Table 4.

Experimental growth trials involving l-Lys-Gly-based diets (only trials in which PEPT1 expression data have been reported in comparison to growth data have been listed)

Species	Developmental stage	Dipeptide	Diets used for experimental feeding	Time of experimental feeding	PEPT1 (mRNA or protein) expression	Growth	Reference
Rainbow trout (Oncorhynchus mykiss)	Juvenile (alevin)	l-Lys-Gly	Wheat-gluten-protein-based diet containing l-Lys-Gly (PP), or free l-Lys and Gly (AA), or no l-Lys (CON) vs. commercial starter Aller Futura (AF)	28 days	CON≥PP≥AA>AF (mRNA, whole intestine)	PP≥AA≥AF>CON	Ostaszewska et al. 2010ab
Common carp (Cyprinus carpio)	Juvenile	l-Lys-Gly	Wheat-gluten-protein-based diet containing l-Lys-Gly (PP), or free l-Lys and Gly (AA), or no l-Lys (CON) or frozen zooplankton (Z) (restricted diet) vs. commercial starter Anglo Norse (AN)	28 days	PP>AN=AA>Z>CON (mRNA, whole intestine)	AN>PP=AA=CON>Z	Ostaszewska et al. 2011a
Yellow perch (Perca flavescens)	Juvenile	l-Lys-Gly	Wheat-gluten-protein-based diet containing l-Lys-Gly (LG), or free l-Lys and Gly (FL), or no l-Lys (NL) vs. commercial starter Bio Oregon (BO)	55 days	LG>FL>NL (mRNA, whole digestive tract)	LG≥FL=BO>NL	Kwasek et al. 2012
Yellow perch (Perca flavescens)	Juvenile	l-Lys-Gly	Wheat-gluten-protein-based diet containing l-Lys-Gly (LG) or free l-Lys and Gly (FL) or no l-Lys (C) vs. commercial starter Bio Oregon (BO)	48 days	LG≥FL=BO>C (protein, anterior intestine)	LG≥FL=BO>C	Ostaszewska et al. 1997