APPARENT PROTEIN DIGESTIBILITY AND AMINO ACID AVAILABILITIES OF DIETARY FISH MEAL, SOYBEAN MEAL AND FULL FAT SOYBEAN IN THE NILE TILAPIA OREOCHROMIS NILOTICUS FINGERLINGS.

Goda, Ashraf

doi:10.21608/ejabf.2002.1734

APPARENT PROTEIN DIGESTIBILITY AND AMINO ACID AVAILABILITIES OF DIETARY FISH MEAL, SOYBEAN MEAL AND FULL FAT SOYBEAN IN THE NILE TILAPIA OREOCHROMIS NILOTICUS FINGERLINGS.

Document Type : Original Article

Author

Ashraf Goda

National Institute of Oceanography and Fisheries, Cairo.

10.21608/ejabf.2002.1734

Abstract

This study was conducted to evaluate the apparent protein digestibility and amino acid availabilities of fish meal replaced with soybean meal and full fat soybean at two levels of 50% and 75% in the.Nile tiiapia fingerlings.The carcass protein, lipid and gross energy gain were improved when dietary fish meal was replaced with soybean meal or full fat soybean at the levels of 50% than 75% .Diets containing either soybean meal (50%) or full fat soybean (50%) had the highest significant (P&0.01) value for protein digestibility coefficient than the other treatments.The over all pattern of apparent amino acids, availability corresponds to that of protein digestibility -The availability of threonine from fish meal and that of methionine of soybean meal at 75% replacement level offish meal were the lowest in the respective protein sources. Cystine availabilities of fish meal and full fat soybean at 75% replacement level were low compared with other amino acids.This study demonstrates that soybean meal or full fat soybean may used as a best source of protein in combination with fish meal in the diet for Nile tiiapia at the level up to 50% of total dietary protein, in order to ensure a favorable essential amino acid profile which closely meets the requirements.

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