Table 5.

Urine and milk nitrogen (N) excretion in dairy cows fed 3 experimental diets

Items	Treatmentc			SEM	P-value
	AH	L-NFC	H-NFC
N intake, g/d	504a	497a	451b	1.29	< 0.01
Urinary N excretion, g/d	230a	235a	191b	10.7	0.03
N excretions, % of N intake
Urinary N	46.2	48.0	42.6	1.79	0.11
Milk N	27.5	26.0	28.0	1.14	0.20

^a-bLeast squares means within a row with different superscripts differ significantly (P < 0.05)

^cAH = Total mixed rations containing alfalfa hay; L-NFC = Total mixed rations containing corn stover with a low content of non-fiber carbohydrates; H-NFC = Total mixed rations containing corn stover formulated to have similar non-fiber carbohydrate concentrations as the AH diet