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An experiment was designed to investigate the effects of soybean, sunfloweroil and dietary L-carnitine supplementation on growth performance, someblood biochemical parameters and antibody titer against Newcastle disease ofbroiler chicks. A 5-week feeding trial, 240 1-day old male broiler chicks(Ross 308) were randomly allocated to six dietary treatments as a 3 ×2 factorial experimental design where three sources of dietary oil containedsoybean, sunflower and soybean plus sunflower oil with and without 120 mg kg−1of L-carnitine supplementation in the diet. Results showedthat soybean oil with L-carnitine significantly improved body weight gainand feed conversion ratio of broiler chicks in the grower and total periodof rearing (p < 0.05). L-carnitine supplementation significantlyincreased total protein, globulin, cholesterol, HDL and LDL (high- and low-density lipoprotein) of blood serumin broiler chicks (p < 0.05). L-carnitine supplementation increasedantibody titer against Newcastle disease of chicks and the highest levels were observed in those with the supplement of L-carnitine in the soybean oil dietarytreatment. Results of this experiment showed that the growth performance andblood biochemical responses of broiler chicks to dietary supplementation withL-carnitine in dietary oil source and soybean oil, in comparison tosunflower oil, is the better plant oil for growth and immunological performance ofbroiler chicks

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Effects of dietary soybean and sunflower oils with and without L-carnitine supplementation on growth performance and blood biochemical parameters of broiler chicks