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The mobile bag technique as a method for determining the degradation of four botanically diverse fibrous feedstuffs in the small intestine and total digestive tract of ponies

Published online by Cambridge University Press:  09 March 2007

M. J. S. Moore-Colyer ,
J. J. Hyslop ,
A. C. Longland  and
D. Cuddeford
M. J. S. Moore-Colyer*
Affiliation:
Institute of Rural Studies, University of Wales Aberystwyth, Llanbadarn Fawr, Aberystwyth SY23 3AL, Ceredigion, Wales, UK
J. J. Hyslop
Affiliation:
Department of Veterinary Clinical Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin EH25 9RG, Midlothian, Scotland, UK
A. C. Longland
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, Ceredigion, Wales, UK
D. Cuddeford
Affiliation:
Department of Veterinary Clinical Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin EH25 9RG, Midlothian, Scotland, UK
*
*Corresponding author: Dr M. J. S Moore-Colyer, fax +44 1970 611264, email mem@aber.ac.uk
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Abstract

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An in sacco mobile bag technique was used to determine the rate and extent of disappearance of unmolassed sugar-beet pulp, soyabean hulls, hay cubes and an oat hull–naked oats mixture (67:33, w/w) in the foregut and total digestive tract of ponies. Ponies were administered naso-gastrically polyester mesh bags (60×10×10 mm) containing 350 mg feed, in a 3×4 Latin square design. Bags were collected at the ileo-caecal junction (small intestine bag, SIB) and in the faeces (faecal bag, FB) and their residues analysed for proximate constituents and NSP composition and content. DM disappearances from individual bags were fitted to degradation profiles () and effective degradability values determined. Significant differences (P<0·05) in DM, organic matter and crude protein (N×6·25) losses from SIB were noted between feeds with hay cubes and oat hulls–naked oats > sugar-beet pulp and soyabean hulls. Acid-detergent fibre, neutral-detergent fibre and NSP disappearances were small and varied little between feeds. In contrast, FB losses showed significant (P<0·05) differences for all constituents measured with sugar-beet pulp > soyabean hulls > hay cubes > oat hulls–naked oats. Crude protein losses from sugar-beet pulp and soyabean hulls in FB were significantly higher (P<0·05) than from SIB. FB degradation curves showed degradation to be affected by bag residence time with sugar-beet pulp > soyabean hulls and the effective degradability showed that significantly more (P<0·05) sugar-beet pulp was lost at 40.0 and 60.0 h than for the other three feeds. These results show that sugar-beet pulp and soyabean hulls are rapidly degraded by ponies and could be used as alternatives to hay in equid rations. However, the foregut availability of crude protein from sugar-beet pulp is poor, so a readily digestible source of crude protein should be offered to animals with high protein demands when diets are based on sugar-beet pulp.

Keywords

HorseFibreDegradation profilesEffective degradabilityMobile bags
Type
Research Article
Information
British Journal of Nutrition , Volume 88 , Issue 6 , December 2002 , pp. 729 - 740
Copyright
Copyright © The Nutrition Society 2002

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