Effects of within herd variation on the relationship between genetic evaluations and performance of offspring

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dc.contributor.authorMeinert, Todd Richarden
dc.contributor.committeechairPearson, Ronald E.en
dc.contributor.committeememberCassell, Bennet G.en
dc.contributor.committeememberVinson, William E.en
dc.contributor.departmentDairy Scienceen
dc.date.accessioned2014-03-14T21:31:31Zen
dc.date.adate2013-03-12en
dc.date.available2014-03-14T21:31:31Zen
dc.date.issued1987-05-12en
dc.date.rdate2013-03-12en
dc.date.sdate2013-03-12en
dc.description.abstract1,032,438 Jersey and 1,162,578 Holstein official Dairy Herd Improvement Association (DHIA) records from 20,380 and 34,000 herd-years, respectively, were used to compute herd-year means and within herd-year standard deviations for individual mature equivalent (ME) milk, fat, and fat percent. These herd-year means and within standard deviations were used to stratify records into five classes. Regressions for individual daughter's modified contemporary deviation (MCD) on sire's predicted difference (PD) were calculated for each class. The within herd-year standard deviations were also used in some of the six different MCD calculations used to compute six different cow indexes (CI) for each cow and trait. The six MCDs calculated were either the current deviation, log adjusted deviation, or the deviation standardized to a constant variance in combination with either the current correction for contemporaries merit or an adjusted correction. The six different CI for each trait were compared by how accurately they predicted the son's MCD trait and the daughter's MCD trait.en
dc.description.degreeMaster of Scienceen
dc.format.extentx, 83 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-03122013-040052en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-03122013-040052/en
dc.identifier.urihttp://hdl.handle.net/10919/41548en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1987.M45.pdfen
dc.relation.isformatofOCLC# 16679388en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1987.M45en
dc.subject.lcshMilk yielden
dc.titleEffects of within herd variation on the relationship between genetic evaluations and performance of offspringen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineDairy Scienceen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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