Back to Search
Start Over
Effects of β-xylanase and 6-phytase on digestibility, trace mineral utilisation and growth in juvenile red tilapia, Oreochromis niloticus (Linnaeus, 1758) x O. mossambicus (Peters, 1852), fed declining fishmeal diets.
- Source :
-
Journal of Applied Ichthyology . Jun2016, Vol. 32 Issue 3, p471-479. 9p. - Publication Year :
- 2016
-
Abstract
- In response to the global sustainability drive to lower fishmeal ( FM) inclusion in aquatic feeds, exogenous enzymes can improve nutrient digestibility in monogastric plant-based diets. A 80-day experiment was conducted to evaluate the combined effects of xylanase and phytase on digestibility, trace mineral utilisation and growth in juvenile red tilapia, Oreochromis niloticus x O. mossambicus, (48.8 g ± 13.9; μ ± STD) fed declining FM diets. Basal diets were formulated to contain 0, 3 and 5% FM with and without xylanase (0.385 g kg−1) and phytase (0.075 g kg−1), forming six treatments. Each treatment was randomly assigned to four replicates, 20 fish tank−1; mean water temperature 28.98 ± 0.73°C. Although the size of the effects was modest, growth performances (feed intake, FCR, growth rate) decreased with lower FM levels (P < 0.05) but improved with enzyme supplementation. Enzyme supplementation increased P digestibility and trace mineral uptake (P < 0.05), but no effects were seen on protein digestibility and N retention. Nevertheless, tilapia fed the enzyme-supplemented 3% FM and control 5% FM diets performed comparably (P < 0.05). This potentially justifies a 2% FM reduction for tilapia diets using exogenous xylanase and phytase without significant effects on digestibility, trace mineral utilisation and growth. [ABSTRACT FROM AUTHOR]
- Subjects :
- *OREOCHROMIS aureus
*FISHERIES
*FISH behavior
*FRESHWATER fishes
*FISH conservation
Subjects
Details
- Language :
- English
- ISSN :
- 01758659
- Volume :
- 32
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Ichthyology
- Publication Type :
- Academic Journal
- Accession number :
- 115774781
- Full Text :
- https://doi.org/10.1111/jai.13055