Table 1.

Constituents of diets fed during far-off (−50 to −31 days relative to expected calving), close-up (−30 days to calving), and early lactation

Component	Far-off	Close-up	Early lactation
Ingredient, % of DM
Vetch hay	11.58	-	-
Alfalfa silage	-	-	9.67
Alfalfa hay	7.89	6.97	10.29
Corn silage	52.60	43.51	44.16
Wheat straw	10.52	22.25	-
Soybean meal, 48% CP	-	-	1.61
Concentrated feed	15.78	20.94	30.31
Limestone	0.82	2.25	1.57
Salt	0.30	-	0.26
Ammonium chloride	-	1.15	-
Dicalcium phosphate	0.14	0.30	0.44
Magnesium oxide	-	0.12	0.44
Magnesium sulphate	0.16	1.35	0.25
Sodium bicarbonate	-	-	0.70
Calcium sulphate	-	-	0.10
Mineral-vitamin mix1	0.21	0.17	0.20

Diet contained a minimum 4.3% of Mg, 8% of S, 6.1% of K, 2.0% of Fe, 3.0% of Zn, 3.0% of Mn, 5,000 mg/kg of Cu, 250 mg/kg of I, 40 mg/kg of Co, 150 mg/kg of Se, 2,200 kIU/kg of vitamin A, 660 kIU/ kg of vitamin D₃, and 7,700 IU/kg of vitamin E