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dc.contributor.authorRege, J.E.O.
dc.date.accessioned2013-05-06T07:01:34Z
dc.date.available2013-05-06T07:01:34Z
dc.date.issued1991
dc.identifier.citationJournal of Animal Breeding and Genetics;108(6):424-433
dc.identifier.issn0931-2668
dc.identifier.urihttp://hdl.handle.net/10568/28852
dc.description.abstractThe Kenya Livestock Recording Centre progeny testing data base covering the period 1968 through 1987 was used to estimate genetic and phenotypic trends in Friesian cattle for milk yield of all lactations, first lactation milk yield, age at first calving, and calving interval. Annual genetic and phenotypic trends were estimated at 2.5 and 1.2 kg, -5.2 and -5.5 kg, -14.4 and 3.1d, and -.1 and .7d, respectively for these traits. None of these trends was significantly different from zero, except the genetic trend for age at first calving. There were differences in ranking of bulls. This was a possible cause of extensive use of genetically poor bulls at the expense of superior ones. However, high semen demand was the main cause of low genetic progress.
dc.language.isoen
dc.sourceJournal of Animal Breeding and Genetics
dc.subjectKENYA
dc.subjectFRIESIAN CATTLE
dc.subjectREPRODUCTIVITY
dc.subjectPRODUCTIVITY
dc.subjectGENETIC CHARACTERS
dc.subjectGENOTYPES
dc.subjectPHENOTYPES
dc.subjectMILK YIELD
dc.subjectCALVING INTERVAL
dc.subjectLACTATION
dc.subjectAGE AT FIRST CALVING
dc.titleGenetic analysis of reproductive and productive performance of Friesian cattle in Kenya. II. Genetic and phenotypic trends
dc.typeJournal Article
cg.subject.ilriCATTLE
cg.subject.ilriBREEDS
cg.subject.ilriLIVESTOCK
cg.subject.ilriGENETICS
cg.identifier.statusLimited Access
cg.identifier.doihttps://dx.doi.org/10.1111/j.1439-0388.1991.tb00204.x
cg.coverage.regionAFRICA
cg.coverage.regionEAST AFRICA
cg.coverage.countryKENYA


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