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

Table 3 Parameters of nutritional status of cows in the high and low AFC groups

Item	AFC group	No. of cows	Mean ± SD
BW change rate^ac (%)	High	9	−3.3 ± 3.9
BW change rate^ac (%)	Low	12	−6.6 ± 5.7
Daily rate of BW changes^bd (kg/day)	High	5	−1.4 ± 0.9
Daily rate of BW changes^bd (kg/day)	Low	10	−1.6 ± 1.5
The average milk yield^e (kg/day)	High	10	26.4 ± 5.7
The average milk yield^e (kg/day)	Low	13	26.2 ± 6.2
The mean peak milk yield^f (kg/day)	High	10	32.0 ± 5.4
The mean peak milk yield^f (kg/day)	Low	13	32.4 ± 7.2

AFC antral follicle count; BW body weight
^a Two cows were not measured their BW at calving
^b Six cows showed nadir BW at calving
^c The BW change rate from calving to the nadir; ((BW at nadir - BW at calving) / BW at calving)
^d Daily rate of BW changes from calving to the nadir
^e The average milk yield was calculated by the milk yield for 17 weeks postpartum
^f The peak milk yield was observed from 2 to 17 weeks postpartum

ISSN: 1757-2215