Related Experiment Videos
Summary
Umbilical cord clamping in cattle causes fetal anoxia, leading to death in most fetuses after 6-8 minutes. This study examines the physiological responses and outcomes of fetal anoxia in Herefore cattle.
Area of Science:
- Veterinary Medicine
- Fetal Physiology
- Bovine Reproduction
Background:
- Fetal anoxia is a critical concern in bovine obstetrics.
- Understanding fetal response to oxygen deprivation is vital for improving calf survival rates.
Purpose of the Study:
- To investigate the effects of umbilical cord clamping on fetal Hereford cattle.
- To analyze the physiological and acid-base changes in fetuses subjected to anoxia.
- To determine the survival limits of Hereford fetuses under anoxic conditions.
Main Methods:
- Laparohysterotomies were performed on 18 plurigravid Hereford cattle under local analgesia.
- Umbilical cord clamping was applied for durations of 4, 6, or 8 minutes.
- Fetal blood-gas and acid-base status were monitored during anoxia.
- Post-mortem examinations were conducted on non-surviving fetuses.
Main Results:
- Fetuses survived 4 minutes of anoxia, but 6-8 minutes of clamping resulted in death for most.
- Anoxia caused a decline in fetal pH, pO2, and standard bicarbonate, with increased pCO2, lactate, and base deficit.
- Physiological responses included fetal movement, meconium release, and altered pulse rate.
- Post-mortem findings revealed widespread hemorrhages, particularly in the heart, thymus, and spleen.
Conclusions:
- Prolonged umbilical cord clamping (≥6 minutes) is lethal to Hereford fetuses.
- Anoxia induces significant metabolic acidosis and physiological distress in fetuses.
- Hemorrhagic lesions are a consistent post-mortem indicator of severe fetal anoxia.