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Metabolism and hindgut ecosystem in forage fed sedentary and athletic horses

Muhonen, Sara (2008). Metabolism and hindgut ecosystem in forage fed sedentary and athletic horses. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2008:68
ISBN 978-91-86195-01-4
[Doctoral thesis]

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The objective of this thesis was to study the effects of forage crude protein content and forage conservation method on metabolism and hindgut ecosystem, abrupt feed changes and exercise response. In total 22 horses, both sedentary and athletic, were used. The sedentary horses were fistulated in right ventral colon and the athletic horses were in Standardbred race training. In the sedentary horses bacterial counts, volatile fatty acid (VFA), pH and dry matter (DM) in colon content and faeces and in the athletic horses nitrogen intake and excretion, fluid and acid-base balance, digestibility and exercise response were measured. Forages used in the studies were 1) grass silage with 13% (RP) and 17% (HP) crude protein, 2) grass hay, haylage and silage (same cut): 81%, 55% and 36% DM, 3) grass hay and silage (same cut): 82% and 45% DM and 4) grass haylage and silage (same cut): 68% and 41% DM. Colon VFA concentrations were higher and pH was lower on the HP diet than the RP diet. No other major alterations in composition and activities of the colon ecosystem were found. In the athletic horses urine and faecal nitrogen excretion and water intake increased and faecal DM decreased on the HP diet compared to the RP diet already within 48 h. Colon lactobacilli increased on the silage diet and streptococci decreased on the haylage diet compared to the hay diet, but there were no changes in VFA concentrations or pH. Apparent digestibility was higher on the silage diet compared to the hay diet. Estimated evaporative fluid loss was higher and tended to be higher on the silage diet than the hay diet and on the HP diet than the RP diet, respectively. Changes were observed already within 48 h. Heart rate, blood pH, plasma lactate and total proteins did not differ between the RP diet and the HP diet or between the haylage diet and silage diet during exercise and recovery. However, the increased urine and evaporative fluid losses might be a disadvantage during more prolonged exercise when fluid loss is a limiting factor.

Authors/Creators:Muhonen, Sara
Title:Metabolism and hindgut ecosystem in forage fed sedentary and athletic horses
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2008
Number of Pages:76
ALLI. Muhonen, S., Connysson, M., Lindberg, J E., Julliand, V., Bertilsson, J. and Jansson, A. (2008). Effects of crude protein intake from grass silage-only diets on the equine colon ecosystem after an abrupt feed change. J Anim Sci. 2008 doi:10.2527/jas.2007-0374. II. Connysson, M., Muhonen, S., Lindberg, J E., Essén-Gustavsson, B., Nyman, G., Nostell, K. and Jansson, A. (2006). Effects on exercise response, fluid and acid-base balance of protein intake from forage-only diets in Standardbred horses. Equine vet J Suppl. Vol 36, 648-653. III. Muhonen, S., Julliand, V., Lindberg, J E., Bertilsson, J. and Jansson, A. (2008). Effects on the equine colon ecosystem of silage and haylage diets after an abrupt change from hay (submitted). IV. Muhonen, S., Lindberg, J E., Bertilsson, J. and Jansson, A. (2008). Effects on fluid balance, digestion and exercise response in Standardbred horses fed silage, haylage and hay (submitted).
Place of Publication:Uppsala
Publisher:Dept. of Animal Nutrition and Management, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Animal Health and Welfare (until Jan 2017)
ISBN for printed version:978-91-86195-01-4
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:horses, digestibility, digestive system, microbial flora, feeds, proximate composition, metabolism
Keywords:Colon microflora, Digestibility, Equine, Exercise response, Feed change, Fluid balance, Haylage, Nitrogen, Protein, Silage.
Permanent URL:
ID Code:1821
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
Deposited By: Sara Muhonen
Deposited On:30 Sep 2008 00:00
Metadata Last Modified:02 Dec 2014 10:14

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