Genetic parameter estimates of early growth traits in the tygerhoek Merino flock

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dc.contributor.authorDuguma, G.en_ZA
dc.contributor.authorSchoeman, S. J.en_ZA
dc.contributor.authorCloete, S. W. P. (Schalk Willem Petrus van der Merwe)en_ZA
dc.contributor.authorJordaan, G. F.en_ZA
dc.date.accessioned2011-05-15T15:54:43Z
dc.date.available2011-05-15T15:54:43Z
dc.date.issued2002
dc.descriptionCITATION: Duguma, G., et al. 2002. Genetic parameter estimates of early growth traits in the tygerhoek Merino flock. South African Journal of Animal Science, 32(2):66-75.
dc.descriptionThe original publication is available at https://www.sasas.co.za/
dc.description.abstractGenetic parameters were estimated for birth weight (BWT), weaning weight (WWT) and pre-weaning average daily gain (ADG) using Restricted Maximum Likelihood (REML) procedures. Four different animal models were fitted, differentiated by including or excluding maternal effects. The direct heritability estimates (h2) ranged from 0.19 to 0.38, 0.25 to 0.36 and 0.26 to 0.34 for BWT, WWT and ADG, respectively. The estimates were substantially higher when maternal effects, either genetic or environmental, were ignored from the model. The maternal heritability (m2) for BWT was 0.38 when only maternal genetic effects were fitted in the model but decreased to 0.25 when the maternal permanent environmental effect (c2) was fitted. The m2 for WWT and ADG ranged from 0.05 to 0.11 and from 0.04 to 0.10, respectively. The respective c2 estimates ranged from 0.06 to 0.10 and from 0.06 to 0.09. Moderate negative genetic correlations (ram)between direct and maternal genetic effects were observed in BWT, while close to zero estimates were obtained for WWT and ADG. The direct genetic correlation estimates between BWT and WWT and BWT and ADG were 0.16 and 0.04, respectively. The corresponding maternal genetic correlation estimates were 0.93 and 0.60. The direct and maternal genetic correlation estimates between WWT and ADG were 0.99 and 0.85, respectively. It is suggested that selection should be applied to WWT.
dc.description.urihttps://www.sasas.co.za/journals/genetic-parameter-estimates-of-early-growth-traits-in-the-tygerhoek-merino-flock/
dc.description.versionPublisher's version
dc.format.extent10 pages
dc.identifier.citationDuguma, G., et al. 2002. Genetic parameter estimates of early growth traits in the tygerhoek Merino flock. South African Journal of Animal Science, 32(2):66-75
dc.identifier.issn1996-7489 (online)
dc.identifier.urihttp://hdl.handle.net/10019.1/9364
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Animal Science
dc.rights.holderSouth African Society for Animal Science
dc.subjectMerino sheep -- Breeding
dc.subjectMerino sheep
dc.titleGenetic parameter estimates of early growth traits in the tygerhoek Merino flocken_ZA
dc.typeArticle
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