Table 7.

Effect of CP level with CWB on growth performance of nursery pigs, experiment 1¹

								P-value
	Control, 21% CP		CP (%) with CWB					CP level		ZnO	+ Control vs. 21%	− Control vs. 21%
Item	Added ZnO2	No added ZnO2	21	19.5	18	16.5	SEM	Linear	Quadratic	+ vs. −	CP	CP
BW, kg
Day 0	5.6	5.6	5.6	5.6	5.6	5.6	0.15	0.202	0.461	0.954	0.908	0.862
Day 7	6.9	6.8	6.8	6.7	6.6	6.6	0.18	0.001	0.275	0.256	0.572	0.565
Day 21	12.2	10.8	10.9	10.9	10.3	10.3	0.56	0.003	0.957	<0.001	<0.001	0.709
Day 45	26.9	26.0	26.3	25.9	25.5	25.2	0.66	0.010	0.751	0.056	0.236	0.454
Days 0 to 7
ADG, g	177	165	171	154	135	136	7.4	<0.001	0.226	0.258	0.557	0.585
ADFI, g	171	169	168	169	155	161	8.8	0.158	0.703	0.747	0.653	0.899
G:F, g/kg	1,031	977	1,021	910	868	846	37.9	<0.001	0.141	0.206	0.816	0.300
Days 7 to 21
ADG, g	383	290	294	295	266	262	27.7	0.017	0.823	<0.001	<0.001	0.813
ADFI, g	467	382	395	399	363	377	19.3	0.102	0.705	<0.001	<0.001	0.478
G:F, g/kg	818	753	743	737	732	698	37.2	0.048	0.371	0.005	0.001	0.643
Experimental period (days 0 to 21)
ADG, g	314	248	253	247	222	220	19.3	0.002	0.830	<0.001	<0.001	0.711
ADFI, g	369	311	319	322	293	304	15.2	0.065	0.634	<0.001	<0.001	0.531
G:F, g/kg	851	795	792	767	757	724	27.0	0.002	0.785	0.007	0.005	0.887
Post-test period (days 21 to 45)3
ADG, g	611	624	640	625	632	622	9.2	0.263	0.788	0.338	0.033	0.228
ADFI, g	951	928	964	941	929	924	19.6	0.058	0.565	0.281	0.572	0.103
G:F, g/kg	643	673	664	666	680	674	9.7	0.078	0.491	<0.001	0.007	0.284
Days 0 to 45
ADG, g	473	448	457	448	440	433	11.1	0.012	0.838	0.014	0.124	0.331
ADFI, g	680	639	660	651	631	633	16.6	0.038	0.606	0.008	0.187	0.164
G:F, g/kg	696	701	693	689	697	685	4.8	0.443	0.410	0.468	0.701	0.269

¹A total of 360 pigs (Line 200 × 400, DNA, Columbus, NE initially 5.6 kg) were used in a 45-d growth study with 5 pigs per pen and 12 pens per treatment. ADG = average daily gain. ADFI = average daily feed intake. G:F = feed efficiency.

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.

³A common diet was fed from days 21 to 45.