Table 3. Comparison of activity levels between non-estrus and estrus cattle based on data obtained using the bolus sensor

Item	Non-estrus	Estrus	SEM	p-value1)
Average activity2)	2.9	5.8	0.38	< 0.01
Minimum activity2)	0.0	0.0	0.00	1.00
Maximum activity2)	57.8	49.6	8.12	0.49
Activity (%)3)
0	45.8	26.7	2.63	< 0.01
1	17.6	13.9	0.83	< 0.01
2	10.0	9.2	0.84	0.36
3	6.7	6.5	0.75	0.84
4	4.5	5.7	0.62	0.05
5	3.8	4.0	0.57	0.67
6	2.4	3.4	0.43	0.02
7	1.9	3.6	0.34	< 0.01
≥ 8	10.1	25.9	2.00	< 0.01

Statistical analysis carried out using Student’s t-test.
Non-estrus animal data collected for 3 days before estrus from 10 to 12 days is an averaged value of 12 heads. Estrus data obtained for 12 hours prior to estrus confirmation and for 12 hours following is an averaged value of 16 periods of estrus of 12 heads.
Activity levels 0, 1, 2, 3, 4, 5, 6, 7, and ≥ 8 refer to the percentage of total daily activity measurements, as follows: (0≥8 number of activity measurements / total daily activity measurements) × 100.