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Mathematical modelling of digesta passage rate, mean retention time and in vivo apparent digestibility of two different lengths of hay and big-bale grass silage in ponies

Published online by Cambridge University Press:  07 June 2007

M. J. S. Moore-Colyer ,
H. J. Morrow  and
A. C. Longland
M. J. S. Moore-Colyer*
Affiliation:
Institute of Rural Studies, University of Wales Aberystwyth, Llanbadarn Campus, Aberystwyth SY23 3AL, Wales, UK
H. J. Morrow
Affiliation:
Enniskillen College of Agriculture, Levaghy, Enniskillen, Co Fermanagh BT74 4GF, UK
A. C. Longland
Affiliation:
Institute of Grassland and Environmental Research, Plas Gogerddan, Aberystwyth SY23 3EB, Ceredigion, Wales, UK
*
*Corresponding author: Dr Meriel J. S. Moore-Colyer, fax +44 1970 611564, email [email protected]
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Abstract

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Welsh-cross pony geldings (about 300kg live weight) were used in a 4×4 Latin square experiment to determine the rate of passage and apparent digestibility of unchopped big-bale grass silage (BBL), chopped big-bale grass silage (BBS), unchopped grass hay (HL) and chopped grass hay (HS) offered at approximately 15g/kg live weight per d. On day 1 of collection weeks, ponies were fed 85g ytterbium chloride hexahydrate-marked feed 1·5h after the morning meal. Total faecal collections commenced 8h later and continued for 168h. Apparent digestibilities of feed DM, organic matter (OM), crude protein (CP, N×6·25), acid-detergent fibre (ADF) and neutral-detergent fibre (NDF) were also determined. Faecal excretion data were subjected to the models of Pond et al. (1988) and digesta mean retention time (MRT) calculated from these models and using the algebraic method of Thielmans et al. (1978). Silage had significantly (P<0·05) higher digestibilities of DM, OM, CP, ADF and NDF than hay; however, chop length had no effect. All the models of Pond et al. (1988) accurately described (R2>0·8) the pattern of faecal marker excretion. MRT of BBL (29·0h)>BBS(27h)>HS and HL (26h). Compartmental analysis using the G3 model of Pond et al. (1988) showed BBL and HS diets had longer MRT in the time-dependent compartment, whereas BBS and HL had longer MRT in the time-independent compartment. Results from this experiment indicate that BBL and BBS are readily accepted and digested by ponies. While Yb is a successful external marker for determining total tract MRT and for modelling faecal excretion curves in horses, the results did not allow any definite conclusions to be drawn on digesta MRT within the different compartments of the equid gut.

Keywords

Digesta passage rateMean retention timeApparent digestibilityHorse
Type
Research Article
Information
British Journal of Nutrition , Volume 90 , Issue 1 , July 2003 , pp. 109 - 118
Copyright
Copyright © The Nutrition Society 2003

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