T he potential value offish silage as a protein source for freshwater fish was assessed by chemical analysis and by incorporation of silage in exprimental diets for Oreochromis niloticus , Fish silage was prepared from a mixture of Nile tiiapia unedible parts,. Sulphuric formic silage was prepared by addition of 1.5% concentrated sulphuric acid and 1.5% concentrated formic acid to the minced mixture of whole Nile tiiapia bodies. The silage was stored for 24 weeks. The chemical composition of fish silage was determined and some of the changes occuring in protein during storage were described. Three diets were formulated in which fish meal was replaced by fish silages (50,75 andl00% silage), Diets were fed to experimental groups of tiiapia for 13 weeks. A significant difference in growth performance and protein productive value were noted between tiiapia fed on 100% fish silage and other treatements; however feed convertion ratio and protein efficiency ratio showed no significant differences between all treatments. The carcass composition parameters were affected by silage in diets. Cost benefit analysis showed that low profit index and high inclusive cost were obtained by the control diet.
Effect of partial replacement of soybean meal protein with dehydrated alfalfa meal (Medicago sativa L.) on growth performance and feed utilization of male Nile tilapia (Oreochromis niloticus L.) fingerlings reared in tanks.
Effect of dietary replacement of yellow corn energy with culled sweet potato (as non traditional energy source) on growth performance, nutrients utilization and carcass traits of growing Nile Tilapia (Oreochromis niloticus
he study aimed to investigate the effect of replacing soybean meal (SBM) protein by treated Jojoba seed meal (JSM) in diets of Nile tilapia (Oreochromis niloticus) on growth performance, nutrient utilization, carcass traits, body chemical composition and digestibility of nutrients of Nile tilapia, reared under semi-intensive conditions in fiber glass tanks. The experimental tanks (1m x 2m x 0.5m) each contains one m 3 water volume, were used in this study. The three tanks represented three dietary treatments, the first tank served as a control, where the experimental fish were fed on the control diet containing soybean meal (SBM) as a source of plant protein with fish meal as a source of animal protein. Fish of the second and third tanks were fed on diets containing the Jojoba seed meal (JSM) to replace 25 and 50% of SBM protein, respectively. The experimental tanks were stocked with Nile tilapia fingerlings at a density of 50 individuals in each tank. The experimental period lasted 18 weeks after start. The initial weight of the experimental fish ranged between 7.20 ± 0.09 g and 7.5 ± 0.08 g and they were allotted randomly into the experimental tanks. The experimental rations contained 30% crude protein and 4500 kcal gross energy/ kg diet and the experimental diets were formulated to be almost isonitrogenous isocaloric. The experimental diets were fed at a rate of 3% of tank fish biomass 6 days a week, in two portions, at 9:00 a.m. and 3:00 p.m. The results of this study revealed that, the highest (P<0.05) final weights, specific growth rate, protein and nutrient utilization were recorded by JSM 25% group followed by the control group and the JSM 50% groups, respectively. The same trend was observed in apparent digestibility coefficients. Therefore, these results suggest that up to 25% of soybean meal can be replaced by treaded Jojoba seed meal protein in Nile tilapia diets without any adverse effect on growth performance, feed and protein utilization, body composition and digestibility of nutrients.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.