The use of a gamma-type function to assess the relationship between the number of adult <span class="italic">Teladorsagia circumcincta</span> and total egg output

S. C. BISHOP; M. J. STEAR

doi:10.1017/S0031182099006526

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Volume 121, Issue 4
October 2000 , pp. 435-440

The use of a gamma-type function to assess the relationship between the number of adult Teladorsagia circumcincta and total egg output

S. C. BISHOP ^(a1) and M. J. STEAR ^(a2)

- DOI: https://doi.org/10.1017/S0031182099006526
- Published online by Cambridge University Press: 09 November 2000

Abstract

The relationship between faecal nematode egg count and the number of adult Telordasagia circumcincta was examined in 508 naturally infected lambs at 6–7 months of age. The relationship was found to be convex and was empirically described by a gamma-type function of the form y = anb e−cn, where n is the number of adult nematodes present and y is the number of nematode eggs per gramme (epg) of faeces. This equation predicted that the peak expected egg count (277 epg) would occur at a worm burden of 2167 adult worms. The absence of a linear relationship between egg counts and worm numbers is consistent with the existence of severe density-dependent constraints on the fecundity of T. circumcincta.

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2000 Cambridge University Press

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Corresponding author: Department of Veterinary Clinical Studies, University of Glasgow Veterinary School, Bearsden Road, Glasgow G61 1QH, Scotland, UK. Tel: +0141 330 5762. Fax: +0141 942 7215. E-mail: gvma05@udcf.gla.ac.uk

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Cited by 28
Cited by
- 28
Crossref Citations

This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

IRVINE, R. J. STIEN, A. DALLAS, J. F. HALVORSEN, O. LANGVATN, R. and ALBON, S. D. 2001. Contrasting regulation of fecundity in two abomasal nematodes of Svalbard reindeer (Rangifer tarandus platyrhynchus). Parasitology, Vol. 122, Issue. 06,

CrossRef

Google Scholar

STEAR, M. J. ABUAGOB, O. BENOTHMAN, M. BISHOP, S. C. INNOCENT, G. KERR, A. and MITCHELL, S. 2005. Variation among faecal egg counts following natural nematode infection in Scottish Blackface lambs. Parasitology, Vol. 132, Issue. 02, p. 275.

CrossRef

Google Scholar

Davies, G. Stear, M. J. and Bishop, S. C. 2005. Genetic relationships between indicator traits and nematode parasite infection levels in 6-month-old lambs. Animal Science, Vol. 80, Issue. 02,

CrossRef

Google Scholar

Behnke, J.M. Chiejina, S.N. Musongong, G.A. Fakae, B.B. Ezeokonkwo, R.C. Nnadi, P.A. Ngongeh, L.A. Jean, E.N. and Wakelin, D. 2006. Naturally occurring variability in some phenotypic markers and correlates of haemonchotolerance in West African Dwarf goats in a subhumid zone of Nigeria. Veterinary Parasitology, Vol. 141, Issue. 1-2, p. 107.

CrossRef

Google Scholar

Stear, Michael J Fitton, Lesley Innocent, Giles T Murphy, Lisa Rennie, Kerry and Matthews, Louise 2007. The dynamic influence of genetic variation on the susceptibility of sheep to gastrointestinal nematode infection. Journal of The Royal Society Interface, Vol. 4, Issue. 16, p. 767.

CrossRef

Google Scholar

VAGENAS, D. BISHOP, S. C. and KYRIAZAKIS, I. 2007. A model to account for the consequences of host nutrition on the outcome of gastrointestinal parasitism in sheep: logic and concepts. Parasitology, Vol. 134, Issue. 09, p. 1263.

CrossRef

Google Scholar

Stear, M.J. Belch, A. Donskow-Schmelter, K. Fitton, L.A. Innocent, G.T. Ishikane, C. Mateus, A. Murphy, L. Rennie, K. Smith, A. and Sayers, G. 2007. Detection of genes with moderate effects on disease resistance using ovine mhc and resistance to nematodes as an example. Veterinary Immunology and Immunopathology, Vol. 120, Issue. 1-2, p. 3.

CrossRef

Google Scholar

CRAIG, B. H. TEMPEST, L. J. PILKINGTON, J. G. and PEMBERTON, J. M. 2008. Metazoan-protozoan parasite co-infections and host body weight in St Kilda Soay sheep. Parasitology, Vol. 135, Issue. 04,

CrossRef

Google Scholar

Kotze, Andrew C. Kopp, Steven R. and Bethony, Jeffrey 2008. The Potential Impact of Density Dependent Fecundity on the Use of the Faecal Egg Count Reduction Test for Detecting Drug Resistance in Human Hookworms. PLoS Neglected Tropical Diseases, Vol. 2, Issue. 10, p. e297.

