Table 2.

Ingredient and nutrient composition of lactation diets (as-fed basis)¹

	Control		DDGS
Items	ZnSO4	PSZn	ZnSO4	PSZn	LowZn
Ingredient composition, %
Corn	75.62	75.62	52.35	52.35	75.62
DDGS	—	—	30.00	30.00	—
Soybean meal, 46.5% CP	20.89	20.89	14.33	14.33	20.89
l-Lysine HCl	0.10	0.10	0.19	0.19	0.10
Monocalcium phosphate, 21% P	1.44	1.44	0.91	0.91	1.44
Limestone	0.95	0.95	1.22	1.22	0.95
Salt	0.50	0.50	0.50	0.50	0.50
ZnSO4 premix2	0.50	—	0.50	—	—
PSZn premix3	—	0.50	—	0.50	—
Zn-free premix4	—	—	—	—	0.50
Total	100.00	100.00	100.00	100.00	100.00
Calculated nutrient composition:
ME, kcal/kg	3,297	3,297	3,308	3,308	3,297
Crude protein, %	16.08	16.08	19.41	19.41	16.08
Crude fiber, %	2.69	2.69	4.18	4.18	2.69
Crude fat, %	3.58	3.58	4.73	4.73	3.58
NDF, %	9.39	9.39	15.64	15.64	9.39
SID Lys, %	0.78	0.78	0.78	0.78	0.78
SID Trp, %	0.16	0.16	0.15	0.15	0.16
SID Thr, %	0.50	0.50	0.55	0.55	0.50
SID Met + Cys, %	0.49	0.49	0.57	0.57	0.49
Calcium, %	0.70	0.70	0.70	0.70	0.70
Phosphorus, total %	0.66	0.66	0.64	0.64	0.66
STTD phosphorus, %	0.35	0.35	0.35	0.35	0.35
Zinc added, ppm	100	100	100	100	0
Zinc total, ppm	128	128	146	145	28
Analyzed composition:
Moisture, %	12.7	12.7	11.5	11.6	12.3
Crude protein, %	15.7	14.8	19.6	19.3	14.0
Crude fat, %	1.7	1.7	2.8	2.9	1.8
Crude fiber, %	2.1	2.0	3.3	3.5	1.9
Ash, %	5.4	5.5	6.0	5.9	5.1
Zinc total, ppm5	129.9	134.2	136.0	123.7	29.3

¹Titanium dioxide used as indigestible marker added at 0.50% of the diet.

²Contained the following nutrients per kilogram of premix: vitamin A, 3,742,468 IU; vitamin D₃, 748,493 IU; vitamin E, 40,827 IU; vitamin K, 220 mg; riboflavin, 716 mg; niacin, 1,918 mg; pantothenic acid, 2,315 mg; vitamin B₁₂, 7 mg; iodine, 66 mg; selenium, 66 mg; zinc (as zinc sulfate monohydrate), 44,092 mg; iron, 35,274 mg; manganese, 11,023 mg; copper, 8,818 mg.

³Premix as above but SQM Zn (QualiTech, Chaska, MN) was the source of zinc.

⁴Premix as above but containing no supplemental zinc.

⁵Average of two dietary sample analyses.