Table 2.

Partial correlations coefficients between fat-to-protein ratio in milk (FPR) and daily energy balance (EB, MJ of ME/day) in Holstein-Friesian dairy cows during early lactation (1–20 WIM) ¹.

WIM 2	Lactation 1			Lactation 2			Lactation 3			Lactation ≥ 4
	n	r	p-Value	n	r	p-Value	n	r	p-Value	n	r	p-Value
1–4	1554	−0.411	<0.001	1359	−0.328	<0.001	814	−0.354	<0.001	802	−0.408	<0.001
5–8	1851	−0.311	<0.001	1585	−0.271	<0.001	986	−0.387	<0.001	970	−0.335	<0.001
9–12	1869	−0.257	<0.001	1579	−0.207	<0.001	957	−0.325	<0.001	953	−0.249	<0.001
13–16	1796	−0.165	<0.001	1525	−0.168	<0.001	931	−0.217	<0.001	932	−0.245	<0.001
17–20	1637	−0.118	<0.001	1367	−0.148	<0.001	818	−0.119	<0.001	830	−0.192	<0.001

¹ Correlations were controlled for the effect of individual study within the dataset; ² weeks in milk/ stage of lactation.