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Phytase Supplementation under Commercially Intensive Rearing Conditions: Impacts on Nile Tilapia Growth Performance
Edgar Junio Damasceno Rodrigues1, Paulo Incane Ito1, Lucas Franco Miranda Ribeiro1
1School of Veterinary Medicine and Animal Science, Department of Breeding and Animal Nutrition, UNESP-São Paulo State University, Botucatu 18610-034, SP, Brazil.
Animals : an Open Access Journal From MDPI
|January 8, 2023
Summary
Phytase supplementation in Nile tilapia diets significantly improved growth and nutrient digestibility. Optimal levels of 1537.5 to 1593.2 UF kg⁻¹ enhance fish performance and nutrient bioavailability in commercial farming.
Area of Science:
- Aquaculture
- Animal Nutrition
- Fish Physiology
Background:
- Phosphorus is an essential nutrient for fish growth, but its bioavailability from plant-based ingredients is limited.
- Phytase enzymes can release phytate-bound phosphorus, improving nutrient utilization in fish diets.
- Optimizing phytase levels is crucial for enhancing the nutritional value of plant-based diets for Nile tilapia.
Purpose of the Study:
- To evaluate the impact of varying phytase supplementation levels on the growth performance of Nile tilapia (Oreochromis niloticus).
- To assess the effects of phytase on the apparent digestibility of nutrients in plant-based diets for Nile tilapia.
- To determine the optimal dietary phytase inclusion rate for Nile tilapia in a commercial aquaculture setting.
Main Methods:
- Nile tilapia were fed five plant-based diets with graded phytase levels (0-2000 UF kg⁻¹) and a positive control diet for 97 days.
- Growth performance parameters including weight gain and feed conversion ratio were measured.
- Apparent digestibility coefficients for dry matter, crude protein, energy, and ash were determined.
Main Results:
- Quadratic regression analysis identified optimal phytase levels of 1537.5 UF kg⁻¹ for daily weight gain and 1593.2 UF kg⁻¹ for feed conversion rate.
- Supplementation with 2000 UF kg⁻¹ phytase significantly increased the apparent digestibility of dry matter, crude protein, energy, and ash.
- Phytase inclusion improved overall nutrient bioavailability in Nile tilapia diets.
Conclusions:
- Phytase supplementation effectively enhances growth performance and nutrient digestibility in Nile tilapia fed plant-based diets.
- Dietary inclusion of 1500-2000 UF kg⁻¹ phytase is recommended for optimizing Nile tilapia production in commercial farms.
- Phytase application improves nutrient utilization, potentially reducing phosphorus excretion and environmental impact.
