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Digestion of grass lipids and pigments in the sheep rumen

Published online by Cambridge University Press:  24 July 2007

R. M. C. Dawson  and
Norma Hemington
R. M. C. Dawson
Affiliation:
Biochemistry Department, ARC Institute of Animal Physiology, Babraham, Cambridge
Norma Hemington
Affiliation:
Biochemistry Department, ARC Institute of Animal Physiology, Babraham, Cambridge
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Abstract

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1. Digestion of grass lipids and pigments in the rumen of the sheep has been studied during starvation and following the administration of 14C-labelled grass.

2. Both galactolipids contained in chloroplasts are rapidly degraded, although mono-galactosyldiglycerides disappear faster than digalactosyldiglycerides. It was concluded that rumen micro-organisms are mainly responsible for this degradation, although grass itself also contains enzymes which can degrade galactolipids.

3. Rumen contents can degrade added 14C-labelled mono- and digalactosyldiglycerides in vitro at a rate sufficient to account for the disappearance of galactolipids in the intact rumen. The initial enzyme attack is probably a successive deacylation to give monogalactosylglycerol and digalactosylglycerol.

4. Most of the chlorophyll pigments are rapidly converted into phaeophytins by loss of magnesium. A small proportion of chlorophyll a and more of chlorophyll b remains intact even after 24 h starvation. On the other hand, about half the phaeophytin undergoes further rapid decomposition to yield phylloerythrin.

5. Although the grass phospholipids are extensively degraded, β-carotenes and many non-polar compounds, e.g. steroids, appear to undergo little change in the rumen.

Type
General Nutrition
Information
British Journal of Nutrition , Volume 32 , Issue 2 , September 1974 , pp. 327 - 340
Copyright
Copyright © The Nutrition Society 1974

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