كليدواژه :
Chemical composition , پودر گوشت و استخوان , كيفيت پروتيين , تغذيه , جوجه هاي گوشتي , دامپروري , Protein quality , Meat and bone meal , تركيب شيميايي
چكيده لاتين :
To study of chemical composition, mineral contents and protein quality of meat and bone meal ,six composed samples were provided randomly in one month length from a meat and bone meal producing plant. The average values of chemical composition in meat and bone meal ,based on proximate analysis,were:moisture 6.1,crude protein 38.1,ether extract 20.6 and ash 23.1 percent. Mean values of gross energy and acid detergent fiber were 5338 kcal/kg and 11.1 % respectively. Mean contents of major elements : Ca , P , Mg , K , Na and CE were equal to 5.4 , 3.4 , 0.24 , 0.58 , 2.9 and 3.36 percent respectively. Trace elements of Mn, Zn, Fe, and Cu were equal to 62.4, 67.1, 1001.4 and 135.1 mg/kg respectively, on average basis. For evaluation of protein quality a nitrogen-free diet and seven semipurified diets containing 10% crude protein from meat and bone meal and fish meal origin were fed to 160 male Arbor-acres chicks from 8-17 days. The experiment was conducted in randomized completely design with 4 replicate of 5 chicks. Protein efficiency ratio (PER) and Net protein ratio(NPR) showed significantly differences(P<0.05) among meat and bone meal samples and varied between 1.28-2.04 and 2.20-2.80 respectively. The values of PER and NPR in meat and bone meals were significantly (P<0.05) lower than the corresponding values in fish meal. Percentage of tibia ash showed significantly differences (P<0.05) among meat and bone meal samples and varied between 32.64-38.31 %. The highest values of tibia ash percent were observed in samples of meat and bone meal which contained high levels of Ca and P. The levels of uric acid in blood serum, as protein quality response, showed significantly differences (P<0.05) among meat and bone meal samples and were generally higher than that in fish meal.
