From: Jugular arginine supplementation increases lactation performance and nitrogen utilization efficiency in lactating dairy cows
Items
Treatmentsc
SEM
P-value
Control
Arg group
Ala group
Urea N in serum, mmol/L
1.68a
1.36b
1.63a
0.09
0.01
Urea N in urine, g/d
155.85ab
131.05b
164.08a
11.94
0.04
Urea N in milk, g/d
9.42a
7.80b
8.95a
0.42