Journal of Animal Research

The effect of three levels of probiotic bacterial culture (Lactobacillus bulgaricus + Lactococcus lactis lactis) was studied in 240, day-old Ven Cobb broiler chicks. Chicks were randomly allocated to three groups (4 replicates per group; 10 chicks per replicate) following randomized block design. The starter (0–14 day) diets contained 23% CP and 2978 kcal ME/kg feed. Grower's (14–28 day) diet contained 22.5% CP and 3141 kcal ME/kg while fnisher's (28–42 day) diet contained 20.10% CP and 3241 kcal ME/kg feed. Treatment T1 was control (basal diet without probiotic and E-Care-Se) and T₂ and T₃ Treatment were supplemented with probiotic bacterial culture: Lactobacillus bulgaricus + Lactococcus lactis lactis @ 2.7 × 10⁵ + 2.7 × 10⁵ and 5.4 × 10⁵ + 5.4 × 10⁵ CFU/g feed, respectively. Signifcant (p<0.05) reduction in DM intake and FCR in T₃ was observed. In spite of lower intake of DMI and FCR from T₂ to T₃ showed signifcant (p<0.05)) increase in body weight gain, calcium and phosphorus balances and effciency of utilization of protein and energy for gained biomass in broilers. The non-signifcantly higher increased in weight of different cuts of carcass were measured in broilers of T₃. With regards to the hemato-biochemical profle there was signifcant (p<0.05) increased in the number of lymphocytes and HDL and signifcantly (p<0.05) decreases in the total serum cholesterol in the broilers of T₃ decreased. The higher performances and immunological responses (p<0.05) were noticed the in broilers treatment T3 supplemented with 5.4×10⁵CFU/g+5.4x10⁵CFU/g bacterial culture of Lactobacillus bulgaricus + lactococcus lactis lactis.