[The uterine motility of cattle during late pregnancy, labor and puerperium. I. Spontaneous motility].
In the present study spontaneous uterine motility was recorded in 4 cows during late pregnancy, parturition and the puerperium using pressure microsensors and electrodes which were surgically implanted into the myometrium of the pregnant horn 3 to 4 weeks before parturition. Hysterograms were evaluated by means of pressure amplitude, frequency, duration, interval of uterine contractions and also by electromyography. During the last 2-3 weeks of pregnancy only single weak uterine contractions of different intensity were seen. About 18-20 hours a.p. frequency and amplitude of mainly tubocervical directed waves continuously increased. When the fetus entered the birth canal and especially during expulsion of the calf extremely strong irregular contractions occurred, which became very regular during the first hours p. p. After the placenta has been released 3-8 hours p. p., spontaneous uterine motility drastically decreased until the second postpartal week, when it started to increase again.
Kündig
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H
Departement für Fortpflanzungskunde der Universität Zürich.
Thun
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R
Zerobin
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K
Bachmann
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B
D000818:Animals; D002417:Cattle / Q000502:physiology*; D004576:Electromyography / Q000662:veterinary; D005260:Female; D007743:Labor, Obstetric / Q000502:physiology*; D049590:Postpartum Period / Q000502:physiology*; D011247:Pregnancy; D011270:Pregnancy, Animal / Q000502:physiology*; D011312:Pressure; D014590:Uterine Contraction / Q000502:physiology*
Die uterusmotorik des rindes während spätgravidität, geburt und puerperium. i. die spontanmotorik.