Table 1.

Influence of weaning age on belly nosing behavior prevalence at days 8, 15, and 22 post-weaning, and percentage of pigs that lost weight in the first week in the nursery¹

Item	Weaning age, d				SEM	Probability, P-value <
	19	22	25	28		Linear	Quadratic
Belly nosing prevalence, %
Day 8	16.0	5.8	1.7	0.3	0.09	0.001	0.667
Day 15	12.2	8.2	1.1	0.5	0.11	0.001	0.157
Day 22	6.1	3.1	2.0	0.7	0.08	0.003	0.676
Overall	27.6	15.0	6.5	1.4	0.61	0.001	0.163
Pigs that lost weight in the first week, %	35.1	28.7	12.4	9.2	0.62	0.001	0.888

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