Midhat A. EL- Kasheif

اختيار الموقع	تسجيل دخول

Biochemical constituents and histological features for muscles of Nile tilapia, Oreochromis niloticus (L.) fed cottonseed meal diets as a soybean meal replacement.
Deyab M.S. El-saidy - جامعة المنوفية - كلية الزراعة
Seham A.Ibrahim - جامعة المنوفية - كلية الزراعة
Hanan S.Gaber - جامعة المنوفية - كلية الزراعة
Midhat A. EL- Kasheif - جامعة المنوفية - كلية الزراعة

تم النشر في : This experiment intended to assess the effect of cottonseed meal (CSM) as a partial and complete replacement of soybean meal on biochemical analysis, histological features, the carcass characteristics and meat quality traits of Nile tilapia (Oreochromis niloticus) after 22 weeks of feeding period. Fish with an average initial body weight of 46.4±1.8 g were stocked in 15 glass aquarium (90 L each), at 20 fish per aquarium. The effect of CSM was obvious at concentrations of 0, 25, 50, 75, and 100% as a soybean meal protein replacement. Diets were fed to fish twice daily at a rate of 3% of body weight during the experimental period (22 weeks). The results of this study revealed that, groups of fish fed diet containing 50% CSM had significantly the highest final weight (189 g/fish), body weight gain percent (297.2%), carcass weight (96 g fish-1), fillet weight (49.0 g fish-1) and dressing % (50.5 %) compared with fish fed control and other diets. While the lowest values of final body weight, body weight gain percent, carcass weight, fillet weight and dressing % were significantly obtained with fish fed diet containing 100% CSM. Biochemical analysis of muscles indicated that the maximum dry matter, crude protein crude lipid and ash contents were obtained with groups of fish fed on the diet containing 50% CSM. While the lowest values were obtained with groups of fish fed on the diet containing 100% CSM. Fish fed control diet and 50% CSM diet had significantly the highest values of water holding capacity (W.H.C.), 7.41 and 7.18, respectively compared with others. In which case the muscles showed histological alterations in studied fish included degeneration in muscle bundles accompanied with fat vacuole in muscle bundles. Also splitting of muscle fibers and atrophy of muscle bundles were seen with increasing CSM concentration more thane 50%. Therefore, these findings suggest that up to 50% of soybean meal protein can be replaced by cotton seed meal in Nile tilapia diets without any adverse effects on biochemical analysis, histological features, the carcass characteristics and meat quality traits of Nile tilapia.