Adding of Different Levels of Butyric Fatty Acid in the Diets of Common Carp Cyprinus carpio L. and its Effect on Productive, Physiological and Immunological Characteristics

Abstract

Abstract The experiment was conducted for a period of 84 days in 12 plastic cages with a diameter of 50 cm and a depth of 65 cm in a cylindrical shape, in which 72 common carp Cyprinus carpio L. were randomly distributed, with an average weight of (25 ± 0.08) g/fish, on four experimental treatments, with three replications for each treatment and 6 fish. for each repeater. he fish were fed diets with a protein content of 29.14% and a total energy of 396.726 (Kcal/g). Butyric acid was added by spraying with a small sprinkler after mixing with 30 ml of distilled water for each kg of feed. The four addition ratios were B 0.00%, which was the control, B 0.05%, which was the first treatment, B 0.15%, which was the second treatment, and B 0.20%, It was the third treatment. The fish were fed three meals a day at a rate of 3% of body weight. The results of the statistical analysis showed that the treatment, B 0.15% was superior in all studied growth parameters, FW, WG, DGR, RGR, SGR, MGR, FI, FCR, FCE, and PER. Significantly (p≤0.05) was followed by the treatment B 0.05%, then the treatment B 0.20%. As for blood parameters, the treatment, B 0.15%, also excelled over the rest of the treatments, as it recorded an increase in RBC, Hp, PCV, MCV, MCH, and MCHC. Significantly (p≤0.05) was followed by treatment B 0.05%, then treatment B 0.20%. As for immunological criteria, B 0.15% excelled, followed by B 0.05%, as it excelled in WBC, TSP, and IGM. As for the hormonal aspects, the second treatment excelled in the standard of thyroid stimulating hormone (TSH), thyronine (T3) and thyroxin (T4), followed significantly by the first treatment and then the third treatment. In terms of liver enzymes, the results were within the normal range, although there were significant differences between the experimental treatments in the level of the studied enzymes, namely ALT, AST, and ALP. This indicates that there are no negative effects on fish with added concentrations of acid. It can be said that butyric acid can be used in diets of common carp fish due to its positive effect in many respects, especially in the growth and blood aspects.