Rumen fermentation, methane concentration and fatty acid proportion in the rumen and milk of dairy cows fed condensed tannin and/or fish-soybean oils blend

•In RUSITEC system blend of oils modulates fatty acid proportion regardless the presence of tannins.•The proportion of unsaturated fatty acids in the milk was not affected by oils blend×tannin mixture.•Oils blend x tannin mixture decreased methane concentration. Two experimental factors (extract fro...

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Bibliographic Details
Published in:Animal feed science and technology 2016-06, Vol.216, p.93-107
Main Authors: Szczechowiak, J., Szumacher-Strabel, M., El-Sherbiny, M., Pers-Kamczyc, E., Pawlak, P., Cieslak, A.
Format: Article
Language:English
Subjects:
Butyrivibrio fibrisolvens
Gene expression
Milk
Oil
Rumen
Tannins
Unsaturated fatty acid
Vaccinium
Vitis
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Summary:•In RUSITEC system blend of oils modulates fatty acid proportion regardless the presence of tannins.•The proportion of unsaturated fatty acids in the milk was not affected by oils blend×tannin mixture.•Oils blend x tannin mixture decreased methane concentration. Two experimental factors (extract from Vaccinium vitis idaea (VVI) and blend of fish-soybean oils) were investigated in three consecutive experiments to monitor their effects on rumen fermentation and fatty acid (FA) proportions in the rumen fluid and milk. Firstly, in vitro experiment was performed using a semicontinuous culture system (RUSITEC). Four treatments were included: (1) CON—control diet without experimental factors; (2) VVI—control diet with 4.5g of VVI/kg of DM; (3) FSM—control diet with 30g of fish and soybean oils blend/kg of DM; (4) MIX—control diet with 4.5g of VVI/kg of DM and 30g of oils blend/kg of DM. The proportions of C18:1 t10, C18:1 t11 and C18:1 c9 FA increased (P
ISSN:0377-8401
1873-2216
DOI:10.1016/j.anifeedsci.2016.03.014