Ruminal Flora Studies in the Sheep V. the Amino Acid Composition of Rumen Bacterial Protein

Moir, P Holmes RJ; Underwood, E. J.

doi:10.1071/bi9530637

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1954

1966

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The nature of bacterial lipids in the rumen of hay‐fed sheep

Garton¹,

Oxford²

1955

J Sci Food Agric

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The lipids extracted from the mixed ' free ' rumen micro-flora of two hay-fed sheep consisted of 39.2% of phospholipids, 38.2% o€ neutral fat, 12.4% of lower fatty acids (probably rumen fermentation products), 10.1 yo of unsaponifiable matter and 0.1 yo of steam-volatile, neutral solid. The ' true ' lipids amounted to 9 % of the dry weight of the bacteria. The neutral fat was noteworthy for the relatively high mean molecular weight (312.0) of its component acids. No linoleic or linolenic acid was detected in the neutral fat or phospholipids. The significance of this with respect to the host animal is discussed. The ?$ : 1 ' ratio of the phospholipids indicated the presence of mono-and di-aminophosphatides. The unsaponifiable matter contained carotenoid pigments (probably xanthophylls) and 16.1 yo of a steroid-like substance, possibly CZ7H4802, m.p. r3o-r3z0, precipitable by digitonin, but not identical with the hydrated form of cholesterol.

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