Fachbereich Veterinärmedizin



    Untersuchungen zur Bewertung und Beeinflussung von Geburten bei Mutterkühen (2002)

    Kämmerling, Jens
    Berlin, 2002 — 114 Seiten
    Tierklinik für Fortpflanzung

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    Abstract / Zusammenfassung

    The reorganization of the agricultural sector and the introduction of a milk quota in the EU has lead to an increased importance of beef cattle farming in recent years. Its profitability, however, depends heavily on viable calf. Therefore, the course of parturition is more important in beef cattle farming than in dairy farming.Stress plays a central role in functional dystocia. It causes the release of adrenalin and thereby reduces uterine contractions via the beta adrenergic receptor. Together with the analysis of the course of parturition in a beef cattle farm and the correlation of limb measurements with calf weight, the influence of stress modifying drugs on the course of parturition was a focus of this work.Out of the 524 investigated births, 12.6 % needed assistance. 33.3 % were caused by fetal malpresentation, position or ^posture and 25.8 % by priamary maternal inertia. In 56.1 % of the cases, little traction was needed, in 18.2 % forced traction and in 13.6 % correction of fetal malpresentation, -position or -posture were applied as therapeutic means.The weight and the perimeter of the fetlocks and shanks of 288 calves of mixed race were measured shortly after birth. The weight and fetlock perimeter measurement resulted in a correlation coefficient of r % 0.83. The weight and shank perimeter lead to a coefficient of r =0.76The influence of drugs on the process of birth was investigated in two situations. As a paradigm of stress, 157 cows were driven inside calfing pen., after initiation of birth. The influence of intramuscularly injected beta Adrenoreceptor inhibitor Carazolol (80 animals) versus placebo injection (77 animals) was tested. An influence on the course of parturition and puerperium and a change in calf"s viability could not be detected. The average duration of birth was 38.5 (treated) versus 38.6 (control) minutes.If the birth did not proceed 1 hour after the rupture of the allantois, the animals were treated with 5 mg/animal Carazolol (16 animals), with 0,35 mg/animal Carbetocin (17 animals-), with 400 mg/animal Denaverinhydrochloride (15 animals) or with mock injections. The onset of labour was significantly more often induced with Carbetocin (94.1 %) in contrast to Carazolol (43.8 %) Denaverinhydrochlorid (53.3) % or sham treatments (56.3 %).The lack of effectiveness of Carazolol is explained by a tributary contribution of stress-induced adrenalin release due to birth complications. Adrenalin release shows wide individual variability. Therefore Carazolol is not recommended as routine application for prophylaxis of delayed parturition as well as for reinitiating of labour. The long-active Oxytocin Carbetocin in contrast to Carazolol as well as the myotrope spasmolytikum Denaverinhydrochloride showed strong reinitiation of labour.