Correlation between fetal age and ultrasonographic measurements during the second half of pregnancy in domestic cats (Felis catus)

Ultrasonographic and progesterone changes during Days 21 to 63 of pregnancy in queens

“…Zambelli et al [12] observed a high correlation between the fetal manual measurement and the ultrasonographic measurements of the external diameter of the GS and the length of the embryos/fetuses during the first 30 days of gestation. In addition, 2 years later, Zambelli et al [14] found a correlation between fetal measurements and gestational age during the second half of pregnancy.…”

“…Although several researchers have done many ultrasonography studies on queen pregnancy, to our knowledge, there are no thorough studies during the last two-thirds of gestation [10,[12][13][14][15][16][17][18]. In 1986, Davidson et al [10] described a considerable variability in the diameters of the gestational sacs (GSs) and the lengths of fetal poles among individual fetuses within a litter, as well as between litters [10].…”

Accuracy of the prediction of parturition date through ultrasonographic measurement of fetal parameters in the queen

“…The growth of some extra-fetal and fetal structures has been recently studied in the cat (Zambelli et al 2002(Zambelli et al , 2004. The parameters significantly related with gestational age were the diameter of inner chorionic cavity (ICC) and the crown-rump length in the first half of pregnancy (Zambelli et al 2002).…”

“…The parameters significantly related with gestational age were the diameter of inner chorionic cavity (ICC) and the crown-rump length in the first half of pregnancy (Zambelli et al 2002). The biparietal diameter (BP), the gastric diameter and the abdominal diameter in the second half of pregnancy were relevant (Zambelli et al 2004). There is no data available on the accuracy of predicting parturition through these parameters in the queen.…”

Use of positive reinforcement conditioning to monitor pregnancy in an unanesthetized snow leopard (Uncia uncia) via transabdominal ultrasound

“…Additional data would allow the estimation of fetal age based on fetal measurements, which could be useful determining the date of parturition in animals where the date of conception is unknown. Previous studies in hyenas and domestic cats have indicated that fetal growth curves can be created and used as an accurate estimation of gestational age [Place et al, 2002;Zambelli et al, 2004].…”