Comparative study regarding the influence of phytobiotcs as feed additives on biochemical composition of Oreochromis Niloticus meat

Abstract

The aim of this research was to evaluate the biochemical composition of the Nile tilapia meat in conditions of five phytobiotics administrated in feed. This experiment was performed in duplicate. The experimental variants were: V1 – control variant, V2 – 1% chilli pepper (Capsicum annuum) / kg feed, V3 – 1% black pepper (Pipper nigrum) / kg feed, V4 – 1% onion (Allium cepa) / kg feed, V5 – 1% goji fruits (Lycium barbarum) / kg feed and V6 – 1% basil (Ocimum basilicum) / kg feed. For biochemical analysis from muscle tissue, the sampling was performed at the beginning and at the end of the experiment from fresh meat. The results showed a significant differences (p<0.05), between variants in which were administered phytobiotics compared with the control variant, in case of the protein content (%), moisture content (%) and dry matter (%). Also, in this paper are presented the dynamics of the nutrient retention efficiency (PER-g/g, PUE-%, RP-g/fish and RLg/ fish) in the muscle tissue of the Nile tilapia. The best results were obtained in the case of the V3 variant regarding to retained protein (RP), PER and PUE and in V5 variant regarding to retained lipid (RL). In conclusion, the use of these phytobiotics in a concentration of 1% / kg feed in the Nile tilapia diet, led to significant changes (p <0.05) in the positive sense of the percentage moisture, protein and dry matter from muscle tissue and has contributed to the increasing the nutritional value of fish.