NUTRITIONAL EVALUATION OF PROCESSED SOYBEAN MEAL IN DIETS OF GENETICALLY MALE TILAPIA (GMT)

 *Sehar Munawar1, Noor Khan2, Farkhanda Manzoor1 Ghazala Jabeen1 and R.S.N Janjua3
 
 1Department of Zoology, Lahore College for Women University, Lahore 
 2Department of Fisheries and Aquaculture, University of Veterinary and Animal Sciences, Pattoki Campus
 3Country Rep. American Soybean Association
 Seharmunawar7660@yahoo.com
 

Replacement of unavailable high cost fishmeal by the identification of alternate high quality protein source can serve as the efficacious shift to the development of sustainable, economical and viable aquaculture production.

The present study was conducted to evaluate the nutritive potential of processed soybean meal (SBM) diet as a substitute to expensive fishmeal for Genetically Male Tilapia (GMT). Experimental fish (n=25) were stocked in fiberglass aquaria (Dimensions: L, 1ft 18 inch× W, 2 ft.) and was fed with experimental diets (dehulled SBM (T2) and non-dehulled SBM (T3)) at 4% of fish wet body weight. After 75 days of study period, the increase in weight gain because of consumption of T2 and T3 SBM was recorded as 626.55 and 595.76 respectively. The experimental fish fed with T2 diet showed significant higher growth than that of T3 diet fed fish group. The feed conversion ratio (FCR) was statistically highly significant for fish fed T2 with a mean value of 1.44 as compared to T3 fed fish that was 1.58.  Protein Efficiency Ratio (0.70) and (0.63) and Specific Growth Rate values (1.82) and (1.77) were found significantly different between treatments.

Proximate analysis was performed to ascertain significant differences in meat quality parameters of fish fed with T1 diet as compared to T3. A statistically highly significant difference was observed in crude protein content of the fish fed with T2 (66.90) as compare to T3 diet (65.0) followed by T1 (60.95). Fish Fed with T3 (34.10) showed significantly high values of ash content as compare to fish fed with T2 (32.95) followed by T1 (29.20). Moisture content of the fish fed with T3 (3.35) showed significantly higher values than those of the fish fed with T2 (2.65) and T1 (2.85) No significant difference in fibre and phosphorus contents were found in fishes fed with experimental diet.

At the end of the trial the fishes were slaughter and gut samples were collected for enzyme analysis. Results of enzyme analysis revealed that non-significant difference was observed for phytase and amylase activity among the treatments. Statistically high significant difference (P<0.05) for lipase activity was found in T1 (6.55) and T2 (8.55) whereas nonsignificant difference was found between T1 (6.55) and T3 (7.4).

In conclusion, the Genetically Male Tilapia (GMT) showed better growth performance with Dehulled SBM diet due to its best nutrient composition, bioavailability and acceptability. The findings of present study suggest that Dehulled SBM diet has found slightly better than the non-dehulled SBM can be used in feed of genetically male tilapia culture on commercial basis.