Abstract
Tryptophan (TRP) is shown to play original roles in the physiology of pigs. Dietary TRP deficiency induces depression of the appetite leading to reduced growth performance. Brain hydroxy-indoles, including the neurotransmitter serotonin, are closely related to dietary TRP supply. Excess protein, namely large neutral amino acids (LNAA) enhanced the appetite depression, providing some support to a role for plasma TRP:LNAA in the regulation of protein intake through serotonin. Other implications of TRP, as a precursor for serotonin, in the susceptibility of pigs to stress and in their consequences on meat quality were reported. Furthermore, we concluded to a role for TRP in the insulin response to the meal and in tissue sensitivity to insulin. Implications in pig feeding practice are briefly reviewed.
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