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    Relationship between parameters of the glucose tolerance test (GTT) in young sires and their estimated breeding value (EBV) (2001)

    Art
    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Autoren
    Panicke, L.
    Staufenbiel, R.
    Fischer, E.
    Quelle
    Czech journal of animal science; 46 — S. 145–151
    ISSN: 0044-4847
    Sprache
    Englisch
    Kontakt
    Klinik für Klauentiere

    Königsweg 65
    Gebäude 26
    14163 Berlin
    +49 30 838 62261
    klauentierklinik@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    The intravenous glucose tolerance test (GTT) was carried out in 6 breeding stations using 411 bulls of the German Holstein breed shortly after infusion of 1 g glucose/kg0.75 (40% glucose solution) in the animals. Measurement of insulin response led to a heritability coefficient (h2) of 0.07±0.07 to 0.20±0.12, whereas the basic concentration of insulin did not demonstrate any genetic determination. The half life of glucose (GHWZ) and the maximum insulin levels was influenced by age. Calculated correlations for the younger bulls in their third half-year of life showed that the glucose half life and glucose area equivalent are suitable parameters for yield performance. And correlation coefficients indicated that glucose half life is a good parameter for estimating predicted yield, although the glucose concentration is controlled by insulin. Parameters of GTT and estimated breeding values were found to be more closely related, having a correlation coefficient of r=-0.5, in comparison to the relation between pedigree breeding value and GTT