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Evaluation of methodological aspects of digestibility measurements in ponies fed different haylage to concentrate ratios

Published online by Cambridge University Press:  17 April 2017

F. J. W. C. Schaafstra ,
D. A. van Doorn ,
J. T. Schonewille ,
M. M. J. van Riet ,
P. Visser ,
M. C. Blok  and
W. H. Hendriks
F. J. W. C. Schaafstra*
Affiliation:
Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CM Utrecht, The Netherlands
D. A. van Doorn
Affiliation:
Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CM Utrecht, The Netherlands Department of Equine Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 112, 3584 CM Utrecht, The Netherlands
J. T. Schonewille
Affiliation:
Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CM Utrecht, The Netherlands
M. M. J. van Riet
Affiliation:
Animal Nutrition Group, Wageningen University, Elst 1, 6708 WD Wageningen, The Netherlands
P. Visser
Affiliation:
Department of Equine Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 112, 3584 CM Utrecht, The Netherlands
M. C. Blok
Affiliation:
Productschap Diervoeder, Elst 1, 6708 WD, Wageningen, The Netherlands
W. H. Hendriks
Affiliation:
Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 7, 3584 CM Utrecht, The Netherlands Animal Nutrition Group, Wageningen University, Elst 1, 6708 WD Wageningen, The Netherlands
*
†E-mail: fjwcschaafstra@home.nl
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Abstract

Methodological aspects of digestibility measurements were studied in four Welsh pony geldings consuming haylage-based diets with increasing proportions of a pelleted concentrate according to a 4×4 Latin square design experiment. Ponies were fed four experimental, iso-energetic (net energy (NE) basis) diets (i.e. 22 MJ NE/day) with increasing proportions of a pelleted concentrate (C) in relation to haylage (H). The absolute amounts of diet dry matter fed per day were 4.48 kg of H (100H), 3.36 and 0.73 kg of H and C (75H25C), 2.24 and 1.45 kg of H and C (50H50C) and 1.12 and 2.17 kg of H and C (25H75C). Diets were supplemented with minerals, vitamins and TiO2 (3.7 g Ti/day). Voluntary voided faeces were quantitatively collected daily during 10 consecutive days and analysed for moisture, ash, ADL, acid-insoluble ash (AIA) and Ti. A minimum faeces collection period of 6 consecutive days, along with a 14-day period to adapt the animals to the diets and become accustomed to the collection procedure, is recommended to obtain accurate estimations on dry matter digestibility and organic matter digestibility (OMD) in equids fed haylage-based diets supplemented with concentrate. In addition, the recovery of AIA, ADL and Ti was determined and evaluated. Mean faecal recovery over 10 consecutive days across diets for AIA, ADL and Ti was 124.9% (SEM 2.9), 108.7% (SEM 2.0) and 97.5% (SEM 0.9), respectively. Cumulative faecal recovery of AIA significantly differed between treatments, indicating that AIA is inadequate to estimate the OMD in equines. In addition, evaluation of the CV of mean cumulative faecal recoveries obtained by AIA, ADL and Ti showed greater variations in faecal excretion of AIA (9.1) and ADL (7.4) than Ti (3.7). The accuracy of prediction of OMD was higher with the use of Ti than ADL. The use of Ti is preferred as a marker in digestibility trials in equines fed haylage-based diets supplemented with increasing amounts of pelleted concentrate.

Keywords

dietary markersdigestibilityequinesrecoverytotal faeces collection
Type
Research Article
Information
animal , Volume 11 , Issue 11 , November 2017 , pp. 1922 - 1929
Copyright
© The Animal Consortium 2017 

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