Table 1.

Composition and nutritional profile of the total-mixed ration offered for ad libitum consumption to lactating dairy cows during the experimental period

Item	Component
Composition (dry matter basis)
Corn silage, %	50.7
Ground corn, %	16.9
Soybean meal, %	11.8
Ryegrass silage, %	9.88
Wheat middlings, %	6.90
Mineral mix,a %	3.38
Urea, %	0.44
Nutritional profile (dry matter basis)
Non-detergent fiber, %	34.4
Starch, %	26.4
Net energy for lactation, Mcal/kg	1.55
Net energy for maintenance, Mcal/kg	1.70
Crude protein, %	15.1

^aContaining 23% Ca, 2.0% P, 5.5% Na, 3.5 % K, 4.0 % Mg, 7.5 % Cl, 3.1 % S, 145 mg/kg Cu, 15 mg/kg I, 4.5 mg/kg Se, 680 mg/kg Zn, 2,400 IU/g of vitamin A, 1,100 IU/g of vitamin D3, and 37 IU/g of vitamin E.