Níveis de extrato seco da folha de maracujá em rações de tilápia-do-Nilo

Abstract

The objective of this research was to evaluate the inclusion of dry passion fruit extract levels on productive performance, hepatosomatic and visceral fat index and plasma cortisol of Nile tilapia. A total of 140 fish were used, distributed in 20 circular tanks, forming a completely randomized design, with 5 treatments and 4 replicates. The animals were fed an extruded commercial feed, added with dried passion fruit leaf extract, forming the following treatments: Control (without addition of the extract), 0.25, 0.50, 1.00 and 2.00% inclusion. At the end of the experiment, the fish were weighed to determine the average parameters of productive performance, as well as blood collection for plasma cortisol dosage. The fish were slaughtered and weighed the liver and visceral fat. Data were submitted to analysis of variance at 5% of probability and, when significant, were submitted to regression analysis also at 5%. The apparent feed conversion showed a linear behavior due to the increase of the levels of passion fruit extract in the rations. There was no significant difference for the other performance parameters and for the visceral fat index. There was a quadratic effect of dietary extract levels for the hepatosomatic index. The inclusion level of 2.0% for better apparent feed conversion is recommended.