Synergistic Effect of Butyric and Propionic Supplementation in Common Carp Diets on Growth and Immunological Parameters

Abstract

Abstract The experiment was conducted for the period from 1/9/2021 to 3/6/2022, at the first agricultural research and experiment station of the College of Agriculture, Al-Muthanna University, which is located north of the city of Samawah near the end of the Alatshan river, about 4 km, whose water was relied upon as a source in this study. The butyric and propionic acids were mixed in the following proportions, and were fed to the experimental fish by ten treatments, which was (P0.00%, B0.00%), the control treatment, (P0.05%B0.05%) the first treatment T1, (%P 0.05%, B 0.15%) second treatment T2, (%P 0.05 0.20 B%) the third treatment T3, (%P 0.15% B0.05%) the fourth treatment T4, ( %P 0.15 %B 0.15) the fifth transaction T5, (P 0.15%B 0.20%) was the sixth treatment T6, (%P 0.20%B 0.05) was the seventh treatment T7, (%P 0.20 %B 0.15) was the eighth treatment T8, (%P 0.20 %B 0.20) was The ninth treatment T9, and they were added to diets with a protein content of 29.14% and a total energy of 396.726 (Kcal/g), 180 common carp (Cyprinus carpio L) fish were distributed among the ten treatments, and each treatment had three replications in 30 plastic cages with diameters of 50 cm and a depth of 65 cm in a cylindrical shape, each cage has 6 fish. The results showed the superiority of T2 in all growth parameters FW, WG, DGR, RGR, SGR, MGR, FI, FCR, FCE, and PER, followed significantly by T1, then T3, then T4 in almost all growth parameters. From the foregoing, it can be said that butyric and propionic acids can be used as functional additives in common carp fish diets, as they improve metabolic growth coefficient, feed conversion efficiency, and increase food intake efficiency.