Genetic parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertility

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dc.contributor.authorDuguma, G.en_ZA
dc.contributor.authorCloete, S. W. P. (Schalk Willem Petrus van der Merwe)en_ZA
dc.contributor.authorSchoeman, S. J.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 parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertility. South African Journal of Animal Science, 32(2):76-82.
dc.descriptionThe original publication is available at https://www.sasas.co.za/
dc.description.abstractGenetic parameter estimates for scrotal circumference (SC), testis diameter (TD) and two-tooth liveweight (LW) were obtained for 1380 two-tooth Merino rams born from 1986 to 1998 on the Tygerhoek Experimental Farm. The effect of SC of service sires (n = 263) on ewe fertility was also investigated. Year of birth, selection group and LW were significant sources of variation for both SC and TD. SC had a significant effect on ewe fertility. Heritability estimates ranged from 0.29 to 0.40, 0.25 to 0.38 and from 0.49 to 0.52 for SC, TD and LW, respectively. Adjustment for LW decreased heritability estimates of SC and TD and the genetic correlations between the latter traits. Rams with an unadjusted SC of less than 30 cm should not be used.
dc.description.urihttps://www.sasas.co.za/journals/genetic-parameters-of-testicular-measurements-in-merino-rams-and-the-influence-of-scrotal-circumference-on-total-flock-fertility/
dc.description.versionPublisher's version
dc.format.extent7 pages
dc.identifier.citationDuguma, G., et al. 2002. Genetic parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertility. South African Journal of Animal Science, 32(2):76-82
dc.identifier.issn1996-7489 (online)
dc.identifier.urihttp://hdl.handle.net/10019.1/9366
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Animal Science
dc.rights.holderSouth African Society for Animal Science
dc.subjectMerino sheep
dc.subjectMouflon
dc.subjectMerino sheep -- Breeding
dc.titleGenetic parameters of testicular measurements in Merino rams and the influence of scrotal circumference on total flock fertilityen_ZA
dc.typeArticle
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