Table 2.

Milk yield and milk composition of cows in early- and mid-lactation.

Item	Early-Lactation	Mid-Lactation	SEM	p-Level
Milk yield (kg/d)	30.4	27.9	1.72	<0.01
Milk composition
Fat (%)	3.7	3.8	0.25	0.82
Protein (%)	2.9	3.3	0.14	0.09
Lactose (%)	4.9	4.6	0.06	0.01
Fat-free DM (%)	8.50	8.65	0.13	0.44
Milk urea nitrogen (mg/L)	183	132	29.01	0.25
pH-value	6.63	6.56	0.03	0.13
Somatic cell count (SCC, cells/mL)	109,600	158,900	53,351	0.53
Fat:protein ratio	1.3	1.2	0.10	0.37