Practical uses of ultrasound in early pregnancy in cattle
Hughes, E.A.; Davies, D.A.
Veterinary Record 124(17): 456-458
1989
ISSN/ISBN: 0042-4900 PMID: 2658298 Document Number: 337045
Using a 'real-time' ultrasound scanner with a 3.5 MHz rectal transducer, 80 Friesian cows were scanned at weekly intervals during early pregnancy to assess the accuracy of pregnancy diagnosis, and the accuracy of twin detection. The growing fetuses were also measured to determine the relationship between crown-rump length and age. The accuracy of detection of pregnancy was inversely proportional to the age of the cow, the accuracy of detection of twinning was 100% and there was a strong correlation between fetal crown-rump length and age.