Effects of different oils and plant extracts on in vitro ruminal methane production.
Storlien, T. M., Harstad, O.M., Narvaez, N., Wang, Y., and McAllister, T.A. (2013). "Effects of different oils and plant extracts on in vitro ruminal methane production.", Acta Agriculturae Scandinavica, Section A - Animal Science, 62(4), pp. 300-304. doi : 10.1080/09064702.2013.773058 Access to full text
Effects of oils and plant extracts on CH4 production from a barley grain (47%) – barley silage diet [53%; dry matter (DM) basis] were investigated. Exp. 1 used ruminal fluid alone (control), canola oil (CO), sunflower oil (SO), cod liver oil (CLO), or a (70:30) mixture of CO and CLO (MIX) at 2.5 or 5% of DM. CH4/g DMD increased (p < 0.05) for CO5, SO2.5, CLO5, and MIX5. In Exp. 2, MIX5, hop extract at 7.5 (H7.5) and 15.0 (H15.0) and steroidal saponin extract at 2.4 (S2.4) and 4.8 (S4.8)% DM with and without MIX5 were examined. H7.5–MIX and S2.4–MIX increased CH4/g DMD (p < 0.05). Addition of oil resulted in a decline in DMD in both experiments. None of the additives reduced CH4/g DMD. Further studies to determine if more than one mitigation additive has detrimental or synergistic impacts on CH4 produced per unit DMD are required.
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