Table 3. Pearson correlation coefficients between milk traits, cow age and weeks in milk (P value below).

	Weeks in milk	Cow age	MY	FP	PP	FY	PY
MY	−0.307	0.517
	<0.001	<0.001
FP	0.046	0.102	−0.374
	0.218	0.006	<0.001
PP	0.221	−0.149	−0.511	0.621
	<0.001	<0.001	<0.001	<0.001
FY	−0.291	0.598	0.782	0.275	−0.118
	<0.001	<0.001	<0.001	<0.001	0.002
PY	−0.256	0.526	0.922	−0.153	−0.146	0.853
	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001
MSY	−0.287	0.589	0.873	0.099	−0.135	0.974	0.950
	<0.001	<0.001	<0.001	0.008	<0.001	<0.001	<0.001

MY–milk yield (kg/d); FP–fat percentage (%); PP–protein percentage (%); FY–fat yield (kg/d); PY–protein yield (kg/d); MSY–milk solid yield (kg/d).