Hemodynamic changes in arterial flow velocities throughout the first six months of pregnancy in buffalo heifers by Doppler ultrasonography

Objective: To assess blood flow parameters as well as Doppler indices at the first six months of pregnancy in buffalo heifers. Methods: A total of 15 healthy, cycling, buffalo heifers were examined twice per month. Examination of Doppler ultrasonography started from the first month till the sixth months of pregnancy. All animals were subjected to transrectal Doppler ultrasonography to assess ovarian and uterine blood flow. Resistance index, pulsatility index, peak systolic velocity, end diastolic velocity, and blood flow rate were measured of both ipsilateral and contralateral to the fetus side. Results: The resistance index was positively correlated with the pulsatility index (r=0.62, P