Table 1.

Ingredient and analyzed chemical composition of experimental diets in Exp. 1 (DM basis)

Item	Control	WDGS, % of DM
		15%			30%
		NPN, % of DM			NPN, % of DM
		0	1.5	3.0	0	1.5	3.0
Steam-flaked corn	76.47	66.50	66.49	66.48	52.57	52.57	52.56
Cottonseed meal	3.87	-	-	-	-	-	-
Urea1	1.06	-	0.52	1.06	-	0.52	1.06
Wet corn distiller’s grains with solubles	-	14.85	14.85	14.84	29.73	29.73	29.72
Supplement2–4	2.39	3.43	2.93	2.40	3.44	2.92	2.40
Corn steep liquor	4.12	4.12	4.12	4.12	4.13	4.13	4.13
Yellow grease	2.01	0.99	0.99	0.99	-	-	-
Alfalfa hay	10.09	10.11	10.10	10.11	10.13	10.12	10.12
Analyzed chemical composition
DM, %	82.73	69.95	69.98	70.02	60.80	60.83	60.86
CP, %	13.61	12.87	15.03	15.60	16.56	18.11	18.94
RDP5, %	8.59	6.78	8.28	9.83	8.91	10.40	11.96
Nonprotein N, %	3.25	0.60	1.80	3.30	0.60	1.75	3.10
ADF, %	8.00	9.95	9.95	9.45	11.75	12.45	11.25
NDF, %	13.85	15.40	18.45	17.45	20.05	22.55	20.35
Crude fat, %	4.85	5.05	4.85	4.85	4.65	4.85	4.50
Ca, %	0.99	0.88	0.87	0.86	0.93	0.89	0.80
P, %	0.33	0.36	0.37	0.35	0.42	0.43	0.41
K, %	0.78	0.81	0.84	0.82	0.90	0.90	0.87
Mg, %	0.20	0.21	0.21	0.20	0.23	0.24	0.21
S, %	0.17	0.23	0.24	0.24	0.31	0.32	0.30
Na, %	0.19	0.21	0.21	0.21	0.22	0.23	0.22
Zn, mg/kg	81	85	88	79	90	92	85
Fe, mg/kg	214	342	241	262	259	279	230
Mn, mg/kg	54	50	46	45	50	54	45
Cu, mg/kg	21	19	18	21	20	20	19

¹Urea was included in the supplement,but is presented separately for clarity. Urea was replaced with ground corn in the diet (i.e., lower supplement inclusion rate) for treatments with 0% NPN.

²Supplement for the 0% NPN diets contained (DM basis): 30.286% ground corn; 50.420% limestone; 5.714% potassium chloride; 2.542% magnesium oxide; 7.886% salt; 1% yellow grease; 0.001% cobalt carbonate; 0.112 copper sulfate; 0.002% ethylenediamine dihydroiodine; 0.148% manganese oxide; 0.429% Selenium premix (0.2% Se); 0.415% zinc sulfate; 0.197% vitamin A; 0.077% vitamin E; 0.482% Rumensin-80 (Elanco Animal Health, Indianapolis, IN); and 0.289% Tylan-40 (Elanco Animal Health).

³Supplement for the 3% NPN diets contained (DM basis): 30.286% urea; 50.420% limestone; 5.714% potassium chloride; 2.542% magnesium oxide; 7.886% salt; 1% yellow grease; 0.001% cobalt carbonate; 0.112 copper sulfate; 0.002% ethylenediamine dihydroiodine; 0.148% manganese oxide; 0.429% Selenium premix (0.2% Se); 0.415% zinc sulfate; 0.197% vitamin A; 0.077% vitamin E; 0.482% Rumensin-80 (Elanco Animal Health); and 0.289% Tylan-40 (Elanco Animal Health).

⁴Supplement for the 1.5% NPN diets contained a blend (50:50, DM basis) of supplements for 0% and 3% NPN diets.

⁵RDP values calculated using values from Table 2.