Trends in Genetic Parameter Estimates for Ultrasound Back Fat and Rump Fat Thickness Measures in Angus Bulls and Heifers

dc.contributor.author Hassen, Abebe
dc.contributor.author Tait, Richard
dc.contributor.author Wilson, Doyle
dc.contributor.author Rouse, Gene
dc.contributor.author Tait, Richard
dc.date 2018-08-25T22:46:24.000
dc.date.accessioned 2020-06-29T23:28:29Z
dc.date.available 2020-06-29T23:28:29Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.issued 2004-01-01
dc.description.abstract <p>The objective of the current study was to evaluate heritability and repeatability of serially measured ultrasound 12–13th rib fat thickness (UBF) and rump fat thickness (URF) measures in purebred Angus bulls and heifers.Data included 5000 observations from 912 bulls and heifers.Results from multiple trait analysis showed h2 of 0.29 and 0.40 for yearling UBF and URF, respectively.However, the difference in h2 estimates between yearling measures based on random regression models was smaller.At one year of age, h2 of URF was 0.37 as compared to 0.33 for UBF.Heritability and repeatability values were at their optimum at one year of age. Therefore, yearling bull and 13 to 14 months old heifer ultrasound subcutaneous fat thickness measures from good quality images can be used to evaluate genetic potential of next generation parents in Angus cattle.Information from URF measures may not have an apparent advantage in terms of improving rate of genetic change in percentage retail product in yearling Angus cattle than what could be achieved through selecting against 12th and 13th rib fat thickness.</p>
dc.identifier archive/lib.dr.iastate.edu/ans_air/vol650/iss1/27/
dc.identifier.articleid 1027
dc.identifier.contextkey 3310915
dc.identifier.doi https://doi.org/10.31274/ans_air-180814-453
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ans_air/vol650/iss1/27
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/8118
dc.language.iso en
dc.relation.ispartofseries Animal Science Research Reports
dc.source.bitstream archive/lib.dr.iastate.edu/ans_air/vol650/iss1/27/AS1868.pdf|||Fri Jan 14 23:04:36 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Beef Science
dc.subject.keywords ASL R1868
dc.title Trends in Genetic Parameter Estimates for Ultrasound Back Fat and Rump Fat Thickness Measures in Angus Bulls and Heifers
dc.type article
dc.type.genre beef
dspace.entity.type Publication
relation.isAuthorOfPublication 87b905df-0ec5-436c-b54a-54a44503da6c
relation.isJournalIssueOfPublication 3f2790ae-9c11-4703-87e0-39b318362bbc
relation.isSeriesOfPublication 7f3839b7-b833-4418-a6fa-adda2b23950a
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