CrossRef

Google Scholar

Beraldi, D. Craig, B.H. Bishop, S.C. Hopkins, J. and Pemberton, J.M. 2008. Phenotypic analysis of host–parasite interactions in lambs infected with Teladorsagia circumcincta. International Journal for Parasitology, Vol. 38, Issue. 13, p. 1567.

CrossRef

Google Scholar

Cabaret, J. Benoit, M. Laignel, G. and Nicourt, C. 2009. Current management of farms and internal parasites by conventional and organic meat sheep French farmers and acceptance of targeted selective treatments. Veterinary Parasitology, Vol. 164, Issue. 1, p. 21.

CrossRef

Google Scholar

Kidane, Alemayehu Houdijk, Jos G.M. Tolkamp, Bert J. Athanasiadou, Spiridoula and Kyriazakis, Ilias 2009. Consequences of infection pressure and protein nutrition on periparturient resistance to Teladorsagia circumcincta and performance in ewes. Veterinary Parasitology, Vol. 165, Issue. 1-2, p. 78.

CrossRef

Google Scholar

STEAR, M. J. BOAG, B. CATTADORI, I. and MURPHY, L. 2009. Genetic variation in resistance to mixed, predominantlyTeladorsagia circumcinctanematode infections of sheep: from heritabilities to gene identification. Parasite Immunology, Vol. 31, Issue. 5, p. 274.

CrossRef

Google Scholar

MURPHY, L. ECKERSALL, P. D. BISHOP, S. C. PETTIT, J. J. HUNTLEY, J. F. BURCHMORE, R. and STEAR, M. J. 2010. Genetic variation among lambs in peripheral IgE activity against the larval stages of Teladorsagia circumcincta. Parasitology, Vol. 137, Issue. 08, p. 1249.

CrossRef

Google Scholar

COLTHERD, JENNIFER C. BABAYAN, SIMON A. BÜNGER, LUTZ KYRIAZAKIS, ILIAS ALLEN, JUDITH E. and HOUDIJK, JOS G. M. 2011. Interactive effects of protein nutrition, genetic growth potential and Heligmosomoides bakeri infection pressure on resilience and resistance in mice. Parasitology, Vol. 138, Issue. 10, p. 1305.

CrossRef

Google Scholar

Laurenson, Yan Christian Stephen Mountfort Kyriazakis, Ilias Forbes, Andrew Barnet and Bishop, Stephen Christopher 2012. Exploration of the epidemiological consequences of resistance to gastro-intestinal parasitism and grazing management of sheep through a mathematical model. Veterinary Parasitology, Vol. 189, Issue. 2-4, p. 238.

CrossRef

Google Scholar

Skallerup, Per Nejsum, Peter Jørgensen, Claus B. Göring, Harald H.H. Karlskov-Mortensen, Peter Archibald, Alan L. Fredholm, Merete and Thamsborg, Stig M. 2012. Detection of a quantitative trait locus associated with resistance to Ascaris suum infection in pigs. International Journal for Parasitology, Vol. 42, Issue. 4, p. 383.

CrossRef

Google Scholar

Williams, Andrew R. and Palmer, Dieter G. 2012. Interactions between gastrointestinal nematode parasites and diarrhoea in sheep: Pathogenesis and control. The Veterinary Journal, Vol. 192, Issue. 3, p. 279.

CrossRef

Google Scholar

Fishpool, F. J. Kahn, L. P. Tucker, D. J. Nolan, J. V. and Leng, R. A. 2012. Voluntary intake of a medicated feed block by grazing sheep is increased by gastrointestinal nematode infection. Animal Production Science, Vol. 52, Issue. 12, p. 1136.

CrossRef

Google Scholar

Abuargob, O. and Stear, M.J. 2014. Differences between female and castrated male lambs in susceptibility to natural, predominantly Teladorsagia circumcincta infection. Veterinary Parasitology, Vol. 205, Issue. 3-4, p. 588.

CrossRef

Google Scholar

Download full list

Google Scholar Citations

View all Google Scholar citations for this article.

Scopus Citations

View all citations for this article on Scopus

Volume 121, Issue 4
October 2000 , pp. 435-440

The use of a gamma-type function to assess the relationship between the number of adult Teladorsagia circumcincta and total egg output

S. C. BISHOP ^(a1) and M. J. STEAR ^(a2)

- DOI: https://doi.org/10.1017/S0031182099006526
- Published online by Cambridge University Press: 09 November 2000

This article has been cited by the following publications. This list is generated based on data provided by CrossRef.

The use of a gamma-type function to assess the relationship between the number of adult Teladorsagia circumcincta and total egg output

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The use of a gamma-type function to assess the relationship between the number of adult Teladorsagia circumcincta and total egg output

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