Table 4. Plasma hormone concentrations at 3 and 12 months of age in low and high BW pigs.

	All		Males		Females
	Low BW	High BW	Low BW	High BW	Low BW	High BW
At 3 months:
Plasma leptin (ng ml−1)	1.4 ± 0.1	1.6 ± 0.1	1.4 ± 0.2	1.5 ± 0.1	1.4 ± 0.1b	1.8 ± 0.1
Plasma glucose (nmol l−1)	5.4 ± 0.2	5.4 ± 0.2	5.5 ± 0.3	5.5 ± 0.3	5.3 ± 0.3	5.3 ± 0.3
Plasma insulin (μU ml−1)	15.7 ± 3.0	15.8 ± 2.0	11.3 ± 3.2	15.4 ± 2.3	18.0 ± 4.3	16.3 ± 3.7
Plasma cortisol (ng ml−1)	37.3 ± 5.1	30.8 ± 2.6	25.8 ± 3.5	28.4 ± 2.4	44.0 ± 7.2	34.6 ± 5.4
Plasma noradrenaline (pg ml−1)	297 ± 50a	184 ± 19	270 ± 76	187 ± 20	314 ± 69	179 ± 42
Plasma adrenaline (pg ml−1)	148 ± 20	144 ± 31	132 ± 33	169 ± 48	158 ± 27	102 ± 19
At 12 months:
Plasma leptin (ng ml−1)	1.7 ± 0.1	1.8 ± 0.1	1.5 ± 0.1c	1.9 ± 0.1	1.8 ± 0.2	1.6 ± 0.2
Plasma glucose (nmol l−1)	4.2 ± 0.1a	4.8 ± 0.2	4.1 ± 0.1a	5.0 ± 0.2	4.3 ± 0.2	4.6 ± 0.2
Plasma insulin (μU ml−1)	10.5 ± 1.5a	15.6 ± 1.4	8.3 ± 1.4a	15.2 ± 1.6	12.3 ± 2.2	16.0 ± 2.6
Plasma cortisol (ng ml−1)	18.9 ± 3.0	29.6 ± 4.4	20.3 ± 5.4	36.4 ± 7.5	17.7 ± 3.7	22.8 ± 1.7
Plasma noradrenaline (pg ml−1)	79 ± 19	122 ± 25	96 ± 20	132 ± 48	65 ± 31	113 ± 23
Plasma adrenaline (pg ml−1)	111 ± 28	154 ± 32	175 ± 41	112 ± 23	59 ± 18a	196 ± 57

Values are means ± s.e.m. BW, birth weight. Low BW versus high BW within each sex (unpaired t test):

^aP < 0.05

^bP < 0.01

^cP < 0.001.

Plasma leptin, glucose, insulin and cortisol at 3 months: low BW males, n = 7; high BW males, n = 12; low BW females, n = 13; high BW females, n = 9. Plasma noradrenaline and adrenaline at 3 months: low BW males, n = 7; high BW males, n = 10; low BW females, n = 11; high BW females, n = 3. At 12 months: low BW males, n = 4; high BW males, n = 4; low BW females, n = 5; high BW females, n = 4.