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    Suitability of physiological traits of young cattle for the evaluation of their performance stability (2001)

    Art
    Vortrag
    Autoren
    Panicke, L.
    Staufenbiel, R.
    Fischer, E.
    Kongress
    Joint meeting of the AMERICAN DAIRY SCIENCE SOCIETY, AMERICAN MEAT SCIENCE ASSOCIATION, AMERICAN SOCIETY F ANIMAL SCIENCE, POULTRY SCIENCE ASSOCIATION
    Indianapolis (USA), 24. – 28.07.2001
    Quelle
    Abstr. in: Journal of dairy science 84, 2001, Suppl. 1
    — S. 410–No. 1702
    Sprache
    Englisch
    Kontakt
    Klinik für Klauentiere

    Königsweg 65
    Gebäude 26
    14163 Berlin
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    email:klauentierklinik@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    High milk performance connected with sound health regarding metabolism and sufficient fertility in dairy cows depends on a well bal-
    anced distribution of energy in the body.The concentration of glucose in the blood is relatively constant. Enzymes, hormones, controlling proteins and transporters contribute to the enormous synthesis production
    of 3 to 4 kg glucose.These are capable of in fluencing the efficiency of
    glucose production and distribution.Glucose and growth hormone as
    “early predictors ”are superior to other possible parameters such as free
    fat acids,urea,thyroxin,prolactin,somatropin and IGF-1 in compar-
    ing the relationship between physiological metabolic parameters and the
    performance of cows and sires.Insulin plays an outstanding role based
    on its central position in energy metabolism.The function of insulin may
    be recorded by means of the intravenous glucose tolerance test (GTT).
    The reaction of insulin and glucose was investigated after infusion of
    1 g glucose per kg 0 .75 because of the probable genetic determination
    of the reactive ability.The coe .cient of heritability was estimated as
    h 2 =0.28 ±0.16.The metabolic reaction for young cattle was the same
    for females and males as the GTT-parameters basic concentration of
    glucose was 4.0,4.2 and 4.1 nmol/l plasma and the glucose half-life was
    51.0,49.2 and 50.3 minutes for heifers (n=22)and young sires (n=20,
    n=87),respectively.The di .erences of insulin and glucose show a con-
    trary course and depend on the age under standardized feeding.The
    correlation between GTT and o .spring breeding value (EBV)is also in-
    .uenced by the age (in half-life years).The best correlation is read at
    the 3rd half-year.Three independent groups of 24 and 28 young sires
    and 12 heifers were involved in the investigation.The correlation coe .-
    cients between the glucose half-life (GHWZ)and the o .spring breeding
    value (EBV)of about -0.4 to -0.5 are higher compared to the pedigree
    breeding value (PBV).If the so far achieved results are con .rmed,an
    additional recommendation for the evaluation of breeding bulls before
    the start of the progeny test could be given.The test capacity could be
    extended or costs for testing bulls could be lowered