From: The vaginal and uterine blood flow changes during the ovsynch program and its impact on the pregnancy rates in Holstein dairy cows
Pregnancy check
parity
Prim-parous
Pleuri-parous
overall
32±3
41.9 (13/31)
45.09 (23/51)
43.9 (36/82)
60±3
32.25 (10/31)
37.2(19/51)
35.37 (29/82)
P value
0.002
0.01
0.001