Utilização da casca de soja e casca de arroz na alimentação de pacu

Abstract

Pacu is one of the most noteworthy native species for farming, due to its omnivorous feeding habits, rusticity in handling, enjoyable meat, and for being wanted at fish and pay places. Still, studies concerning the effects of fibers on pacu’s nourishment are incipient, considering that fibers constitute good part of the vegetable ingredients in animal food, besides accelerating gastrointestinal traffic and modifying absorption of nutrients. Thus, the present work aims to evualuate the effects of the inclusion of rice Shell and soy Shell in to the pacu juveniles’ diet. The work was conducted in the Federal University of Pampa experimental pisciculture laboratory. 216 pacu juveniles were utilized, weighting na average of 6 grams, held inside a recirculation system with a heater and biological filter. The work lasted for 60 days and had biometries twice a month. The experimental lining was entirely casualized, in a 2x3 factorial scheme, two fiber sources in three leves of inclusion, where were included 10, 13 and 16% of rice Shell and soy shell neutral detergent fiber (NDF). Data were submited to the normality test and the ANOVA was done, then submited to the Tukey 5% probability test. The growth variables analyzed were final weight, weight gain, condition factor, specific growth rate, final lenght, apparent feed conversion as well as the hepatosomatic index, digestive somatic index, intestinal quotient, carcass yeld and centesimal analysis of entire fish (dry matter, mineral matter, brute protein and ethereal extract). The growth variables showed no significant difference between the sources, but there were difference between leves, where the NDF levels of 10 and 13% obtained the best results for final weight, weight gain, specific growth rate and final lenght. The same effect was observed in carcass yeld. No difference was identified between sources and levels in hepatosomatic index, digestive somatic index and intestinal quotient. Also, no difference was observed in the centesimal composition, however, there were difference in dry and mineral matter compared to the initial control. Therefore it is possible to conclude that up to 10% of NDF may be included into pacu juveniles’ nourishment without damaging their zootechnical performance and physiology.