determination of metabolizable eenergy, protein quality and chemical composition of blood meal for broiler chickens and adult leghorn rosters

three experiments were conducted to study metabolizable energy, protein quality and chemical composition of four blood meal (bm) samples from local animal rendering plant during 20 days sampling. all experiments were designed in a completely randomized design. the result of first experiment showed that chemical composition averages of bm samples were: dm, 88.43; cp, 77.03; ee, 1.12; ash, 5.01; ca, 0.46; p, 0.37 percent. cp and dm percentage of bm samples were significantly different from nrc, 1994. mean gross energy of the samples was 4193 kcal/kg. protein efficiency ratio (per) and net protein ratio (npr) were assessed using an experiment including 6 treatments, 4 replicates and 7 ross male broiler chickens in each replicate. per and npr varied between 1.21 to 1.38, and 2.18 to 2.41 among bm samples, respectively. per and npr values were significantly lower than that of corresponding values in fish meal. in second experiment, the bm samples were substituted at 5 and 10 percent of corn-based diet and nitrogen corrected apparent metabolizable energy (amen) was evaluated in adult roosters with total excreta collection assay. amen values did not show significant difference among bm samples at tow substitution levels, 5 and 10 % of corn based diet. amen values varied from 2504 to 2573 kcal/kg. in third experiment, nitrogen corrected true metabolizable energy (tmen) was determined by sibbald’s precision-fed assay. this experiment included 5 treatments and 6 replicates in each replicate. means of tmen was 2895 kcal/kg in the bm samples that there was not significant difference among bm samples.