Fachbereich Veterinärmedizin


Service-Navigation

    Publikationsdatenbank

    Efficacy of a treatment with hCG 4 days after AI to reduce pregnancy losses in dairy cows after synchronized ovulation - Preliminary results (2007)

    Art
    Vortrag
    Autoren
    Fischer-Tenhagen, C.
    Thiele, G.
    Heuwieser, W.
    Tenhagen, B. A.
    Kongress
    40th Annual Conference of Physiology and Pathology of Reproduction and 32nd Mutual Conference on Veterinary and Human Reproductive Medicine
    Berlin, 22. – 23.02.2007
    Quelle
    Reproduction in Domestic Animals, 42, Suppl. 1 (2007), 6
    Verweise
    URL (Volltext): http://www.blackwell-synergy.com/toc/rda/42/s1
    Kontakt
    Tierklinik für Fortpflanzung

    Königsweg 65
    Haus 27
    14163 Berlin
    +49 30 838 62618
    fortpflanzungsklinik@vetmed.fu-berlin.de

    Abstract / Zusammenfassung

    The objective of the study was to investigate, whether a
    treatment with hCG 4 days after AI could reduce pregnancy
    losses in high yielding dairy cows. Non pregnant cows of
    one commercial dairy herd were examined weekly in the
    course of a reproductive management protocol. Cows with
    no corpus luteum (CL) were treated with an Ovsynch
    protocol [0.01mg of buserelin (Receptal®, Intervet
    Deutschland GmbH, Unterschleissheim) on days 0 and 9,
    0.15 mg of cloprostenol (Cyclix®, Intervet Deutschland
    GmbH, Unterschleissheim) on day 7, AI 16 to 20 hrs after
    the second buserelin treatment, Group OV)]. Cows with a
    CL received cloprostenol (0.15 mg) on day 0, buserelin
    (0.01mg) on day 2 and AI 16 to 20 hrs later (Group PG).
    Cows in both treatment protocols were then assigned to two
    groups by their identification number (even vs. odd
    numbers) to receive or not to receive 2,500 IU of hCG i.v.
    four days after AI (Ovogest®, Intervet Deutschland GmbH,
    Groups OV-hCG, OV-Cont, PG-hCG and PG-Cont).
    Pregnancy diagnosis was carried out via ultrasound on day
    27 after AI (n=525) and on day 39 (n=491) by rectal
    palpation. Pregnancy losses were defined as cows being
    pregnant on day 27 but not pregnant on day 39. Pregnancy
    rate (PR) by day 27 did not differ between the four
    treatment groups (27.1, 33.8, 28.9, 29.3 % for Groups OVhCG,
    OV-Cont, PG-hCG and PG-Cont). Pregnancy losses
    between day 27 and day 39 were lower in hCG treated
    animals (23 vs. 40 %, P=0.043). PR on day 39 did not differ
    significantly between groups (21.2, 19.7, 27.2, and 20.7 %
    for Groups OV-hCG, OV-Cont, PG-hCG and PG-Cont). In
    conclusion, treatment with hCG 4 days after AI did not
    significantly increase PR on days 27 and 39 after
    synchronized ovulation and timed AI but reduced pregnancy
    loss during this period. The authors acknowledge the
    support of Intervet Deutschland GmbH.