EFFECT OF DIETARY SUPPLEMENTATION OF SYNBIOTICS "POWER LAC ® " ON GROWTH PERFORMANCE, PHENOTYPIC TRAITS AND DIGESTIVE ENZYME ACTIVITIES OF MONOSEX NILE TILAPIA, Oreochromis niloticus
Category:- Journal; Year:- 2022
Discipline:- Fisheries & Marine Resource Technology Discipline
School:- Life Science School
Abstract
Synbiotics are a
combination of probiotics and prebiotics which are used as functional feed additives
in animal diets. The effects of different synbiotics depending on the
microorganisms which is used as probiotics and the substrate which is used as
prebiotics. In the commercial feed additive secor there are several
manufactured synbiotics with different efficacy. Therefore, the present study
aimed to investigate the effects of commercial synbiotics containing
Lactococcus lactis >1×1011 CFU/Kg and starch on growth performance,
phenotypic traits and digestive enzyme activities of monosex Nile tilapia,
Oreochromis niloticus. A total of 360 appearent healthy monosex tilapia (1.15 ±
0.19 g) were divided into four treatments (three replicates each). The fish
were fed a commercial diet supplemented with different levels of synbiotics (0,
1, 2, and 3 g/kg diet) for 45 days. The results revealed that final weight,
weight gain, and specific growth rate improved significantly (p ≤ 0.05) in all
synbiotics supplemented groups. The dose response study revealed that the
polynomial regression is the fit regression model with R2 equal 0.89 and 0.85
with final weight, and specific growth rate, respectively. The dressing percent
increased significantly (p ≤ 0.05) with 2 g synbiotic /kg diet compared to
other groups. The morphometric evaluation revealed significant improvement in
total, standard, and trunk length, and body area in synbiotic supplemented
groups. The activities of amylase and protease enzymes in the intestine
increased significantly with increasing synbiotics supplementation. It is
recommended to use POWER LAC® synbiotics at levels of 2 g/kg diet to improve
growth performance, phenotepic traits and digestive enzyme activities.