EFFECT OF DIETARY SUPPLEMENTATION WITH BIO-MOS® OR T-PROTPHYT 2000 WITH AND WITHOUT HORMONE TREATMENT ON PERFORMANCE, CHEMICAL COMPOSITION, AND HORMONE RESIDUES OF MONO-SEX NILE TILAPIA | ||||
| Journal of Animal and Poultry Production | ||||
| Article 3, Volume 3, Issue 2, February 2012, Page 99-113 PDF (425.46 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2012.82779 | ||||
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| Authors | ||||
| A. M. Abdelhamid1; Manal I. El-Barbary2; Marwa M. M. Hasan1 | ||||
| 1Animal Production Dept., Fac. Agric., Mans. Univ., Almansoura | ||||
| 2National Institute of Fisheries and Oceanography, Cairo, Egypt. | ||||
| Abstract | ||||
| Two experiments were carried out. In both experiments, Nile tilapia fry (0.1 g initial bodyweight) were stocked into glass aquaria at 100 fry / aquarium in duplicate aquaria / treatment. The experimental diets were offered daily at a feeding rate of 10 % of the fish biomass for 21 days (hormone-treated diets as commercially done for sex reverse) followed by 8 or 12 weeks as experimental periods in the 1st and the 2nd experiments, respectively. Bio-Mos® and T-Protphyt 2000 were added to the 1st and the 2nd experiments, respectively at graded levels. The results obtained revealed no significant (P≥0.05) differences among treatments in both experiments concerning growth performance and chemical composition of the fish (except final length and fat % in both experiments, ash % in the 1st experiment and dry matter % in the 2nd experiment). However, the diet containing testosterone alone in the 1st experiment(T4) and that containing T-Protphyt 2000 at 4 g / Kg diet in the 2nd experiment reflected the best growth performance. The significant (P≤0.05) values in both experiments concentrated mainly in water holding capacity (WHC, where all treatments were higher than the control) and testosterone (the control was the highest). There were positive as well as negative correlations between the physico-chemical characteristics of the fish carcasses. In conclusion, we could recommend the use of 17 α-methyl testosterone at 60 mg / Kg diet for sex reverse during the early stage after the hatch and to increase the growth and survival besides decreasing fat content without any danger from the hormone residues. The dietary inclusion of Bio-Mos® was not beneficial, whereas the dietary inclusion of T-Protphyt 2000 at 4 g / Kg diet was positively effective in increasing the growth performance of the tilapia fry. | ||||
| Keywords | ||||
| Mono-sex Nile tilapia; Prebiotic; Testosterone; Growth | ||||
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