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The effect of including Colombian rice polishings in the diet on rumen fermentation in vitro

Published online by Cambridge University Press:  02 September 2010

D. Cardenas Garcia ,
C. J. Newbold ,
H. Galbraith  and
J. H. Topps
D. Cardenas Garcia
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
C. J. Newbold
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
H. Galbraith
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
J. H. Topps
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
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Abstract

The effect of including full-fat Colombian rice polishings, at 250 or 500 g/kg dry matter (DM) or defatted Colombian rice polishings (at 500 g/kg DM) on the fermentation of a basal diet of dried grass and medium-quality hay, in the rumen simulation technique (Rusitec), was investigated. With diets which contained 0, 0·25, 0·50 full-fat or 0·50 defatted, proportions of rice polishing, values for pH were depressed (7·22, 7·19, 7·11, 7·06 (s.e.d. 0·05)) and total volatile fatty acid concentrations were increased (52·8, 52·5, 75·5, 754 (s.e.d. 2·1) mmol/l) at the high levels of inclusion of rice polishings. Concentrations of ammonia (130, 140, 228, 209 (s.e, d. 64) mg/l) and total bacterial numbers (2·32, 2·70, 3·55, 442 (s.e.d. 0·82) × 108 per ml) were elevated by rice polishings inclusion. Numbers of cellulolytic bacteria (2·52, 1·74, 1·84, 2·10 (s.e.d. 0·60) × 106 per ml) and protozoa (19·8, 16·2, 15·8, 22·2 (s.e.d. 1·51) × 103 per ml were depressed (the latter significantly P < 0·01) by the inclusion offull-fat, but not by defatted, rice polishings.

Keywords

fermentationrice polishingsrumen simulation technique
Type
Research Article
Information
Animal Production , Volume 54 , Issue 2 , April 1992 , pp. 275 - 280
Copyright
Copyright © British Society of Animal Science 1992

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