Apparent Protein and Energy Digestibility and Amino Acid Availability of Corn and Co‐products in Extruded Diets for Nile Tilapia,Oreochromis niloticus |
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| Authors: | Luiz Vítor Oliveira Vidal Tadeu Orlandi Xavier Mariana Michelato Elias Nunes Martins Luiz Edivaldo Pezzato Wilson Massamitu Furuya |
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| Institution: | 1. Escola de Medicina Veterinária e Zootecnia, Universidade Federal da Bahia, Salvador, Bahia, Brazil;2. Programa de Pós‐gradua??o em Zootecnia, Universidade Estadual de Maringá, Maringá, Paraná, Brazil;3. Faculdade de Medicina Veterinária e Zootecnia, Universidade Estadual Paulista, Botucatu, S?o Paulo, Brazil;4. Departamento de Zootecnia, Universidade Estadual de Ponta Grossa, Ponta Grossa, Paraná, Brazil |
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| Abstract: | We assessed the nutritional value of corn in extruded diets for Nile tilapia, Oreochromis niloticus, by determining the apparent digestibility coefficients of dry matter, crude protein, and gross energy, and by measuring the apparent availability coefficients (AACs) of essential and non‐essential amino acids (AAs) in several corn‐based diets. We fed 180 juvenile Nile tilapia a reference diet containing 325.8 g/kg crude protein and 4613 kcal/kg gross energy or a test diet containing a 70:30 mixture of the reference diet and a test ingredient (whole corn, corn germ, corn germ meal, corn gluten feed, or corn gluten meal). The apparent digestibility coefficients ranged from 56.3 to 96.6% (dry matter), 89.4 to 96.8% (crude protein), and 59.0 to 95.4% (gross energy). The AACs of all AAs exceeded 80% for all diets and were >90% for corn gluten meal. All ingredients showed high levels of apparent digestibility for crude protein and high AACs of AAs. Diets based on whole corn or corn gluten meal showed higher digestibility values for dry matter and gross energy, suggesting that they are preferable choices for Nile tilapia. |
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