Effect of partial replacement of dried, wet cull dates and date pits instead of yellow corn, supplemented with feed additives on growth performances of Nile tilapia (Oreochromis niloticus).

Abstract

ABSTRACT12-week feeding trials were conducted to evaluate the nutritive value of two forms of palm cull date and date pits as energy sources, supplemented with feed additives (Phytogenics), to be partially replaced (13.5%) yellow corn in feeding Nile tilapia fingerlings. Twelve experimental isonitrogenous (30.43% crude protein), isocaloric (436.43 kcal GE 100g-1) experimental diets were formulated taking into account energy sources and feed additives. Concerning energy source, four experimental diets were formulated which contain: yellow corn (YC) as control diet, dried cull date (DCD), wet cull date (WCD) and date pits (DP). As for feed additives (flavorings), three dietary sub-groups were builtup in each group to include: zero additives, 0.03 % Digestarom® (DG) and 0.03 % Marjoram leaf extract (MLE). Ten fingerlings (10.55 ± 0.30 g) were stocked/aquarium; two replicates per treatment and fed twice daily (six days) at 3% of body weight for 84 days.The results indicated that the partial replacement (13.5%) of WCD instead of YC supplemented with or without feed additives increased fish specific growth rate and feed utilization. However, replacement either DCD or DP decreased tilapia performances; meanwhile DP recorded the worst values. On the other hand, DG supplementation improved fish performances either fed WCD-based diets or control diets (YC). It could be concluded that wet cull date may be cost-effective when partially replaces yellow corn in tilapia diets as energy source, and improves fish performances when supplements with 0.03 % Digestarom®.

Incorporation of dietary palm date pits in all-male Nile tilapia (Oreochromis niloticus) diets

“…On the contrary, digestgarom addition raised fish achievements either fed on diets of fresh cull date or control diets (YC). Mabrouk et al (2011) stated that this result in accordance with the previous result of the study done by Mabrouk with the yeast additives. Carcass analysis notably presented (p>0.05) smaller raw protein level in fish given by treated date seeds than the groups given by untreated date seeds.…”

“…The carcass protein levels were alike in all treatments. Different from all the above result was mentioned by Mabrouk et al (2011) which stated that by utilizing two forms of cull date and date seeds as energy fount, added with feed additives (phytogenics), to be partially substituted (13.5%) by yellow corn (YC), isonitrogenous (30.43% crude protein), isocaloric (436.43 kcal GE/100 g)) in feeding Nile tilapia fingerlings, the specific accretion rate of fish and feed utilization can be increased. However, the substitution with either dry cull date or date seed reduced tilapia achievements; meanwhile, date seeds resulted from the worst values which are in contrary to the result of this study as seen in table 4.1 and 4.5.…”

“…These results are consistent with so many previous researches. Mabrouk et al (2011) resumed that call date may be expense-effective at the time it partially substitutes yellow corn in tilapia dietary as energy fount, and it also enhances fish achievements at the time it increases 0.03% digestion. Khadr (2006) informed that tilapia fed on the diet containing 75% wet cull date showed more economical outcomes than on control.…”

“…This is in agreement with so many works. Mabrouk et al (2011) resumed that wet cull date may be expense-effective when partially substitutes yellow corn in tilapia meals as energy fount, and enhances fish performances when they were added with 0.03% digestion. Khadr (2006) informed that tilapia fed by diet bearing 75% date seeds revealed almosteconomical outcomes in comparison with control.…”