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Influence of sward height on bite dimensions of horses

Published online by Cambridge University Press:  18 August 2016

A. Naujeck  and
J. Hill
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Abstract

The management of pastures used by horses poses various problems: swards are often grazed down rapidly, patches of bare ground and refused areas develop. In order to gain a better understanding of the plant-animal interaction behind this problem the influence of sward height on bite dimensions (bite depth, weight, volume, area) of horses was investigated. Perennial ryegrass (Lolium perenne) microswards were grown on artificial substrate to four different heights (3, 8, 15, 19 cm) but the same plant density. Biomass and bulk density for each sward height was determined. Eight horses (predominantly Thoroughbred ×) were allowed to take six bites of each grass height. Bite depth, weight, volume and bite area were calculated.

Bite depth, weight, volume and area were not fixed, but increased with sward height (P < 005). For all sward heights, the horses removed between 51% and 68% of the initial grass length. The horses adjusted their bite dimensions to sward height but did not maximize food intake per bite. The response to sward height might be explained by a preference for easily digested food or the trade-off between energy intake and the cost for food processing.

This experiment suggests that grass height has a major influence on bite dimensions of horses. However there may be more complex factors influencing ingestive behaviour of horses (e.g. age, dietary experience and social behaviour) that have to be considered when horses are grazing pasture.

Keywords

biting dimensionsgrazing behaviourhorses
Type
Non-ruminant nutrition, behaviour and production
Information
Animal Science , Volume 77 , Issue 1 , August 2003 , pp. 95 - 100
Copyright
Copyright © British Society of Animal Science 2003

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References

Belovsky, G. E. 1986. Optimal foraging and community structure: implications for a guild of generalist grassland herbivores. Oecologia, Berlin 70: 35–52.Google Scholar
Black, J. L. and Kenney, P. A. 1984. Factors affecting diet selection by sheep. II. Height and density of pasture. Australian Journal of Agricultural Research 35: 579–594.CrossRefGoogle Scholar
Burlison, A. J., Hodgson, J. and Illius, A. W. 1991. Sward canopy structure and the bite dimensions and bite weight of grazing sheep. Grass and Forage Science 46: 29–38.Google Scholar
Carrère, P., Louault, F., De Faccio Carvalho, P. C., Lafarge, M. and Soussana, J. F. 2001. How does the vertical and horizontal structure of a perennial ryegrass and white clover sward influence grazing? Grass and Forage Science 56: 118–130.Google Scholar
Clemens, E. T. and Stevens, C. E. 1980. A comparison of gastro-intestinal transit time in ten species of mammal. Journal of Agricultural Science, Cambridge 94: 735–737.Google Scholar
Duncan, P. 1992. Horses and grasses. The nutritional ecology of equids and their impact on the Camargue. Ecological Studies Series, vol. 87. Springer-Verlag, New York. Google Scholar
Ellis, A. D., Hill, J., Fagence, K. and Warr, E. M. 2000. Effect of dental condition on short-term intake rates of hay and faecal particle size in adult horses. Proceedings of the 51st meeting of the European Association for Animal Production, Wageningen, The Netherlands, p. 375.Google Scholar
Fleurance, G., Duncan, P. and Mallevaud, B. 2001. Daily intake and the selection of feeding sites by horses in heterogeneous wet grasslands. Animal Research 50: 149–156.Google Scholar
Flores, E. R., Laca, E. A., Griggs, T. C. and Demment, M. W. 1993. Sward height and vertical morphological differentiation determine cattle bite dimensions. Agronomy Journal 85: 527–532.Google Scholar
Frape, D. 1998. Equine nutrition and feeding, second edition. Blackwell Science, Oxford.Google Scholar
Healy, W. B. 1967. Ingestion of soil by sheep. Proceedings of the New Zealand Society of Animal Production, vol. 27, pp. 109–120.Google Scholar
Heath, D. 1995. An introduction to experimental design and statistics for biology. UCL Press, London. Google Scholar
Hodgson, J. 1990. Grazing management. Longman Handbooks in Agriculture, Hong Kong.Google Scholar
Laca, E. A. and Demment, M. W. 1996. Foraging strategies of grazing animals. In The ecology and management of grazing systems (ed. Hodgson, J. and Illius, A. W.), pp. 137–158. CAB International, Oxford.Google Scholar
Laca, E. A., Ungar, E. D., Seligman, N. G. and Demment, M. W. 1992a. Effects of sward height and bulk density on bite dimensions of cattle grazing homogeneous swards. Grass and Forage Science 47: 91–102.Google Scholar
Laca, E. A., Ungar, E. D., Seligman, N. G., Ramey, M. R. and Demment, M. W. 1992b. An integrated methodology for studying short-term grazing behaviour of cattle. Grass and Forage Science 47: 81–90.Google Scholar
Milne, J. A., Hodgson, J., Thompson, R., Souter, W. G. and Barthram, G. T. 1982. The diet ingested by sheep grazing swards differing in white clover and perennial ryegrass content. Grass and Forage Science 37: 209–218.Google Scholar
Naujeck, A. and Hill, J. 2001. The impact of social and grazing behaviour on patch development in heavily grazed perennial ryegrass swards. Interfacing behaviour with other disciplines. Proceedings of the Association for the Study of Animal Behaviour (ASAB) summer conference, 19-21 September 2001, University of Glasgow, p. 24.Google Scholar
Neave, H. and Worthington, J. A. 1993. Distribution free tests. Routledge, London.Google Scholar
Putman, R. J., Pratt, R. M., Ekins, J. R. and Edwards, P. J. 1987. Food and feeding behaviour of cattle and ponies in the New Forest, Hampshire. Journal of Applied Ecology 24: 369–380.CrossRefGoogle Scholar
Statistical Packages for the Social Sciences. 1999. SPSS for Windows. SPSS Inc., Chicago, IL.Google Scholar
Ungar, E. D. and Ravid, N. 1999. Bite horizons and dimensions for cattle grazing herbage to high levels of depletion. Grass and Forage Science 54: 357–364.Google Scholar
Ungar, E. D., Ravid, N. and Bruckental, I. 2001. Bite dimensions for cattle grazing herbage at low levels of depletion. Grass and Forage Science 56: 35–45. Google Scholar
Van Soest, P. J. 1994. Nutritional ecology of the ruminant, second edition. Cornell University Press, New York.Google Scholar
Vulink, J. T. 2001. Optimal diet choice of free-ranging horses in vegetation of Phragmitis australis and tall herbs: a causal analysis. In The hungry herds (ed. Vunlink, J. T.), pp. 63–85. Ministerie van Verkeer en Waterstaat, Lelystad.Google Scholar
Wright, W. and Illius, A. W. 1995. A comparative study of the fracture properties of five grasses. Functional Ecology 9: 269–278.CrossRefGoogle Scholar