科研之友
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摘要
The prebiotics are classified as monosaccharides, oligosaccharides or polysaccharides and can be defined as non-digestible natural additives by enzymes that beneficially affect the host by stimulating the microbial action. The Bio-Mos (R) is a prebiotic obtained from the cell wall of yeast (Saccharomyces cerevisiae) and in its constitution are alpha-mannans, beta-glycans and glycoproteins. This study aimed to evaluate the effect of adding of prebiotic mannanoligosaccharides (Bio-Mos (R)) in the diet during the sexual reversion to larvae of Nile tilapia on zootechnical performance, sex ratio, uniformity of lots and chemical composition of carcass. One-thousand and eighty larvae with three days old and initial average weight of 10.9 +/- 1.2 mg were used. The larvae were distributed in 36 aquaria with 30 L, in a completely randomized experimental design with six replications and treatments (0.0, 0.2, 0.4, 0.6, 0.8 and 1% for inclusion of prebiotic). The ad libitum feeding was carried out six times a day with diet isonutritive, isocaloric, and 60 mg kg kg(-1) of hormone masculine 17-alpha-methyltestosterone. At the end of the reversion, the values of final average weight, length, survival, specific growth and condition factor were 620 mg, 32.62 mm, 91.85%, 13.34% day(-1) and 1.31, respectively, and did not show significantly differences (p>0.05). The effectiveness of sex reversal was 100% and there was not difference (p>0.05) in uniformity of lots and in chemical composition of fish fed with different levels of inclusion of prebiotic in the diet. The inclusion up to 1.0% Bio-Mos (R) do not harm the zootechnical performance, sex ratio, survival, uniformity of lots and chemical composition of carcass of Nile tilapia during the sexual reversion.
- 出版日期2014-8
