Abstract
This study aimed to evaluate increasing levels (0, 4, 8 and 12%) of acid silage viscera of surubim catfish as an alternative protein source on growth performance and apparent digestibility coefficients (ADC) for Nile tilapia. Weight gain (WG), feed intake (FI), feed conversion ratio (FCR), and protein efficiency ratio (PER) were evaluated. The digestibility for dry matter (DM), crude protein (CP), ether extract (EE), gross energy (GE) and availability of phosphorus (P) were also assessed. The experimental design was completely randomized with four treatments and four repetitions. The results indicated no difference (p > 0.05) for growth performance parameters. The ADC of CP of treatment containing 8% of silage was lower (p < 0.05) when compared to the others. On the other hand, for the GE, the same level provided a higher ADC (p < 0.05). In conclusion, acid silage viscera of surubim catfish can be included in diets for Nile tilapia up to 12%, with no negative effects on growth performance and digestibility as well as to reduce feed cost.
Highlights
Fish meal is the most used animal protein source in fish diets, due to its adequate amino acid balance, high biological values, and positive characteristics of attraction and palatability (FURUYA et al, 2001)
Animal Sciences alternative is to convert this material into silage for animal feeding, which may be economically advantageous for fish processing industry and allow the use of this waste of difficult disposal
Physical and chemical parameters analyzed were within acceptable limits for tilapia rearing (POPMA; GREEN, 1990)
Summary
Fish meal is the most used animal protein source in fish diets, due to its adequate amino acid balance, high biological values, and positive characteristics of attraction and palatability (FURUYA et al, 2001). According to Nunes (1999), the waste produced by fish processing plants generates several problems of environmental impact, when incorrectly handled, with the need to improve systems of application and management of residues. Animal Sciences alternative is to convert this material into silage for animal feeding, which may be economically advantageous for fish processing industry and allow the use of this waste of difficult disposal. Its chemical composition differs according to the type of silage (acidic, biological, and enzymatic), and proportion and type of residue
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