Table 4. Dry matter intake, body weight, milk production and milk composition in lactating dairy cows

Item	Control	T1	T2	T3	SEM	p-value
DMI (kg/d)	29.03^a	27.35^b	26.71^b	28.90^ab	0.26	0.004
Body weight (kg)	738.18	733.55	727.27	727.00	9.08	0.968
Milk yield (kg/d)	32.18^b	40.80^a	39.90^a	35.76^ab	1.03	0.003
FPCM¹⁾ (kg/d)	29.99^c	37.29^ab	39.57^a	33.75^bc	0.99	0.003
Milk fat (%)	3.86^b	3.57^c	4.35^a	3.70^bc	0.04	< 0.001
Milk protein (%)	3.21^ab	3.25^a	3.26^a	3.16^b	0.01	0.066
Lactose (%)	4.78^b	4.84^a	4.79^b	4.80^ab	0.01	0.033
MUN (mg/100 g)	14.97^c	19.13^b	20.29^a	20.21^a	0.18	< 0.001
Milk fat (kg)	1.15^b	1.30^b	1.62^a	1.26^b	0.05	0.005
Milk protein (kg)	0.99	1.18	1.21	1.08	0.04	0.143
Lactose (kg)	1.55	1.81	1.83	1.68	0.06	0.349
Total solids (kg)	3.94^b	4.57^ab	4.91^a	4.28^ab	0.16	0.137

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.
Calculated by milk yield × (0.337 + 0.116 × Fat % + 0.06 × Protein %).
Denotes comparison made within rows (p < 0.05).
DMI, dry matter intake; FPCM, fat and protein corrected milk; MUN, milk urea nitrogen.