Resumo

MANRIQUE-OROZCO, Juan D.; CALVO-CARDONA, Samir J.  e  CARDONA-BERMUDEZ, Liliana M.. Masculinization assays of rainbow trout Oncorhynchus mykiss feeding with Tribulus terrestris. Orinoquia [online]. 2018, vol.22, n.2, pp.204-214. ISSN 0121-3709.  https://doi.org/10.22579/20112629.528.

Tribulus terrestris (TT) is herbaceous plant that induces testosterone production once ingested. In order to determine the percentage of rainbow trout neomales, obtained from feeding with Tribulus terrestris; 1,200 larvae commercially acquired 100% females, was distributed in 12 concrete tanks and fed commercial balanced food (50% CP) from day 15 poseclosión for 96 days with the following treatments: 3.000 mg TT / kg feed (treatment A), 5,000 mg TT / kg feed (treatment B) control MT positive 3mg / kg feed (treatment C) and negative control with ethanol (treatment D). Productive parameters and gonadal differentiation were determined by squash technique. In water, physico-chemical parameters were measured. With each treatment A and B a percentage of males 2.67% (P <0.05) was obtained and there was the presence of intersex but without statistical significance. The daily weight gains were 0.128, 0.132, 0.109 and 0.088 g/d for treatments A, B, C and D respectively. Size gains found from 0.063 cm (D) until 0.077 cm (B); both variables had statistically significant difference (P <0.05). Survival, feed conversion factor and the incidence of costs were not significantly affected by the treatments. In conclusion, Tribulus terrestris mixed with meal doses of 3,000 mg / kg and 5,000 mg / kg does not induce masculinization of rainbow trout; however, no negative impact on the survival of it, has a significant anabolic effect, reflected in gains weight and height and is not expensive to use compared to the conventional method of hormone 17α-methyl testerone. Its use for this purpose is not recommended for inefficiency. It is the first study reported in Colombia in this regard.

Palavras-chave : hormone; sexual inversión; neomales; protodioscin.

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