2 and C18:1 isomers, particularly vaccenic acid (trans-11 C18:11). with no effect on the end-product (stearic acid; C18:0). Effects on fermentation pattern and SDA biohydrogenation were not associated with a reduction in methanogenesis, suggesting that either higher levels of non-esterified SDA or supplementation in an alternative form might be needed to achieve methane mitigation.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9