ULTRASONOGRAPHIC ASSESSMENT OF PLACENTAL THICKNESS IN DOGS AND ITS RELATIONSHIP WITH GESTATIONAL AGE
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Date
2018-08
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KARNATAKA VETERINARY, ANIMAL AND FISHERIES SCIENCES UNIVERSITY, BIDAR
Abstract
The measurement of gestational sac diameter (GSD) and biparietal diameter
(BPD) using ultrasonography (USG) remained fairly accurate determinants of gestational
age (GA) in canines during early and later stages of gestation with precision of ±1 to ± 2
days. The present study looked at the possibility of placental thickness (PT) as a
determinant of GA using USG in normal pregnancies of different breeds and body sizes
and then to correlate the same with reported gestational age (RGA). A cross sectional
observational study was conducted on 90 pregnant dogs of different breeds and parity and
a total of 112 observations were made by using ALOKA PRO SOUND α-6 ultra sound
unit using 5 MHz convex probe. The dogs were categorised into two groups, namely the
large breeds and small breeds, GA and PT were recorded from 3rd to 4th week of
gestation. The mean PT in small breeds of dogs was found to be 3.42 ± 0.32, 4.20 ± 0.15
and 4.36 ± 0.12 at 36.11 ± 1.19, 46.11 ± 0.71 and 54.84 ± 0.89 average GA, respectively
with a significant positive correlation between PT vs GA and PT vs RGA (r= 0.58 and
0.59), and respective R² of 0.34 and 0.35 was recorded. Similarly, for large breeds mean
PT of 2.91 ± 0.24, 5.28 ± 0.15 and 5.88 ± 0.13 at 33.80 ± 0.81, 44.92 ± 0.66 and 57.18 ±
0.98 days, respectively with significant positive correlation between PT vs GA and PT vs
RGA (r=0.82,0.81) and respective R² of 0.67 and 0.67 was recorded. The present study
revealed that there was no significant difference between the calculated gestational age
(CGA) and reported gestational age (RGA). It was concluded that the placental thickness
(PT) was significantly correlated with GA and RGA and it can be used to estimate
gestational age of foetus along with other parameters like GSD and BPD.