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Behavioural strategies used by parasitized and non-parasitized sheep to avoid ingestion of gastro-intestinal nematodes associated with faeces

Published online by Cambridge University Press:  02 September 2010

M. R. Hutchings ,
I. Kyriazakis ,
D. H. Anderson ,
I. J. Gordon  and
R. L. Coop
M. R. Hutchings
Affiliation:
Animal Biology Division, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
I. Kyriazakis
Affiliation:
Animal Biology Division, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
D. H. Anderson
Affiliation:
Animal Biology Division, Scottish Agricultural College, West Mains Road, Edinburgh EH9 3JG
I. J. Gordon
Affiliation:
Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH
R. L. Coop
Affiliation:
Moredun Research Institute, 408 Gilmerton Road, Edinburgh EH17 7JH
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Abstract

A study was instigated to test whether grazing herbivores have evolved effective strategies to reduce parasite ingestion and to assess the effects of parasitism on these strategies. Two choice trials, each using five animals parasitized with O. circumcincta and five parasite naive animals, were conducted to investigate cues used by sheep to avoid grazing swards contaminated with faeces. Animals were presented with pairs of artificial swards (36 × 21 cm) and allowed to graze for short periods. In the first trial, four quantities (0 g, 5 g, 15 g and 25 g), and in the second trial a control (no faeces) and three age classes (0, 10 and 21 days old), of faeces were tested against each other. Increasing amount offaeces per sward tray was associated with a reduced proportion of bites taken from the sward and reduced bite depth and mass. The minimum amount of faeces at which sheep showed significant levels of rejection was 15 g. Decreasing age of faeces was associated with a reduced proportion of bites taken from the sward, reduced bite depth and mass. This presented the paradox that grazing swards contaminated with young faeces presented least risk of parasitism, yet fresh faeces presented the strongest stimulus for sward rejection. Parasitism altered animal grazing behaviour with parasitized animals becoming more selective when avoiding contaminated swards, taking smaller bites at reduced bite rates compared with non-infected animals. The enhancement of faeces avoidance behaviours shown by parasitized animals could act to reduce further intake of parasites and suggests that grazing behaviour is affected by nematode infection.

Keywords

nematodaOstertagia circumcinctaparasitismselective grazingsheep
Type
Research Article
Information
Animal Science , Volume 67 , Issue 1 , August 1998 , pp. 97 - 106
Copyright
Copyright © British Society of Animal Science 1998

