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Diet Formulation Strategies and Determination of Optimal Ratios of Standardized Ileal Digestible Amino Acids in Broiler Chickens (Gallus gallus domesticus L.) from one to 14 Days of Age
Dissertation Abstract:
Three studies were conducted. Study 1 evaluated the effect of diet formulation strategies on broiler production performance, caloric efficiency, carcass characteristics, and diet economics. Study 2 determined the optimal SID Lys to ME ratio in Cobb 500 broiler chicks from one to 14 days of age fed corn or cassava meal-based diets on growth performance, efficiency of Lys utilization, caloric efficiency, excreta quality, carcass characteristics, and diet economics. Study 3 determined the optimal ratio of SID TSAA to Lys in Cobb 500 broiler chicks fed corn or cassava meal-based diets for one to 14 days of age on growth performance, efficiency of Lys utilization, caloric efficiency, excreta quality, carcass characteristics, and diet economics.
In Study 1, 400-day-old, straight-run Cobb 500 broiler chicks were randomly allotted to one of four treatments following a randomized complete block design. There were 10 replicate cages per treatment with 10 birds in each cage. A total of four corn-cassava meal-soybean meal diets were formulated using ingredient values for AME and digestible amino acids from (1) PHILSAN (2008) reference standards, (2) Brazil reference standards (Rostagno et al. 2011),* (3) INRA reference standards (Sauvant et al. 2004),† and (4) near infrared reflectance spectroscopy (NIRS) predicted values (Precise Nutrition Evaluation Adisseo NIRS Service, Singapore). Results showed that broilers fed with diets formulated using the Brazil feed ingredient database had the best (p < .05) overall FIG and greatest (p < .05) economic return among the treatments. The present experiments also indicated that the optimal ratio for SID Lys to ME and SID TSAA to Lys in Cobb 500 chicks from one to 14 days of age, raised under tropical environments was 4.45 and 0.80 g/Mcal, respectively. In conclusion, production and economic efficiencies of broiler production may be optimized by accurately assessing the nutrient supply and their nutrient requirements under the specific conditions wherein birds were raised.