Journal of the American Veterinary Medical Association · 1970 · 14 citations · 0 references
Veterinary MedicineAnimal SciencesObstetricsAcousticsUltrasonographyUltrasoundDoppler UltrasonographyDoppler UltrasoundEarly Pregnancy AssessmentObstetric UltrasonographyPregnancy DiagnosisUltrasonicsBlood FlowPlacental Blood FlowPlacental UltrasoundPregnancy UltrasonographyPrenatal UltrasonographyUltrasonic Doppler Effect
SUMMARY Thirty bred bitches were examined with an ultrasonic Doppler instrument. Fetal heart beat was detected in all bitches more than 32 days pregnant and in one bitch on the 29th day. Sounds thought to be produced by placental blood flow were heard as early as the 25th day. Water-soluble lubricant was found to be a better coupling medium than water.