Table 2 Pearson’s rank correlation coefficients for the relationships between concentrations of estrogen, progesterone and cortisol in serum and peak systolic velocity (PSV), blood flow volume (BFV), time-averaged maximum velocity (TAMV), pulsatility index (PI), resistance index (RI), systolic/diastolic velocity (S/D), and peak velocity (PV) with respect to blood flow through uterine artery (U) based on parameters measured using Doppler ultrasonography (D Parameters) in Holstein cows during the GnRH- PGF2α management program. Bold parameters are R value and reverse bolding indicates P value

P4

1

-0.18

0.94**

-0.17

0.63*

0.66**

0.04

-0.5

-0.49

0.39

P4

0.5

0.000

0.5

0.01

0.007

0.8

0.05

0.05

0.14

E2

-0.18

1

-0.26

0.02

-0.7

-0.38

0.08

0.27

0.05

-0.20

E2

0.5

0.34

0.93

0.1

0.15

0.7

0.31

0.85

0.4

Cortisol

0.94**

-0.26

1

-0.23

0.5

0.77**

0.19

-0.51*

-0.12

0.38

cortisol

0.000

0.34

0.4

0.05

0.001

0.47

0.05

0.65

0.15

U-PSV

-0.17

0.02

-0.23

1

0.14

-0.52*

-0.21

-0.23

0.43

-0.07

U-PSV

0.5

0.93

0.4

0.6

0.04

0.43

0.4

0.1

0.7

U-TAMV

0.63*

-0.7

0.5*

0.14

1

0.9

-0.5

-0.37

0.66**

0.19

U-TAMV

0.01

0.1

0.05

0.61

0.01

0.05

0.1

0.006

0.47

U-BFV

0.66**

-0.38

0.77**

-0.5*

0.9

1

-0.49

-0.34

-0.5*

0.22

U-BFV

0.007

0.15

0.001

0.04

0.01

0.05

0.2

0.61

0.41

U-PI

0.04

0.08

0.19

-0.2

-0.5

-0.49

1

-0.21

-0.85**

0.2

U-PI

0.8

0.75

0.4

0.43

0.05

0.05

0.66

0.00

0.46

U-RI

-0.5

0.27

-0.51*

-0.23

-0.37

-0.34

0.12

1

-0.07

-0.19

U-RI

0.05

0.31

0.05

0.4

0.16

0.2

0.66

0.78

0.48

U-S/D

-0.49

0.05

-0.12

0.43

0.66**

-0.56*

-0.85**

-0.07

1

0.05

U-S/D

0.05

0.85

0.65

0.1

0.006

0.02

0.00

0.7

0.85

U-D

0.39

-0.20

0.38

-0.07

0.19

0.22

0.2

-0.16

-0.05

1

U-D

0.14

0.47

0.15

0.7

0.4

0.4

0.46

0.4

0.8