Table 2.

Descriptive statistics of time intervals between the time of ovulation, automated activity monitor (AAM) alerts, and temperature alerts for estrus and ovulation based on standard deviation changes in rumen-reticular temperature in dairy cows.

Interval	Alerted1 (%; n/n)	Mean time (h)	SD	Minimum	Maximum
AAM alert—temperature estrus alert
0.5 STD	87.9 (167/190)	−4.2	9.0	−12.0	45.3
1 STD	76.8 (146/190)	0.8	11.5	−12.0	69.5
1.5 STD	56.8 (108/190)	2.0	9.5	−12.0	29.2
2 STD	35.3 (67/190)	4.0	10.0	−11.9	33.6
2.5 STD	18.9 (36/190)	4.4	7.2	−11.9	21.3
3 STD	12.1 (23/190)	6.0	8.6	−11.1	29.8
Temperature estrus alert—ovulation
0.5 STD	–	−29.3	12.8	−98.3	1.4
1 STD	–	−24.1	13.4	−98.3	4.9
1.5 STD	–	−22.5	14.1	−98.3	6.5
2 STD	–	−19.8	15.2	−98.3	6.8
2.5 STD	–	−20.5	13.8	−76.9	1.6
3 STD	–	−19.7	16.8	−75.9	6.5
AAM alert—temperature ovulation alert
0.5 STD	85.8 (163/190)	2.7	14.0	−12.0	39.1
1 STD	65.2 (124/190)	9.7	16.9	−12.0	74.2
1.5 STD	33.7 (64/190)	10.4	16.9	−11.8	74.2
2 STD	18.9 (36/190)	13.0	15.1	−10.7	35.5
2.5 STD	10.0 (19/190)	18.1	15.0	−10.7	35.5
3 STD	5.3 (10/190)	21.6	14.2	−10.7	35.5
Temperature ovulation alert—ovulation
0.5 STD	–	−23.1	18.1	−89.6	11.4
1 STD	–	−16.1	18.9	−87.6	11.6
1.5 STD	–	−17.1	20.9	−87.6	10.9
2 STD	–	−13.4	17.3	−50.2	11.6
2.5 STD	–	−9.4	15.3	−35.6	11.6
3 STD	–	−4.3	15.6	−29.5	11.6

Alerts were determined on all data points between 12 h before the AAM estrus alert until 12 h after ovulation. On average, temperature estrus alerts occurred near the time of AAM alerts for estrus, but before ovulation, while temperature ovulation alerts occurred after AAM estrus alerts, and before ovulation.

¹Proportion of AAM estrus alerts which were also alerted based on changes in rumen-reticular temperature.