Effects of Afrostyrax lepidophyllus fruit bean powder in feed as a growth activator on the zootechnical performance of Oreochromis sp (red Tilapia) fry in concrete tanks

Abstract

This study focused on the effect of feed supplementation with Afrostyrax lepidophyllus fruit bean powder on some zootechnical performances of Oreochromis sp (red tilapia) fry in concrete tanks. 360 monosex fry of Oreochromis sp with an average weight of 1.95 ± 0.34g were divided into 12 happas, including 30 subjects per happa in triplicate in a completely randomized system for four food rations. TS (Imported Skreting feed), T0 (feed without supplement), T(0.1%F) (feed containing 0.1% A. lepidophyllus fruit bean powder), T(0.2%F) (food containing 0.2% fruit bean powder of A. lepidophyllus). These feeds were distributed 4 times a day to the fry at a regular time interval of 3 hours including 7 a.m., 10 a.m., 1 p.m. and 4 p.m. the fry were fed at 11% of their biomass for one month and then at 10% for six weeks. The analysis of variance showed no significant difference (p > 0.05) in the survival rates (97.66 ± 1.02%-98.66 ± 0.90%) but a trend on the rise in favor of feeds supplemented with the spice. Live weight (19.37 ± 0.47), average weight gain (16.96 ± 0.47), total length (7.80 ± 0.04), daily weight gain (0.22 ± 0.01g/d), the specific growth rate (9.12 ± 0.25g%/d) were significantly higher (p < 0.05) with fry fed with feed supplemented at 0.2 % fruit beans of A. lepidophyllus (T0.2%F) compared to the fry fed with the feed without supplement (T0) but significantly (p < 0.05) lower compared to the values ​​recorded with the fry fed with the feed imported feed Skreting (TS). The feed conversion ration was not significantly (p > 0.05) affected regardless of the treatment considered. Total length was significantly (p < 0.05) higher with fish fed imported feed (TS) and feed supplemented with 0.2% A. lepidophyllus fruit bean powder compared to treatments. Fed with feed without supplement (T0) and with feed supplemented with 0.1% of this spice (T0.1%F). The significantly higher feed cost of production (p < 0.05) was recorded with the treatment fed imported feed Skreting (TS) compared to the other treatments which were also comparable to each other for this parameter. The condition factor K was not significantly (p > 0.05) affected by the treatments. The supplementation of 0.2% of A. lepidophyllus bean powder in the feed can advantageously be used to improve the zootechnical performance of Oreochromis sp fry in the pre-fattening phase.