Table 2.

Arginine and citrulline transactions across the PDV and kidney of neonatal (7-day-old) and young (35-day-old) pigs

	Neonates	Young	P Value
	Arginine
PDV
Fractional uptake,%	7.7 ± 1.7	12.3 ± 3.2	<0.21
Uptake, µmol/l	11.5 ± 3.3	14.4 ± 3.6	<0.58
Release, µmol/l	15.5 ± 3.7	29.6 ± 9.0	<0.16
Net balance, µmol/l	4.0 ± 0.7	15.2 ± 5.4	<0.31
Kidney
Fractional uptake, %	6.9 ± 1.6	5.3 ± 1.9	<0.56
Uptake, µmol/l	10.2 ± 3.1	6.7 ± 2.9	<0.44
Release, µmol/l	31.3 ± 4.8	38.4 ± 5.3	<0.35
Net balance, µmol/l	21.1 ± 2.9	31.7 ± 5.4	<0.10
	Citrulline
PDV
Fractional uptake, %	0.5 ± 0.5a	1.6 ± 1.2a	<0.40
Uptake, µmol/l	1.2 ± 0.8a	1.3 ± 1.3a	<0.94
Release, µmol/l	18.9 ± 4.7	18.8 ± 5.6	<0.99
Net balance, µmol/l	17.7 ± 4.8	17.5 ± 6.8	<0.98
Kidney
Fractional uptake, %	18.9 ± 2.5	39.5 ± 3.5	<0.001
Uptake, µmol/l	35.8 ± 4.3	48.8 ± 7.1	<0.14
Release, µmol/l	0.8 ± 0.3	−0.5 ± 0.2a	<0.007
Net balance, µmol/l	−35.0 ± 4.2b	−49.3 ± 7.2	<0.11

Values are means ± SE. PDV, portal drained viscera.

^aNot different from zero.

^bNegative net balance denotes a net uptake by the organ.