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dc.contributor.authorBishop, S.C.
dc.contributor.authorBairden, K.
dc.contributor.authorMcKellar, Quintin
dc.contributor.authorPark, M.
dc.contributor.authorStear, M.J.
dc.date.accessioned2013-06-17T13:45:44Z
dc.date.available2013-06-17T13:45:44Z
dc.date.issued1996-12
dc.identifier.citationBishop , S C , Bairden , K , McKellar , Q , Park , M & Stear , M J 1996 , ' Genetic parameters for faecal egg count following mixed, natural, predominantly Ostertagia circumcinta infection and relationships with live weight in young lambs ' , Animal Science , vol. 63 , no. 3 , pp. 423-428 . https://doi.org/10.1017/S1357729800015319
dc.identifier.issn1748-748X
dc.identifier.otherPURE: 1426567
dc.identifier.otherPURE UUID: dd6d69d6-d395-4064-8c07-2a35b385bdcd
dc.identifier.otherBibtex: urn:02c149c8dbd962c4e02140d42d0a1e2b
dc.identifier.otherScopus: 0030526962
dc.identifier.urihttp://hdl.handle.net/2299/10793
dc.description.abstractFaecal egg counts and live weights were measured on approximately 200 predominantly twin-born Scottish Blackface lambs each year for 3 years, from 2 to 6 months of age. Measurements were made at 4-week intervals following anthelmintic treatment. Heritability estimates (with s.e.s) of log transformed faecal egg count at each age were 0.01, 0.00, 0.12 (0.10), 0.14 (0.12), 0.15 (0.07) and 0.22 (0.13), for ages 1 to 6 months respectively. Therefore, genetic variation exists for acquired but apparently not for innate resistance to infection. Maternal common environmental effects (with s.e.s) were 0.36 (0.11), 0.20 (0.05), 0.27 (0.09), 0.06 (0.08), 0.15 (0.09) and 0.16 (0.08), for ages 2 to 6 months respectively. Genetic correlations between faecal egg counts in lambs older than 3 months were not significantly less than 1.0, indicating that faecal egg counts at different ages are expressions of the same trait. Phenotypic correlations between faecal egg counts were generally positive but small. Measurement error contributed one-third of the observed variation for individual egg counts. The heritability of mean faecal egg count from 3 to 6 months was 0.33 (s.e. 0.15), indicating that selection decisions can be made more accurately using multiple egg counts per animal. Phenotypic correlations between faecal egg counts and live weight were generally negative but close to zero. However, genetic correlations between faecal egg counts and live weight in lambs older than 3 months were close to -1.0, indicating that resistance to gastrointestinal parasites may be an important genetic determinant of growth rate in this environment.en
dc.format.extent6
dc.language.isoeng
dc.relation.ispartofAnimal Science
dc.subjectfaecal egg counts
dc.subjectgenetic parameters
dc.subjectlive weight
dc.subjectOstertagia
dc.subjectsheep
dc.titleGenetic parameters for faecal egg count following mixed, natural, predominantly Ostertagia circumcinta infection and relationships with live weight in young lambsen
dc.contributor.institutionOffice of the Vice-Chancellor
dc.contributor.institutionVeterinary Science
dc.contributor.institutionGeography, Environment and Agriculture
dc.description.statusPeer reviewed
dcterms.dateAccepted1996-12
rioxxterms.versionofrecordhttps://doi.org/10.1017/S1357729800015319
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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