Table 4. Mineral compositions in the milk of Jersey and Holstein cows at 3 DIM and 30 DIM.

Item	Jersey		Holstein		SEM	p-value
	3 DIM	30 DIM	3 DIM	30 DIM		DIM	Breed	DIM × Breed
Mineral compositions (mg/kg)
Ca	1,611.82	1,168.89	1,946.67	857.68	72.92	0.001	0.942	0.093
P	1,449.82	1,023.08	1,864.25	922.60	60.65	< 0.001	0.285	0.086
K	1,012.84y	946.80	1,440.28x	1,002.56	38.67	0.134	0.031	0.095
Mg	184.00y	115.40	289.98x	92.23	11.40	< 0.001	0.138	0.024
Fe	2.01	1.45	2.63	1.83	0.16	0.072	0.298	0.790
Zn	8.59y	3.73	21.95x	2.92	1.08	0.001	0.023	0.011

^x,yDenote comparisons made between 3 DIM and 30 DIM in each breed group (p < 0.05).

DIM, days in milk; SEM, standard error of means.