Effect of microbial oil, evening primrose oil and borage oil on rumen fermentation in vitro
Jalc, D.(Slovenska Akademia Vied, Kosice (Slovak Republic). Ustav Fyziologie Hospodarskych Zvierat)E-mail:[email protected] | Potkanski, A.(August Cieszkowski Agricultural Univ., Poznan (Poland)) | Szumacher-Strabel, M.(August Cieszkowski Agricultural Univ., Poznan (Poland)) | Cieslak, A.(August Cieszkowski Agricultural Univ., Poznan (Poland)) | Certik, M.(Slovenska Technicka Univ., Bratislava (Slovak Republic). Chemickotechnologicka Fakulta)
Microbial oil (MO), evening primrose oil (EPO) and borage oil (BO) were added to a diet consisting of 80% of hay and 20% of barley in an artificial rumen (Rusitec). After a stabilization period (5 days), MO (5% wt/wt), EPO (5% wt/wt) and BO (5%wt/wt) were added to different vessels (6 days). Methane production was reduced by 11.32% (MO), 11.45% (EPO) and 2.04% (BO). Concentrations of short-chain fatty acids (FA) decreased by 0.1-0.3%, medium-chain FA by 8%, long-chain FA increased by 8%. Concentrations of stearic acid, which was the major FA in the effluent, were significantly reduced in oil supplemented diets. The percentage proportion of trans C18:1 isomers significantly increased. Finally, the oil supplementation caused incomplete biohydrogenation of unsaturated FA, which was characterized by an increase in trans 11 C18:1 concentration and trans 11 C18:1 to C18:0 ratio in oil supplemented diets.
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