Table 11.

Effect of CWB and reducing dietary CP content with supplemented essential or nonessential amino acids in nursery pig diets on fecal dry matter, %, experiment 2¹

	21% CP2		18% CP, no ZnO
Item	ZnO	No ZnO	1.2% Lysine3	1.35% Lysine4	1.35% Lysine + NEAA5	SEM
Day of collection
Day 0	23.1	24.4	23.5	23.2	23.2	0.67
Day 66	16.7b	16.4b	18.9a	17.0ab	18.0ab	0.58
Day 13	18.0ab	17.2b	19.2a	18.1ab	18.2ab	0.51
Day 207	21.9	23.4	21.2	21.3	22.0	0.83
Day 277	20.9	23.0	21.5	22.8	20.8	0.94

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

¹Values represent the mean of 3 pigs per pen and 26 pens per treatment. Three pigs per pen were randomly selected and sampled. Fecal samples were then pooled by pen respective of day of collection and dried at 55 °C in a forced air oven.

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

³Treatment diet was formulated to 18% CP and 1.2% SID lysine 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).

⁶Group 1 samples were collected on day 7 and group 2 on collected on day 6 of each trial.

⁷Collection days consist of 3 pigs per pen and 14 pens per treatment. These collection days were only done for group 2 in the post-treatment period from days 13 to 27.