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The incidence of goitre in newborn lambs from ewes fed fodder radish, rape or Italian ryegrass with or without iodine supplementation

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dc.contributor.author Judson, H. G. en
dc.contributor.author Barrell, Graham K. en
dc.date.accessioned 2017-09-08T00:46:38Z
dc.date.issued 2011 en
dc.identifier.uri https://hdl.handle.net/10182/8552
dc.description.abstract Brassicas 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.format.extent 66-70 en
dc.language.iso en en
dc.publisher New Zealand Society of Animal Production en
dc.relation The original publication is available from - New Zealand Society of Animal Production - http://www.nzsap.org/proceedings/2011/incidence-goitre-newborn-lambs-ewes-fed-fodder-radish-rape-or-italian-ryegrass-or en
dc.rights Copyright © The Authors & NZSAP. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ en
dc.source 2011 Annual Conference of the New Zealand Society of Animal Production en
dc.subject brassicas en
dc.subject ewe en
dc.subject pregnancy en
dc.subject thyroid en
dc.subject goitrogens en
dc.title The incidence of goitre in newborn lambs from ewes fed fodder radish, rape or Italian ryegrass with or without iodine supplementation en
dc.type Conference Contribution - Published
lu.contributor.unit Lincoln University en
lu.contributor.unit Faculty of Agriculture and Life Sciences en
lu.contributor.unit Department of Agricultural Sciences en
dc.subject.anzsrc 0702 Animal Production en
dc.relation.isPartOf Proceedings of the New Zealand Society of Animal Production en
pubs.finish-date 2011-07-01 en
pubs.organisational-group /LU
pubs.organisational-group /LU/Agriculture and Life Sciences
pubs.organisational-group /LU/Agriculture and Life Sciences/AGSC
pubs.publication-status Published en
pubs.publisher-url http://www.nzsap.org/proceedings/2011/incidence-goitre-newborn-lambs-ewes-fed-fodder-radish-rape-or-italian-ryegrass-or en
pubs.start-date 2011-06-29 en
pubs.volume 71 en
dc.rights.licence Attribution-NonCommercial-NoDerivatives en
lu.subtype Conference Paper en


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