Partial replacement of fishmeal by meat silage in extruded diets for Clarias gariepinus
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Instituto de Ciencia Animal
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In order to evaluate the partial replacement of fish meal by chemical silage of pig by-products in extruded diets to feeding fish, a total of 360 small fish of Clarias gariepinus (10.15 ± 0.01 g initial weight and 11.8 ± 0.01 cm) were used, randomly placed in three treatments with three repetitions, according to one-way model. The treatments were a control diet, with 35 % of fish meal and two experimental, with levels of 10 and 20 % (dry basis) of chemical silage with pig by-products, representing substitution of 28.75 % and 57.14 % of fish meal , respectively. The survival was high in all treatments (100 to 96%). The food and protein supplied per fish were reduced (P <0.05) in 8.64 g and 3.09 g respectively, for 20% of pig by-products with respect to the control. There were significant differences (P <0.001) in growth. In the treatments with 10 and 20 % of chemical silage of pig by-products, the final weights were 7.4 g and 28.33 g lower than in the control, and the length was only statistically reduced 3.26 cm for 20% of chemical silage of pig by-products. The conversion factor was affected at 530 g more of food/kg of live weight, when including 20% of by-product chemical silage, as well as protein efficiency, which decreased with that treatment. The condition factors K were similar for the three evaluated diets. It is concluded that silage can be acceptable up to 10% (dry basis) in extruded diets for Clarias gariepinus and higher levels markedly reduce productive indicators.
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