Browsing by Author "Tituaña Calapiña, Luis Guillermo"
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- ItemUtilización de la hormona testosterona en reversión sexual en tilapias en el complejo la chollera en el cantón Pillaro de la provincia del Tungurahua(Universidad Estatal de Bolívar . Facultad de Ciencias Agropecuarias . Escuela de Medicina Veterinaria y Zootecnia, 2012) Tituaña Calapiña, Luis Guillermo; Carrasco, WashingtonUse of the Hormone Testosterona in the Sexual Reversion in Tilapias in the Complex the " CHOLLERA " in the Canton Pillaro in the County of the Tungurahua. The sexual reversion allows to produce a monkey-sexual seed of tilapia of high quality. The etinil-testosterona (ET) it is the hormone used for this end, but it is a sale product controlled in the country, for what their acquisition is hindered. The objectives of the work were the one of determining which of the three doses (30, 60, 90mg) he/she allows to obtain a good sexual reversion, to Limit the excessive reproduction of the tilapia in the complex, to Carry out an economic analysis in the relationship coste/beneficio in the sexual reversion of tilapia alevines. In which was evaluated the following variables: analysis fisicoquímico of the used water, I Weigh initial, increment of the weekly growth in mm, quantity of used food, percentage of effectiveness of the hormone, final weight,% of sexual reversion and the relationship costo/beneficio of the treatments. The experiment was carried out in the tourist complex the Chollera property of the family Tituaña Calapiña. The alevines (8mm of longitude) they were sowed in ponds of earth of 3m2 and 1 m from height to a density of 300 alevines for tank. They were fed daily to reason of 20% of their biomass, with a powdered food with 40% of raw protein and 30, 60, 90 mg/kg of the hormone, during 30 days. When concluding the period of sexual reversion it was evaluated the seven variables proposals to the beginning. When concluding the time of reversion accent 90 days to spend it stops then to carry out the determination of the sex of each fish for visual exam of their genital holes, You use a design totally at random (DCA) with four treatments 147 (three dose of the hormone + witness) and three repetitions. The three doses of the synthetic hormone were effective in the process of sexual reversion. In the effectiveness of the androgen with more number (295,3 alevines) of males it was found in the fish tried with 90 etinil-testosterona mg. Followed by the 60 etinil-testosterona mg with number of males of (290 alevines), in that of 30mg of opposing etinil-testosterona (273 alevines) of male fish. And there being the 213,3 male alevines in witness's groups. And in him% of sexual reversion with; 98,4 reversion% in the first place the treatment C (90mg of etinil-testosterona), the treatment B (60mg of etinil-testosterona) with 96,7 reversion%, followed by the treatment TO (30mg of etinil-testosterona) with 91 reversion% and in I finish the treatment D (witness) with 71,1 reversion%. He/she was not significant difference in the initial and final weight, neither in the increment of weekly longitude, neither in the total consumption of the food. The relationship coste/beneficio of the treatments was that him treatment D (witness) he/she has a relationship of 0,75 USD, him C (90mg ET) he/she has the relationship of 0,73 USD, followed by the treatment B (30mg ET) with 0,71 USD and in I finish the treatment D (60mg ET) with 0,70 USD of relationship