The purpose of this study was to examine the effects of L-carnitine addition to the different diets of broilers, on performance and organ weights. In a 3x2 factorial arrangement 312 male Avian Farms broilers were fed either including 50 mg/kg L-carnitine or not, besides 3 different diets (which include optimum energy with optimum protein, 5% less energy with optimum protein and optimum energy with 10 % less protein) each with 4 replicates including 13 chicken.
Experimental results indicated that L-carnitine did not effect broiler performance and organ weights except percentage of liver to body weight and 3-6 weeks feed conversion rate. Feed conversion rate was improved at 3-6 weeks (p<0.05) and percentage of liver to body weight (p<0.01) was decreased by the addition of L-carnitine. Rations had significant effects on final body weight, avarage body weight gain, feed conversion rate, percentage of liver and abdominal fat to body weight. Broilers' performances were significantly higher in the groups fed with optimum energy and protein ration, including L-carnitine. Moreover, it could be considered thai this application could provide benefits to producers.