Fachbereich Veterinärmedizin



    The effect of bovine subclinical endometritis after insemination on first service conception rate (2007)

    Kaufmann, T. B.
    Drillich, M.
    Tenhagen, B. A.
    Forderung, D.
    Heuwieser, W.
    40th Annual Conference of Physiology and Pathology of Reproduction and 32nd Mutual Conference on Veterinary and Human Reproductive Medicine
    Berlin, 22. – 23.02.2007
    Reproduction in Domestic Animals, 42, Suppl. 1 (2007), 14
    Tierklinik für Fortpflanzung

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    Abstract / Zusammenfassung

    The objective of the study was to investigate the occurrence
    of bovine subclinical endometritis four hours after artificial
    insemination (A.I.) and its effect on first service conception
    rate (FSCR). A total of 169 Holstein-Friesian cows with no
    clinical signs of endometritis at A.I. were enrolled. All cows
    were examined four hours after first A.I. Endometrial
    samples were collected from the uterus by using the
    Cytobrush technique. The presence of polymorphonuclear
    cells (PMN) was indicative of subclinical endometritis.
    Animals were categorized into 3 groups according to the
    proportion of PMN in the endometrial sample: 0 % PMN
    (n=90), 1-15 % PMN (n=53) and >15 % PMN (n=26). The
    overall FSCR was 44.4 %. Binary logistic regression was
    used to analyse the odds of pregnancy at first service.
    Variables included in the model were parity
    (primiparous/multiparous) and PMN group. Cows in
    Group 1-15 % PMN (FSCR 62.3 %) had significantly
    higher odds of conception (OR = 3.8 and 2.4, respectively)
    than cows in Groups >15 % PMN (FSCR 26.9 %) and 0 %
    PMN (FSCR 38.9 %). The difference between the latter
    groups was not significant. In conclusion, based on our
    findings, subclinical endometritis diagnosed four hours after
    insemination does occur. The findings indicate that a
    moderate elevation of the proportion of PMN (1-15 %
    PMN) four hours after A.I. favoured conception. No PMN
    reaction at A.I. (0 % PMN) or strongly elevated percentages
    of PMN (>15 % PMN) increased the risk of conception
    failure. Further research is required to determine the
    physiological level of PMN-reaction to A.I. in cattle.