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References

Alexander, R. N., McGowan, M. 1966. The routine determination of in vitro digestibility of organic matter in forages—an investigation of the problems associated with continuous large scale operations. Journal of the British Grassland Society 21:140–147.CrossRefGoogle Scholar
Aoyama, M., Dohi, H., Shioya, S., Takeuchi, Y., Mori, Y. and Okubo, T. 1994. Feeding-deterrent substance in cattle faeces: its effects on ingestive behaviour in goats. Applied Animal Behaviour Science 40: 252–262.CrossRefGoogle Scholar
Arnold, G. W. 1966. The special senses in grazing animals. II. Smell, taste and touch and dietary habits in sheep. Australian Journal of Agricultural Research 17:531–542.CrossRefGoogle 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 35:565–578.CrossRefGoogle Scholar
Bown, M. D., Poppi, D. P. and Sykes, A. R. 1991. The effect of post-ruminal infusion of protein or energy on the pathophysiology of Trichostrongylus colubriformis infection and body composition in lambs. Australian Journal of Agricultural Research 42:253–267.Google Scholar
Christie, M. and Jackson, F. 1982. Specific identification of strongyle eggs in small samples of sheep faeces. Research in Veterinary Science 32:113–117.CrossRefGoogle ScholarPubMed
Coop, R. L., Sykes, A. R. and Angus, K. W. 1982. The effect of three levels of intake of Ostertagia circumcincta larvae on growth rate, food intake and body composition of growing lambs. Journal of Agricultural Science 98: 247–255.CrossRefGoogle Scholar
Cooper, J. 1997. The behavioural control of helminth infection by sheep. Ph.D. thesis, University of Aberdeen.Google Scholar
Dohi, H., Yamada, A. and Entsu, S. 1991. Cattle feeding deterrents emitted from cattle faeces. Journal of Chemical Ecology 17:1197–1203.CrossRefGoogle Scholar
Forbes, T. D. A. and Hodgson, J. 1985. The reaction of grazing sheep and cattle to the presence of dung from the same or the other species. Grass and Forage Science 40: 177–182.CrossRefGoogle Scholar
Giles, N. 1983. Behavioural effects of the parasite Schistcephalus solidus (cestoda) on an intermediate host, the three-spined stickleback, Gastrosteus aculeatus L. Animal Behaviour 31:1192–1194.CrossRefGoogle Scholar
Gulland, F. M. D. 1992. The role of nematode parasites in Soay sheep (Ovis aries L.) mortality during a population crash. Parasitology 105:493–503.CrossRefGoogle ScholarPubMed
Gulland, F. M. D. and Fox, M. 1992. Epidemiology of nematode infections of Soay sheep (Ovis aries L.) on St Kilda. Parasitology 105: 481–492.CrossRefGoogle Scholar
Hart, B. L. 1990. Behavioural adaptations to pathogens and parasites: five strategies. Neuroscience and Biobehavioural Reviews 14:273–294.CrossRefGoogle ScholarPubMed
Henderson, D. C. 1990. The veterinary book for sheep farmers. Farming Press, Ipswich.Google Scholar
Hutchings, M. R. and Harris, S. 1997. Effects of farm management practices on cattle grazing behaviour and the potential for transmission of bovine tuberculosis from badgers to cattle. The Veterinary Journal 153:149–162.CrossRefGoogle ScholarPubMed
Illius, A. W., Clark, D. A. and Hodgson, J. 1992. Discrimination and patch choice by sheep grazing grass clover swards. Journal of Animal Ecology 61:183–194.CrossRefGoogle Scholar
Illius, A. W. and Gordon, I. J. 1993. Diet selection in mammalian herbivores — constraints and tactics. In Diet selection (ed. Hughes, N.), pp. 157–181. Blackwell Scientific Publications, Oxford.Google Scholar
Illius, A. W., Gordon, I. J., Milne, J. D. and Wright, W. 1995. Costs and benefits of foraging on grasses varying in canopy structure and resistance to defoliation. Functional Ecology 9: 894–903.CrossRefGoogle Scholar
Keymer, A. E. and Read, A. F. 1991. Behavioural ecology: the impact of parasitism. In Parasite-host interactions-Coexistence or conflict? (ed. Toft, C. A., Aeschlimann, A. and Bolis, L.), pp. 37–61. Oxford Science Publications, Oxford.CrossRefGoogle Scholar
Kyriazakis, I., Tolkamp, B. J. and Hutchings, M. R. 1998. Towards a functional explanation for the occurrence of anorexia during parasitic infections. Animal Behaviour In press.Google Scholar
Lawes Agricultural Trust. 1993. Genstat 5 reference manual. Clarendon Press, Oxford.Google Scholar
Lozano, G. A. 1991. Optimal foraging theory: a possible role for parasites. Oikos 60:391–395.CrossRefGoogle Scholar
Marten, G. C. and Donker, J. D. 1964. Selective grazing induced by animal excreta. 1. Evidence for occurrence and superficial remedy. Journal of Dairy Science 47: 773–776.CrossRefGoogle Scholar
Milinski, M. 1984. Parasites determine a predator's optimal feeding strategy. Behavioural Ecology and Sociobiology 15: 35–37.CrossRefGoogle Scholar
Ministry of Agriculture, Fisheries and Food. 1986. Manual of veterinary parasitological techniques. HMSO, London.Google Scholar
Mylrea, P. J. and Hotson, I. K. 1969. Serum pepsinogen activity and the diagnosis of bovine ostertagiasis. British Veterinary Journal 125:379–388.CrossRefGoogle ScholarPubMed
Newman, J. A., Parsons, A. J. and Harvey, A. 1992. Not all sheep prefer clover, diet selection revisited. Journal of Agricultural Science 119:275–283.CrossRefGoogle Scholar
Patterson, H. D. and Thompson, R. 1971. Recovery of inter-block information when block sizes are unequal. Biometrica 58: 545–554.CrossRefGoogle Scholar
Pella, E. and Colombo, B. 1973. Study of carbon, hydrogen and nitrogen determination by combustion-gas chromatography. Mikrochim Ada, pp. 679–719.Google Scholar
Poppi, D. P., MacRae, J. C., Brewer, A. and Coop, R. L. 1986. Nitrogen transactions in the digestive tract of lambs exposed to the intestinal parasite, Trichostrongylus colubriformis. British Journal of Nutrition 55:593–602.CrossRefGoogle Scholar
Sykes, A. R. 1987. Endoparasites and herbivore nutrition. In Nutrition of herbivores (ed. Hacker, J. B. and Ternouth, J. H.), pp. 211–232. Academic Press, Harickvale, Australia.Google Scholar
Zar, J. H. 1984. Biostatistical analysis. Prentice-Hall International, New Jersey.Google Scholar