Table 10.

Effect of CWB and reducing dietary CP content with supplemented essential or nonessential amino acids on nursery pig performance, experiment 2¹

	21% CP2		18% CP, No ZnO
Item	ZnO	No ZnO	1.2% Lysine3	1.35% Lysine4	1.35% Lysine + NEAA5	SEM
BW, kg
d 0	6.6	6.6	6.6	6.6	6.6	0.11
d 13	12.3a	12.0ab	11.7bc	11.6c	11.7bc	0.18
Days 0 to 13 (experimental period)
ADG, g	429a	417ab	386bc	378c	393abc	12.2
ADFI, g	598	586	601	592	565	17.2
G:F, g/kg	719a	713a	642b	640b	695a	10.1
Days 13 to 27 (common period)6
ADG, g	597	618	598	603	594	14.6
ADFI, g	891	925	906	899	904	20.0
G:F, g/kg	668	669	660	673	658	9.3

^abcMeans in the same row with different superscripts differ (P < 0.05).

¹A total of 650 pigs (Line 241 × 600, DNA, Columbus, NE, initial BW of 6.6 kg) were used in a 13-d growth study with 5 pigs per pen and 26 pens per treatment. All diets contained 4% CWB. After weaning, pigs were fed a common starter diet until day 10 or 14 postweaning for groups 1 and 2, respectively, which was considered day 0 of the trial.

²Diets were formulated to 21% CP (1.35% SID Lys) with or without pharmacological levels of ZnO (2,000 mg/kg).

³Treatment diet was formulated to 18% CP and 1.2% SID Lys by adding feed grade amino acids until the minimum Ile:Lys requirement of 52% was met.

⁴Treatment diet was formulated to 18% CP and 1.35% SID Lys with high amounts of feed grade amino acids. l-Ile and l-His were added along with other feed grade amino acids.

⁵Treatment diet was formulated to 18% CP and 1.35% SID Lys with high amounts of feed grade amino acids and with the addition of nonessential amino acids (glycine and glutamic acid).

⁶A common diet was fed only to group 2 with 14 pens per treatment.