The egg production tended to increase, but not significantly,in 44 to 72 weeks old hens dietary supplemented by high L carnitine doses (50 and 100 mg / kg). Moreover, a positive correlation between supplemental L-carnitine amounts in diets and the carnitine concentrations in egg albumen and yolk [60]. Additionally, these authors should show that the yolk contained 6-7 times more carnitine than the albumen. In Japanese quails, [7] supplementation with Lcarnitine (500 mg/kg diet) alone or combined with vitamin C (500 mg/kg diet) in diet did not improve growth and carcass yield. However, egg production was significantly enhanced by L carnitine.