Non-linear model analysis of categorical traits related to female reproduction efficiency in beef cattle

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dc.contributor.authorRust, T.en_ZA
dc.contributor.authorSchoeman, S. J.en_ZA
dc.contributor.authorVan Der Westhuizen, J.en_ZA
dc.contributor.authorVan Wyk, J. B.en_ZA
dc.date.accessioned2011-05-15T15:54:38Z
dc.date.available2011-05-15T15:54:38Z
dc.date.issued2009
dc.descriptionCITATION: Rust, T., et al. 2009. Non-linear model analysis of categorical traits related to female reproduction efficiency in beef cattle. South African Journal of Animal Science, 39(4):260-266.
dc.descriptionThe original publication is available at https://www.sasas.co.za/
dc.description.abstractThe utilization of non-linear threshold models and linear animal models to estimate variance components for categorical reproductive traits in beef cattle was investigated. Three traits, retention (RET), stayability (STAY) and calf tempo (CT) were defined. The data set consisted of 36 880 Afrikaner beef cattle measurements recorded over a period of 10 years. After editing, the records of 7 746 females from 473 sires were available for the genetic parameter estimation for RET. The corresponding number of records for STAY and CT were 3 018 (243 sires) and 7 653 (465 sires), respectively. Using GFCAT, sire variances for RET, STAY and CT were estimated as 0.202, 0.072 and 0.114, respectively. With error variances pre-set to one, the heritability estimates on the underlying scale were calculated as 0.67, 0.27 and 0.41 for RET, STAY and CT, respectively. From the three traits analyzed in this study CT probably reflects the true fertility of the bull's female progeny best.
dc.description.urihttps://www.sasas.co.za/journals/non-linear-model-analysis-of-categorical-traits-related-to-female-reproduction-efficiency-in-beef-cattle/
dc.description.versionPublisher's version
dc.format.extent7 pages
dc.identifier.citationRust, T., et al. 2009. Non-linear model analysis of categorical traits related to female reproduction efficiency in beef cattle. South African Journal of Animal Science, 39(4):260-266
dc.identifier.issn0375-1589 (online)
dc.identifier.urihttp://hdl.handle.net/10019.1/9314
dc.language.isoen_ZAen_ZA
dc.publisherSouth African Society for Animal Science
dc.rights.holderSouth African Society for Animal Science
dc.subjectBeef cattle
dc.subjectBeef cattle breeds
dc.titleNon-linear model analysis of categorical traits related to female reproduction efficiency in beef cattleen_ZA
dc.typeArticle
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