Table 2.

Influence of weaning age on nursery performance¹

Item	Weaning age, d				SEM	Probability, P-value <
	19	22	25	28		Linear	Quadratic
BW, kg
Day 0 (weaning)	5.04	5.70	6.52	7.26	0.126	<0.001	0.717
Day 7	5.19	5.96	7.15	8.14	0.091	<0.001	0.191
Day 14	6.81	7.77	9.38	10.8	0.151	<0.001	0.144
Day 21	9.01	10.1	11.8	13.6	0.26	<0.001	0.198
Day 28	11.1	12.3	14.6	16.4	0.39	<0.001	0.432
Day 35	14.3	15.8	18.5	20.5	0.55	<0.001	0.611
Day 42	18.2	19.8	23.0	25.1	0.43	<0.001	0.516
Days 0 to 7
ADG, g	22	38	90	124	25.6	<0.001	0.167
ADFI, g	92	105	132	156	7.4	<0.001	0.447
G:F	239	371	687	794	41.5	0.132	0.280
Days 8 to 14
ADG, g	230	257	319	377	26.5	<0.001	0.022
ADFI, g	266	304	388	440	10.4	<0.001	0.496
G:F	865	845	822	856	20.6	0.822	0.585
Days 15 to 21
ADG, g	301	324	348	381	58.7	<0.001	0.595
ADFI, g	491	525	612	664	21.1	<0.001	0.686
G:F	613	617	569	575	9.6	0.043	0.958
Days 22 to 28
ADG, g	287	309	389	409	69.2	<0.001	0.957
ADFI, g	570	600	682	728	21.5	<0.001	0.716
G:F	502	516	569	562	12.6	0.009	0.367
Days 29 to 35
ADG, g	442	491	589	619	62.7	<0.001	0.534
ADFI, g	708	761	874	919	17.4	<0.001	0.806
G:F	624	645	673	674	10.8	0.016	0.456
Days 36 to 42
ADG, g	479	511	549	586	53.7	<0.001	0.863
ADFI, g	856	921	1,034	1,066	17.4	<0.001	0.349
G:F	560	554	530	550	3.5	0.669	0.619
Overall (days 0 to 42)
ADG, g	295	320	374	406	7.8	<0.001	0.671
ADFI, g	493	534	619	661	9.4	<0.001	0.925
G:F, g/kg	596	599	604	615	4.5	0.081	0.773
Removals, %	8.01	3.79	2.29	1.65	0.021	0.001	0.480
Mortality, %	0.71	0.36	0.96	1.04	0.012	0.463	0.634
BW CV, %
Day 0	20.1	20.2	19.2	21.4	0.42	0.049	0.004
Day 42	19.6	19.4	18.7	18.5	1.36	0.181	0.867

¹A total of 1,176 pigs weaned at 19, 22, 25 and 28 d of age were used in a 42-day period in the nursery. Pens were allotted with 50% intact males and 50% gilts, and 14 replication pens per weaning age were used across 56 pens.