Post-hatch L-Threonine Supplementation to Low Protein Diets Influences the Growth Performance and Immune Response of CARIBRO Vishal broiler Chickens
Keywords:
Amino acids, Broilers, Globulin, Immunity, Lymphoid organs, ThreonineAbstract
Two experiments were conducted to evaluate growth performance, immune responses and carcass traits of CARIBRO Vishal broilers fed dietary L-Thr in low protein diets without or with the balance of Lys and Met. Broilers fed 85% CP diet with Thr alone showed depressed daily weight gain (linear, p=0.004), daily feed intake (quadratic, p=0.031) and higher FCR (linear, P=0.008) at d 21 (exp. 1) whereas, birds fed low CP diets but supplemented with Thr and balance of Lys and Met exhibited similar (p>0.05) growth rate as that of control diet (exp. 2). Incremental Thr levels increased (p<0.05) the immune and digestive organs weights, and enhanced antibody responses against SRBC and PHA-P antigens in both experiments. Thr inclusion increased (p<0.001) total protein and globulin in both experiments. Dietary crude protein in broiler diets could be reduced up to 85% of fast-growing broilers’ requirement with adequate supplementation of 3 limiting amino acids (Lys, Met, and Thr) for CARIBRO Vishal broiler chicks. Dietary L-Thr supplementation enhanced the immune status of broiler chickens fed low CP diets.
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