Relationship between the timing of the first postpartum ovulation and antral follicle counts in Holstein cows

Table 2 Reproductive results of cows in the high and low AFC groups

Days from parturition to	AFC group	No. of cows	Mean ± SD	Median
First postpartum ovulation	High	10	26.6 ± 10.7^a	27
First postpartum ovulation	Low	13	46.7 ± 25.8^b	42
First postpartum AI^†	High	9	105.8 ± 37.2	95
First postpartum AI^†	Low	12	96.3 ± 23.1	93
Achieving pregnancy^‡	High	6	131.2 ± 29.2	135
Achieving pregnancy^‡	Low	7	97.7 ± 33.0	82

AFC antral follicle count; DIM days in milk; AI artificial insemination
^abValues with different superscripts are significantly different (P < 0.05)
^†Two cows were not inseminated
^‡Days of achieving pregnancy were calculated based on cows conceived by 180 DIM

ISSN: 1757-2215