Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/92067
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dc.contributor.authorWalkom, S.en
dc.contributor.authorBrien, F.en
dc.contributor.authorHebart, M.en
dc.contributor.authorFogarty, N.en
dc.contributor.authorHatcher, S.en
dc.contributor.authorPitchford, W.en
dc.date.issued2014en
dc.identifier.citationAnimal Production Science, 2014; 54(6):802-813en
dc.identifier.issn1836-0939en
dc.identifier.issn1836-5787en
dc.identifier.urihttp://hdl.handle.net/2440/92067-
dc.descriptionPublished: 11 April 2014en
dc.description.abstractThe Australian sheep industry has historically made rapid advances in the quality and quantity of meat and wool through genetic improvement, but unfortunately, maternal performance, i.e. number of lambs weaned, is well below desired levels. The aim of the present paper is to investigate the potential to select for increased weight and fat across the production cycle to improve maternal performance. The analysis explores the potential to improve the weight and fat score of breeding ewes during ‘tough’ periods (i.e. when nutrient requirements are not met by the pasture), preparing the breeding ewe for the upcoming mating without an increase in overall ewe size. The 2846 ewes within the maternal central progeny test were weighed and scored for fatness 12 times across three production cycles. Low to moderate heritability estimates for weight (0.04–0.23) and fat (0.02–0.06) changes across the production cycle provide little hope for selection against weight loss during tough periods. The analysis showed very strong genetic correlations between time-points across multiple production cycles for both weight (0.99–0.93) and fat score (0.88–0.98). The very strong correlations between measurements suggest that weight and fat score are genetically the same trait throughout the ewe’s adult life. With 74% and 77% of the genetic variation in weight and fat, respectively, constant across the production cycle, there is little opportunity to select against the natural fluctuations in weight and fat reserves. In conclusion, selection for increased fat can be made at any time and it will result in more fat during tough times.en
dc.description.statementofresponsibilityS. F. Walkom, F. D. Brien, M. L. Hebart, N. M. Fogarty, S. Hatcher and W. S. Pitchforden
dc.language.isoenen
dc.publisherCSIRO Publishingen
dc.rightsJournal compilation © CSIRO 2014en
dc.titleSeason and reproductive status rather than genetics factors influence change in ewe weight and fat over time. 1. Analysis of crossbred ewesen
dc.typeJournal articleen
dc.identifier.doi10.1071/AN13247en
pubs.publication-statusPublisheden
dc.identifier.orcidBrien, F. [0000-0002-4758-4862]en
dc.identifier.orcidHebart, M. [0000-0002-0700-7585]en
dc.identifier.orcidPitchford, W. [0000-0002-5213-3978]en
Appears in Collections:Animal and Veterinary Sciences publications

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