Item	Weaning age		Contrast
Item	14 d	28 d	14 vs. 28 d
NK cytotoxicity, % (Effector:target = 50:1)
Day 0, prior to weaning	85.0 ± 6.7^a	54.3 ± 4.4^a	**
Day 1, post-weaning	70.2 ± 3.6^a	52.2 ± 3.7^a
Day 7, post-weaning	58.7 ± 3.8^b	19.6 ± 2.9^b
Day 14, post-weaning	38.9 ± 2.9^c	34.5 ± 2.8^c
Neutrophil phagocytosis, %
Day 0, prior to weaning	33.2 ± 1.7^a	26.7 ± 1.7^a	**
Day 1, post-weaning	44.3 ± 1.7^b	20.1 ± 2.7^a
Day 7, post-weaning	32.9 ± 1.7^a	25.1 ± 1.7^a
Day 14, post-weaning	24.7 ± 1.8^c	32.4 ± 1.7^b
Neutrophil chemotaxis, no. (directed migration)
Day 0, prior to weaning	119.8 ± 18.0^a	96.7 ± 19.2^a
Day 1, post-weaning	112.6 ± 18.1^a	128.1 ± 18.1^b
Day 7, post-weaning	193.8 ± 18.1^b	79.6 ± 18.1^a
Day 14, post-weaning	115.5 ± 18.1^a	98.2 ± 19.1^a
Plasma IgG, ng/ml (10³)
Day 0, prior to weaning	4.94 ± 1.8^a	4.88 ± 1.8^a
Day 1, post-weaning	4.25 ± 1.9^a	4.44 ± 1.8^a
Day 7, post-weaning	3.29 ± 1.9^b	4.05 ± 1.8^a
Day 14, post-weaning	2.68 ± 1.9^c	6.02 ± 1.9^b	**
Cortisol, ng/ml
Day 0, prior to weaning	21.8 ± 2.5	32.9 ± 2.5^a	**
Day 1, post-weaning	25.7 ± 2.5	35.9 ± 2.5^ac	*
Day 7, post-weaning	19.1 ± 2.6	21.3 ± 2.5^b
Day 14, post-weaning	22.1 ± 2.5	40.0 ± 2.6^c	**