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A comparison of the effect of forage type and level of feeding on the digestibility and gastrointestinal mean retention time of dry forages given to cattle, sheep, ponies and donkeys

Published online by Cambridge University Press:  08 March 2007

R. A. Pearson*
Affiliation:
Centre for Tropical Veterinary Medicine, University of Edinburgh, Easter Bush Veterinary Centre, Centre for Tropical Veterinary Medicine, Roslin, Midlothian EH25 9RG, UK
R. F. Archibald
Affiliation:
Centre for Tropical Veterinary Medicine, University of Edinburgh, Easter Bush Veterinary Centre, Centre for Tropical Veterinary Medicine, Roslin, Midlothian EH25 9RG, UK
R. H. Muirhead
Affiliation:
University of Edinburgh, Department of Veterinary Clinical Studies, Easter Bush Veterinary Centre, Roslin, Midlothian EH25 9RG, UK
*
*Corresponding author: Dr R. Anne Pearson, fax +44 131 651 3903, email anne.pearson@ed.ac.uk
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Abstract

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Four cattle, sheep, ponies and donkeys were fed dehydrated lucerne, early-cut hay, later-cut hay or barley straw in a Latin square-based design for four periods of 35d. In the first sub-period animals were fed the diets ad libitum (1–21d) and in the second sub-period they were fed the same diet restricted to 0·75 of ad libitum intake (days 22–35). Measurements of forage intake, apparent digestibilities and gastrointestinal mean retention times (MRT) were made in the last 7d of each sub-period. Differences between species in voluntary DM intake (VDMI; g/kg live weight LW)0·75 and g/LW) were greatest on the lucerne and least on barley straw. Cattle VDMI (g/kg LW0·75) compared with intake of the other species was > ponies > sheep > donkeys on lucerne. On barley straw VDMI (g/kg LW0·75) of cattle compared with intake of the other species was = donkey = ponies > sheep. VDMI of hays were intermediate between the lucerne and straw forages. Apparent digestibilities of DM, organic matter (OM), neutral-detergent fibre (NDF) and acid-detergent fibre (ADF) of the lucerne and hays were higher in the ruminants than in the equids. Effect of feeding level was not significant. Gastrointestinal MRT was shorter in the equids than in the ruminants. On straw diets donkeys showed similar apparent digestibilities of feed components to those of the cattle, whilst apparent digestibility of the straw diet by the ponies was lowest. Results are discussed in relation to evolutionary differences in feeding and digestion strategy associated with fore- or hind-gut fermentation in ruminants and equids.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2006

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