Digestibility coefficients of processed jackbean meal Cannavalia ensiformis (L.) DC for Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) diets
Keywords:
Digestibility, in vivo, jackbean, Oreochromis niloticus.Abstract
A study was conducted to determine in-vivo apparent digestibility coefficient of nutrients in processed
jackbean meal. Acid Insoluble Ash (AIA) was used as an indicator. The test diets consist of the seed
meal replacing soybean meal at 10, 20, 30 and 40% to serve as test diets D10, D20, D30, and D40
respectively. A diet called as diet CTR, without jackbean meal served as control. These diets were fed to
Tilapia Oreochromis niloticus fingerlings (6.37 0.07 g) in a glass tanks for 5 weeks. Faecal collection
was made by siphoning after four hours of each feeding. Proximate analysis of both diets and faecal
samples were carried out for crude protein, lipid, crude fiber, energy, and AIA. These were used to
calculate the digestibility coefficient of nutrients. There was no significant difference (p > 0.05) in lipid
and organic matter digestibility of the fish fed control diet and test diets. Significant (p < 0.05) variations
occurred in nitrogen-free extracts, protein and crude fiber digestibility of fish fed control diet and the
test diets.
