4 - University of Arizona
EFFECT OF REPLACING SOYBEAN MEAL BY SUNFLOWER MEAL IN THE DIETS FOR NILE TILAPIA, OREOCHROMIS NILOTICUS (L)
Mohamed Yahia Abou Zead1; M. A. Soltan2 and M.S.Ibrahim2
1 World fish Center, Regional Research Center for Africa and west Asia Abbassa Sharkia Egypt.
2 Fac. Agric. Moshtohor, Zagazig University Benha Egypt
ABSTRACT
Five experimental diets were formulated where soybean meal in the basal diet (D1) was replaced by sunflower meal at graded levels 25, 50, 75 or 100% (D2 to D5 respectively) and fed to Nile tilapia fry for 90 days.
The highest average body weight (16.76 g) was recorded in group 1 which was fed on basal diet followed in a descending order by those fed the diet D3 (15.25 g), D2 (14.89 g), D4 (14.73 g) and D5 (12.62 g), respectively and the differences between these means were significant indicating the possibility of partial replacement of soybean meal by sunflower meal up to 75% with adverse effect on final body weight of Nile tilapia and similar trend was also observed for body length (BL), weight gain (WG), specific growth rate (SGR).
The feed conversion ratio (FCR) at the end of the experimental period ranged from 2.44 for fish fed the basal diet (D1) to 4.05 for fish fed the diet D5 (complete replacement of soybean meal) and the same trend was also observed for protein efficiency ratio (PER) and the differences in FCR and PER for the different treatment were significant.
The complete substitution of soybean by sunflower meal showed the highest protein content of whole fish followed in a descending order by those fed the diets D1, D4, D3 and D2, and the differences were significant (P ................
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