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Table 7 Mean (± SEM) values of Doppler parameters in the umbilical artery during consecutive stages of pregnancy in sheep (n = 16)

From: Ultrasound parameters of early pregnancy and Doppler indices of blood vessels in the placenta and umbilical cord throughout the pregnancy period in sheep

Period of pregnancy

Parameters

PSV (cm/s)

EDV (cm/s)

PSV/EDV

RI

PI

35–50 days

22.69 ± 1.34Aa

0.00A

NO

1.00A

3.01 ± 0.12Aa

55–70 days

22.26 ± 0.74Aa

1.93 ± 023Ba

8.67 ± 0.85a

0.95 ± 0.01A

2.79 ± 0.12Aa

75–90 days

26.15 ± 0.53b

4.25 ± 0.72Bb

9.56 ± 1.57a

0.78 ± 0.08B

1.65 ± 0.09b

95–110 days

27.79 ± 1.23b

6.91 ± 0.66BC

4.60 ± 0.42b

0.76 ± 0.03B

1.48 ± 0.13B

130–145 days

31.24 ± 1.43B

9.07 ± 0.92BC

4.22 ± 0.58b

0.70 ± 0.04B

1.17 ± 0.11B

  1. A, a - indicate that mean values in the rows marked with different alphabets differ at p < 0.01 and p < 0.05, respectively
  2. NO – incalculable value