Nutritional Evaluation of High Ash Meat and Bone Meal for Poultry

An initial study investigated the nutritional value of a high ash m a t and bone meal (MBM) in terms of proximate amposition, true amino acid (AA) digestibility and in vitro protein digestibility as well as available energy for poultry. Chemical analyses showed consistent contents of most nutrients in high ash MBM fiom batch to batch except for a small variation in contents of fat and ash. On a DM basis, it contained GE, 425W00 kcaükg; protein, 53I2.7%; ash, 2 W % with relatively balanceci Ca (9%) and P (5%); fat 11.5% with 50% of unsaturated fatty acids. In vibu pmtein digestibility was 66% and tme digestibilities of total essential AA, Lys, ad total sulîùr AA were 83, 77.5 and 71.3@& respectively. There was no statistical differences in AA digestibility in vivo and in vitro protein digestibility beîween high and low ash MBM despite of large différence in the content of ah. Tnie metabolizable emrgy correcteci to z«o nitrogen retention waa 2800 kcakg on a DM basis. Based on the above nutrient values of high ash MBM, two experiments were conducted to evaluate the effect of various inclusion levels of high ash MBM in leghom chick diets with 100 or 90% of NRC (1994) Lys requirement on bud performance, and to study the effect on broiler chicken performance of supplementation with Lys, Met, Thr and Try individuaily or in combination in 1% high ash MBM diets. The results indicated that greater than 5% inclusion level of high ash MBM into leghom chick diets with W h NRC Lys specification yielded a linear adverse effet on chick growth in cornparison to those chicks fed the same level of high ash MBM diets, but with IW? NRC Lys requirement. Amino acid deficiency was the primary cause of growth depression. Supplcmentation of Lys and Met in 10% high a h MBM d i a signidcantly improved chick performance which reached the level of chicks fed a soybean meal control diet. Further addition of Thr and Try to the diet already containhg Lys and Met did not yield signifiant improvement on chick performance. Both Lys and Met were the first limiting AA in corn-based practical broiler diets with 10% high ash MBM. A final experiment evaluated formulation of broiler diets containhg 10 or 15% high ash MBM on a total AA versus digestible AA basis at 100 or 90% NRC AA specifiation and the effect of high dietary level of Ca and P provided by high ash MBM and inorganic source on chick performance. Results showed that no difference in performance was observed when formulating diets with 1û?4 MBM based on total vs. digestible AA values at 100% NRC specifications. Dietary formulation with high ash MBM on a total AA basis at 90% NRC significantly reduced chick performance dietary, however, for wm-soybean meal control diets, dl AA king 90% of NRC did not result in performance decline. Dietary formulation with 10 or 15% high ash MBM based on digestible AA values significantly improved chick performance when AA requirements were at 90% NRC. It brought broiler performance up to the level of corn-soybean meal wntrol diet, indicating that dietary formulation based on digestible AA values was superior to that based on total AA contents. Excessive Ca and P fiom high ash MBM were a seconday hctor responsible for the reduced chick performance, From the current study it can be concluded that the commercial high ash MBM is an effective source of protein and energy. The high ash MBM can be incorporated at a level of 10% to broiler diets.