Resumen

CRUZ-VELASQUEZ, Yorcelis; KIJORA, Claudia; VASQUEZ-TORRES, Walter  y  SCHULZ, Carsten. Digestibility coefficients of sun dried and fermented aquatic macrophytes for Cachama blanca, Piaractus brachypomus (Cuvier, 1818). Orinoquia [online]. 2014, vol.18, suppl.1, pp.220-228. ISSN 0121-3709.

The apparent digestibility coefficients of dry matter (ADC_drymatter), crude protein (ADC_protein) and the gross energy (ADC_energy) of the aquatic macrophytes Spirodela polyrhiza, Lemna minor and Azolla filiculoides treated by sun drying and lactic acid fermentation were determined for juveniles (31.0 ± 5.2 g) of Cachama blanca, Piaractus brachypomus. Each test ingredient was included at 300 g kg-1 in a semipurified reference diet containing chromium oxide as an indicator. Faeces were collected by a specific sedimentation system. The ADC_drymatter, ADC_protein and ADC_energy of the reference diet were 56.8%, 97.2% and 70.1%, respectively. The 3 x 2 factorial analysis of variances indicated that the digestibility coefficients of the tested macrophytes were significantly different between plant material and treatments, but not between their combinations. ADC_protein ranged from 74.9% to 84.5% in fermented macrophytes and from 51.1% to 60.4% in sundried macrophytes, indicating that the fermentation process had increased the protein digestibility of the aquatic plants (P<0.05). Among the plants, fermented Spirodela polyrhiza showed the highest nutrient and energy digestibility. Lactic acid fermentation is a highly recommendable treatment when aquatic macrophytes should be include into diets for Cachama blanca.

Palabras clave : Cachama; protein digestiblity; energy digestibility; fermentation.

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