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dc.contributor.authorJudson, H. G.en
dc.contributor.authorBarrell, Graham K.en
dc.description.abstractBrassicas are an important forage species on many New Zealand sheep farms. However, glucosinolates present in some brassicas can cause iodine deficiency in lambs when pregnant ewes are fed such crops during gestation. To investigate the effect of differences in glucosinolate profile of fodder radish and a brassica on ewe thyroid function and incidence of goitre in lambs born to ewes grazing these crops during pregnancy, a 3 x 2 factorial study utilising three diets (Italian ryegrass, fodder radish, rape) and two rates of iodine (I) supplementation (with, without) was conducted. Thyroid hormone (T₃, T₄) response to a thyroid releasing factor (TRF) challenge in ewes and incidence of goitre in newborn lambs was determined. A mild goitre, based on thyroid weight:lamb weight ratio (g/kg) of >0.4, was recorded only in newborn lambs from ewes fed rape and the incidence was higher (75% vs 11%) in those without I supplementation. Pregnant ewes grazing radish or rape had the lowest T₃ and T₄ responses to TRF, except in the case of T₄ where there had been I supplementation. Differences in glucosinolate content and composition may explain the differing results for sheep fed radish or rape.en
dc.publisherNew Zealand Society of Animal Productionen
dc.relationThe original publication is available from - New Zealand Society of Animal Production -
dc.rightsCopyright © The Authors & NZSAP. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.en
dc.source2011 Annual Conference of the New Zealand Society of Animal Productionen
dc.titleThe incidence of goitre in newborn lambs from ewes fed fodder radish, rape or Italian ryegrass with or without iodine supplementationen
dc.typeConference Contribution - Published
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Agricultural Sciencesen
lu.contributor.unitResearch Management Officeen
lu.contributor.unit/LU/Research Management Office/2018 PBRF Staff groupen
dc.subject.anzsrc0702 Animal Productionen
dc.relation.isPartOfProceedings of the New Zealand Society of Animal Productionen
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/AGSC
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group
lu.subtypeConference Paperen

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