USING OF AQUA FRESH AS FEED ADDITIVES FOR NIL TILAPIA FINGERLINGS TO STUDY GROWTH PERFORMANCE, FEED CONVERSION AND IMMUNO RESPONCE
Mohamed k. Khames1; Metwally A. Mahmoud 2;
Nashwa Abd_Elrazek3 and Amany A. Gharib 2
Fish Nutrition Dep.1; Fish Physiology Dep.2; Fish Health and Diseases dep.3 Central Laboratory for Aquaculture Research, Agriculture Research Center, Egypt.
|
Received 10/ 1/ 2021 |
Accepted 21/ 2/ 2021 |
ABSTRACT
The experiment was conducted to evaluate the effect of AQUA FRESH on growth performance, immunity and disease resistance of Nile tilapia (Oreochromis niloticus). AQUA FRESH is a commercial feed additive was added to the experimental diets at 0.00, 0.5, 1.00, and 1.50 g/kg feed and fed to four fish groups for 12 weeks. Fish groups fed on the experimental diets showed improved growth performance, feed utilization and body composition significantly (P≥0.05) compared to fish fed on the control diet. The result of body composition showed protein and lipid content were increased significantly with increasing levels of AQUA FRESH. Blood serum immune responses of O. niloticus showed enhancement of IgM level, lysozyme activity and NBT concentration in all diets than in control diet. Antioxidant activity improved in blood serum was observed in fish fed on experimental diets. The blood serum α-amylase and lipase enzymes activity were significantly increased (P≥0.05) in fish fed on experimental diets than control group. These results revealed that using AQUA FRESH were improved the growth performance, body composition, immunoresponse, digestive enzyme activity and antioxidant activity. The best group was that obtained AQUA FRESH at 1.5 gm./kg feed under the experimental condition.
Key words:
AQUA FRESH, Feed additives, Nile tilapia, growth performance, digestive enzymes, immunoresponse, antioxidants activity.
