Relationship between fetal position and stillbirth in the cynomolgus monkeys (Macaca fascicularis): retrospective analysis.
Retrospective analyses were made on the relationship between fetal position and stillbirth, using 703 pregnant cynomolgus monkeys. Incidence of the breech position was 59.1% to 12 weeks of gestation. The rate decreased stepwise to 10.4% on the day before delivery. Twenty-one (65.6%) of 32 monkeys who were in the breech position on the day before delivery had stillbirths, whereas only one stillbirth occurred among 275 monkeys whose fetuses were in the cephalic position.
D000818:Animals; D001946:Breech Presentation; D005260:Female; D005313:Fetal Death; D005318:Fetal Heart / Q000502:physiology; D005865:Gestational Age; D007746:Labor Presentation; D008251:Macaca / Q000502:physiology*; D008252:Macaca fascicularis / Q000502:physiology*; D011247:Pregnancy; D011674:Pulse; D012189:Retrospective Studies; D014463:Ultrasonography