Table 2. Differences in progesterone concentration according to change in an estrus synchronization program

	Day 0	Day −1
1	0.475	1.360
2	0.079	26.700
3	1.710	1.130
4	0.772	0.237
5	0.586	2.050
6	6.500	8.570
7	3.190	5.900
8	3.370	6.640
9	0.183	2.360
10	0.149	0.507
11	6.540	0.635
12	0.259	2.350
13	NA	3.920
14	NA	8.560
15	NA	1.650
16	NA	10.600
17	NA	1.130
18	NA	0.941
19	NA	0.195
20	NA	0.221
Mean	1.984	4.283
SE	0.694	1.380

NA, not applicable.