Table 4.

Effect of duodenal infusion of casein or glutamic acid on nitrogen balance in steers receiving 1.5 kg of duodenally infused raw cornstarch

N, g/d	Treatment			SEM	P-value
	Control	Casein	Glutamic
Intake	60.0A	115.5B	71.9C	5.59	<0.01
Feed	57.1	52.8	57.5	5.52	0.60
Infusate	2.9A	62.8B	14.4C	0.29	<0.01
Urine	12.2A	46.1B	21.2C	1.83	<0.01
Feces	30.0	31.1	31.4	2.34	0.80
Retained, g/d	17.4A	38.0B	19.0A	2.48	<0.01

^A,B,CMeans in rows with different superscripts differ (P ≤ 0.05).