Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/22326
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dc.contributor.authorDever, M Len
dc.contributor.authorKahn, Lewisen
dc.contributor.authorDoyle, Emmaen
dc.date.accessioned2018-01-12T11:25:00Z-
dc.date.issued2015-
dc.identifier.citationVeterinary Parasitology, 209(1-2), p. 76-83en
dc.identifier.issn1873-2550en
dc.identifier.issn0304-4017en
dc.identifier.urihttps://hdl.handle.net/1959.11/22326-
dc.description.abstractThis experiment tested the hypothesis that persistent challenge with anthelmintic susceptible Trichostrongylus colubriformis and Haemonchus contortus larvae would not affect growth of grazing, meat-breed lambs when suppressively treated with anthelmintics. The experiment was a 2. Ã . 2 factorial design using 6-7 months old White Suffolk X Border Leicester/Merino (meat-breed) lambs which were either infected with 2000 T. colubriformis and 300 H. contortus L3/week (IF) or remained uninfected (UIF) for 9 weeks and were either treated (TX) with a combination of short and long-acting anthelmintics or remained untreated (UTX). Lambs grazed as one flock and were rotated between paddocks to avoid autoinfection from pasture. Lambs were humanely euthanised on day 63 and the abomasum and small intestine collected to determine total worm burdens and tissue antibody response specific to T. colubriformis. As expected, worm egg count (WEC) and worm burden were significantly higher in IF UTX lambs (. p<. 0.001). WEC was dominated by H. contortus and peaked at 2325. epg on day 63 but remained at zero for the other treatment groups for the duration of the experiment. Tissue antibody responses were evident in IF lambs (titres; 9982 vs 2767, p=. 0.012) but treatment had no effect (titres; 5912 vs 5349, p=. 0.829). Lambs grew an average of 2.6. kg during the experiment with no difference between IF TX and UIF TX groups (. p=. 0.432). Elevated tissue antibody responses were not associated with differences in growth. Results from this experiment support the hypothesis that persistent larval challenge with anthelmintic susceptible H. contortus and T. colubriformis will not affect growth of grazing, meat-breed lambs when suppressively treated with effective anthelmintics. Therefore the use of sheep suppressively treated with effective anthelmintics appears to be a valid substitute for gastrointestinal nematode-free lambs in field experiments.en
dc.languageenen
dc.publisherElsevier BVen
dc.relation.ispartofVeterinary Parasitologyen
dc.titlePersistent challenge with Trichostrongylus colubriformis and Haemonchus contortus larvae does not affect growth of meat-breed lambs suppressively treated with anthelmintics when grazingen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.vetpar.2015.02.009en
dc.subject.keywordsVeterinary Parasitologyen
local.contributor.firstnameM Len
local.contributor.firstnameLewisen
local.contributor.firstnameEmmaen
local.subject.for2008070708 Veterinary Parasitologyen
local.subject.seo2008960403 Control of Animal Pests, Diseases and Exotic Species in Farmland, Arable Cropland and Permanent Cropland Environmentsen
local.profile.schoolOffice of Faculty of Science, Ag, Business and Lawen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.emaillkahn3@une.edu.auen
local.profile.emailedoyle3@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-chute-20171018-095839en
local.publisher.placeNetherlandsen
local.format.startpage76en
local.format.endpage83en
local.identifier.scopusid84926262571en
local.peerreviewedYesen
local.identifier.volume209en
local.identifier.issue1-2en
local.contributor.lastnameDeveren
local.contributor.lastnameKahnen
local.contributor.lastnameDoyleen
dc.identifier.staffune-id:lkahn3en
dc.identifier.staffune-id:edoyle3en
local.profile.orcid0000-0002-3679-4530en
local.profile.orcid0000-0002-5255-2187en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:22515en
local.identifier.handlehttps://hdl.handle.net/1959.11/22326en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitlePersistent challenge with Trichostrongylus colubriformis and Haemonchus contortus larvae does not affect growth of meat-breed lambs suppressively treated with anthelmintics when grazingen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorDever, M Len
local.search.authorKahn, Lewisen
local.search.authorDoyle, Emmaen
local.uneassociationUnknownen
local.identifier.wosid000353607900007en
local.year.published2015en
local.subject.for2020300909 Veterinary parasitologyen
local.subject.seo2020180602 Control of pests, diseases and exotic species in terrestrial environmentsen
Appears in Collections:Journal Article
School of Environmental and Rural Science
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