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By W. W. Christie

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50,52 who, instead of fractionating rumen contents and incubating the fractions separately with substrate, incubated strained rumen contents in vitro with linoleic acid and subsequently fractionated large samples of the incubation mixture into fine food particles, protozoa, bacteria and cell-free supernatant fluid. These workers showed that 80% of the biohydro­ genation of the linoleic acid substrate occurred in association with the fine food particles; negligible changes took place in association with the cell-free supernatant fluid and, 36 C.

D. d. d. d. d. d. d. d. d. d. d. d. d. d. d. d. d. d. (l- 14 C)-isobutyrate 127 % incorporated into total fatty acids C-labeled Substrate into the Long-chain Fatty Acids of Lipids of Rumen Bacteria in vitro 44 C. G. 8 — 18:2 TABLE 16. Incorporation of Isoleucine and Short-chain Fatty Acids into the Long-chain Fatty Acids of the Lipids of Mixed Rumen Protozoa Incubated in vitro3 Unidentified Cardiolipin Phosphatidylglycerol Phosphatidylethanolamine Phosphatidic acid Phosphatidylcholine Glycolipid Lipid % of label recovered in appropriate phospholipid (U-14C)-glucose Na-(l-14C)-acetate Ihr 2hr Ihr 2 hr TABLE 15.

As this hydrolysis releases an unesterified fatty acid into the rumen, one might expect hydrogénation of this released unsaturated fatty acid to take place in the same way as hydrogénation of unesterified fatty acids. 106 observed that when sheep were given intraruminal infusions of linoleic acid in unesterified and trigly­ céride form, there were differences in the extent to which linoleic acid eventually appeared in the plasma lipids, much less being present when triglycérides of linoleic acid were administered to the rumen than when unesterified linoleic acid had been administered.

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