Table 3.

Precursor contribution to the synthesis of ornithine and citrulline in fasted and fed piglets

	Precursor Contribution to the Synthesis of
		Citrulline as %RaCitrulline
	Ornithine as %RaOrnithine	From Plasma Ornithine	In Gut	Total
Fasting
Arterial
Arginine	61.6 ± 3.72	11.5 ± 0.71	−4.8 ± 0.40	6.7 ± 0.63
Glutamine	20.1 ± 3.55	3.7 ± 0.62	4.8 ± 0.80	8.5 ± 0.28
Proline	10.4 ± 1.35	2.0 ± 0.30	10.9 ± 2.0	12.9 ± 1.92
Ornithine			18.6 ± 0.56
Sum fasting	92.1 ± 5.32			28.0 ± 2.04
Fed
Arterial
Arginine	47.0 ± 6.99	12.6 ± 1.93	−5.5 ± 1.30	7.1 ± 0.67
Glutamine	16.4 ± 2.55	4.4 ± 0.70	−0.1 ± 0.79*	4.3 ± 0.62
Proline	14.8 ± 1.12	3.9 ± 0.33	8.3 ± 1.31	12.2 ± 1.10
Ornithine			26.7 ± 0.72
Enteral
Arginine	0.4 ± 0.67*	0.1 ± 0.18*	1.1 ± 0.27	1.2 ± 0.34
Glutamine	2.4 ± 0.27	0.6 ± 0.07	4.1 ± 0.87	4.7 ± 0.88
Proline	18.6 ± 2.62	5.0 ± 0.81	22.8 ± 2.87	27.8 ± 2.44
Sum fed	99.5 ± 8.00			57.3 ± 2.98

Values are means ± SE.

^*Not different from zero.