author(s)
Indresh HC, Jayanaik, Shivakumar MC, Umashankar BC, Narayanaswamy HD and Munegowda T

abstract
The experiment was conducted at Department of Poultry Science Veterinary College, Bangalore during the month of July, 2016. The experiment was conducted to evaluate the influence of feeding graded levels of Yeast cell extracted nucleotide (YEN) at different age intervals on serum biochemical profile of commercial broilers. In a completely randomized design, 300 day-old straight run commercial broiler chicks were assigned to ten treatments with each treatments consisting of three replicates with ten chicks in each. Basal diet (control) T₁ was prepared without supplementation of yeast extracted nucleotides for day 1 to 42 days of experimental period. The birds in treatment groups T₂, T_3, T_4, T_5, T_6, T_7, T_8, T₉ and T₁₀ were fed with control diet supplemented with 1, 2 and 3 percent yeast extracted nucleotides, respectively for 14 days, 28 days and 42 days and rest of the period with control diet for remaining period upto 42 days. The highest serum protein level at the end of 14^th day recorded T₃ (3.41%), albumin level T₃ (1.63%) and globulin level T₂ (1.80%). At the end of 28^th and 42^nd day the higher level of serum protein level recorded in group T₃ (3.08%), serum albumin level in group T6 (1.35%) serum globulin level T₃ (1.77%).The results of feeding YEN on serum biochemical profile viz total protein, albumin and globulin shows that feeding graded levels of YEN upto 14 or 28 or 42 days with graded levels will not have any significant effect in the improvement of levels of serum total protein, albumin and globulin in commercial broilers.