Effect of different levels of Terbutaline and L-carnitine on the growth performance, carcass traits, blood parameters and immune system of broiler chickens
2016
Fallah, R. | Nazari, P. | Mirzaei, E.
This study was conducted to evaluate the effects of different levels of Terbutaline and L-carnitine on the growth performance, carcass traits, blood parameters and immune system of broiler chickens. A total of 240 one-day old commercial Ross 308 broiler chickens were used in a completely randomized design study with four treatments :(1) control diet (no supplement), (2) basal diet supplemented with 20 mg Terbutaline per kg diet, (3) basal diet supplemented with Lcarnitine 250 mg per kg diet and (4) basal diet supplemented with 10 mg Terbutaline per kg diet +L-carnitine 100 mg per kg diet, with six replicates per treatment. Addition of Terbutaline and L-carnitine was found to increase (p<0.05) body weight of chickens at 42 d of age in comparison to chickens in the control group. Significant differences (p<0.05) in feed intake was also observed between control and Terbutaline + L-carnitine treatments. Furthermore, the addition ofTerbutaline and L-carnitine decreased (p<0.05) FCR in comparison to the control group. Broilers receiving Terbutaline and L-carnitine had higher liver, gizzard, spleen and bursa of Fabricius and lower abdominal fat relative to body weight compared to the control group. Birds which received Terbutaline and L-carnitine had the lowest total cholesterol, HDL and LDL concentrations in comparison to the control group. Birds receiving Terbutaline + L-carnitine had the highest antibody Influenza and Newcastle titres at 18 and 28 d compared to the other groups. In conclusion, these results demonstrate that Terbutaline and L-carnitine and its combination improved broilerperformance, carcass characteristics by decreasing abdominal fat and enhanced immune system of broiler chickens at 42 d of age.
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