Sources and levels of oils in the feeding of common carp (Cyprinus carpio L.) in the phase of growth

In this research four lipids sources (cotton, canola, sunflower, corn) and three inclusion levels (1, 3 and 5%) were tested in common carp feeding (Cyprinus carpio L.) incorporated to the diet in the fattening stage. The fishes had start medium weight of 26,6 +/- 2,02g and start medium length of 11,2 +/- 0,09cm. Diets were formulated inside the criteria to the species and to the production system with ingredients in wich gross protein and energy were kept stable in 28% and 2800kcal of metabolizable energy/kg of ration. Diets were offered in the quantity of 1% of living weight per day readjusted every 30 days in the peletized form. Each experimental parcel comprised six fishes and used an entirely ramdomized design, in factorial (4 sources, 3 levels and 3 repetitions). The data were submitted to variance analisys F test to significant level of 5%, and the mediums compared by the Tukey test. The variables final medium weight, final medium length, feed conversion ratio and survival, showed no significant differences between the tested treatments (P>0,05). Based on the collected data, all sources and lipids levels used are efficient in the feeding. Thus, the one with lower economical value should preferably be used.