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Relationship between intake and faecal excretion of indigestible fractions in trials with sheep: impact of the method of analysis, diet and trial

Published online by Cambridge University Press:  29 April 2022

C. A. Pozo Open the ORCID record for C. A. Pozo [Opens in a new window] ,
M. P. Mezzomo ,
J. Frasson ,
L. E. Leonardi ,
C. M. Christmann ,
D. C. Rösler  and
G. V. Kozloski Open the ORCID record for G. V. Kozloski [Opens in a new window]
C. A. Pozo
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil CIT-Formosa, CONICET, Faculty of Natural Resources, National University of Formosa, Formosa, 3600, Argentina
M. P. Mezzomo
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
J. Frasson
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
L. E. Leonardi
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
C. M. Christmann
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
D. C. Rösler
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
G. V. Kozloski*
Affiliation:
Department of Animal Science, Federal University of Santa Maria, Santa Maria, 97105-900, RS, Brazil
*
Author for correspondence: G. V. Kozloski, E-mail: gilberto.kozloski@ufsm.br
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Abstract

A data set of individual observations was compiled from 17 digestibility trials with sheep with the aim of evaluating the impact of the method of analysis and, within each method, the effect of dietary fibre content and trial on the faecal recovery rate (RR) of indigestible dry matter (iDM) and indigestible neutral detergent fibre (iNDF). Markers concentration in samples of diet and faeces were determined either in polyester filter bags of 40 μm of porosity incubated in situ for 144 h (method A; n = 257) or in bags of 16 μm of porosity incubated in situ for 288 h (method B; n = 321). Regardless of the incubation method, the intake of either iDM or iNDF was linearly (P < 0.05) related to the amount excreted in faeces and, for all linear relationships, the slopes were lower than 1 (i.e. between 0.53 and 0.71). Within both methods, the RR of both markers linearly decreased at increased NDF content in diet (P < 0.05). The root mean square error of the linear relationships varied from 0.147 to 0.189 which represented from 19% to 24% of the respective average RR of markers. In conclusion, regardless of the incubation method, the RR of both markers showed high individual variability and, thus, the use of average RR values obtained in controlled digestibility trials as an index to correct the individual digestibility values obtained with either marker in field trials has the potential to improve the accuracy but not the precision of the digestibility estimates.

Keywords

Digestibilityindigestible dry matterindigestible neutral detergent fibreinternal markersruminants
Type
Animal Research Paper
Information
The Journal of Agricultural Science , Volume 160 , Issue 3-4 , June 2022 , pp. 270 - 277
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press

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