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    Genetic analysis of reproductive and productive performance of Friesian cattle in Kenya. II. Genetic and phenotypic trends

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    Authors
    Rege, J.E.O.
    Date
    1991
    Language
    en
    Type
    Journal Article
    Accessibility
    Limited Access
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    Citation
    Journal of Animal Breeding and Genetics;108(6):424-433
    Permanent link to cite or share this item: http://hdl.handle.net/10568/28852
    DOI: https://dx.doi.org/10.1111/j.1439-0388.1991.tb00204.x
    Abstract/Description
    The 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.
    AGROVOC Keywords
    FRIESIAN CATTLE; REPRODUCTIVITY; PRODUCTIVITY; GENETIC CHARACTERS; GENOTYPES; PHENOTYPES; MILK YIELD; CALVING INTERVAL; LACTATION; AGE AT FIRST CALVING
    Subjects
    CATTLE; BREEDS; LIVESTOCK; GENETICS;
    Countries
    KENYA
    Regions
    AFRICA; EAST AFRICA
    Collections
    • ILRI archive [4979]
    • ILRI articles in journals [4809]

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