Table 3. Comparative performance on activity volume1) in lactating dairy cows when changing of light intensity

Item Control T1 T2 T3 SEM p-value
Neck part 2,904.7a 2,171.3ab 1,553.3bc 1,154.4c 180.7 0.002
Thurl part 161.0b 370.8a 361.8a 118.4b 26.1 0.001
Control, natural photoperiod; T1, LDPP (day : night = 16 : 8 h) with 50 Lux of the light intensity; T2, LDPP with 100 Lux; T3, LDPP with 200 Lux.
Activity volume (unit) was counted using pedometer from 09:00 to 18:00 daily.
Denotes comparison made within rows (p < 0.05).