Table 8.

Effect of CP level with CWB in nursery pig diets on fecal dry matter, %, experiment 1¹

								P-value
	Control, 21% CP		CP (%) with CWB					CP level		ZnO
Item	Added ZnO2	No added ZnO 2	21	19.5	18	16.5	SEM	Linear	Quadratic	+ vs −	+ Control vs. 21% CP	− Control vs. 21% CP
Day of collection3
Day 7	28.8	26.8	26.5	27.7	29.3	28.9	0.88	0.029	0.349	0.108	0.059	0.776
Day 21	21.7	20.8	21.3	23.2	24.4	24.4	0.84	0.006	0.282	0.488	0.779	0.679
Day 45	24.1	27.0	26.5	24.9	24.0	23.5	0.70	0.002	0.433	0.004	0.016	0.631

¹Values represent the mean of 3 pigs per pen and 12 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.

²ZnO was included in the diet to provide 3,000 mg/kg of Zn from days 0 to 7; 2,000 mg/kg of Zn from days 7 to 21; and no additional Zn other than that from the trace mineral premix (110 mg/kg Zn) from days 21 to 45. The negative control diet contained 110 mg/kg added Zn from the premix for the entire study.

³Experimental diets were fed from days 0 to 21 and a common diet was fed from days 21 to 45.