Effect of L-carnitine on broiler chickens fed with low protein diet supplemented with crystalline amino acids was allocated . 192 female commercial broiler chicks were chosen at 10 days of age based on body weight gain and used for 21 days of this experiment. This study was conducted in factorials arrangement (3*2) in completely randomized design with 20, 18, and 16% crude protein supplemented with crystalline amino acids, 0.0 and 50 mg/kg L-carnitine. Body weight gain, feed intake and feed conversion ratio were measured at the end experiment. At 31 days of age 8 birds from each treatment were randomly taken for measure abdominal fat pad , liver, breast and thigh as weight percents of carcass weight. Fortifying a low crude protein diet with excess essential amino acids resulted in significantly(P<0.05) increase in body weight gain, feed intake and favorable decrease in feed conversion ratio. Significant(P<0.05) decrease was observed among treatments 0.0 and 50 mg/kg L-carnitine diets, for body weight gain and feed intake. But for feed conversion ratio no significant effect(P>0.05) , was observed. Abdominal fat deposition of chicks fed low protein diets supplemented with amino acids were significantly(P<0.05) higher than chicks fed control diet. Reducing dietary crude protein increased serum blood sodium and chloride . Overall, this study implicate that 50 mg/kg Lcarnitine could decrease abdominal fat content, such as dietary crude protein can be decrease until 16% and the amount of excreted nitrogen was reduced with decrease crude protein levels.
