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Balen, Rafael Ernesto; Tetu, Patrick Nereu; Bombardelli, Robie Allan; Pozza, Paulo Cesar; Meurer, Fabio
Ciência rural, 08/2014, Volume: 44, Issue: 8Journal Article
The increase in global biodiesel production is originating a glycerol surplus, which has no defined destination. An alternative to overcome this problem is its use as energy source in animal feeding. In Brazil, Pacu (Piaractus mesopotamicus) is one of the most farmed native fish species, whereas Silver catfish (Rhamdia quelen) is suitable for production in subtropical region. Considering little knowledge about crude glycerol utilization in feeds for Neotropical fish species, it was evaluated the apparent digestibility coefficients (ADCs) for energy of crude glycerol for P. mesopotamicus and R. quelen. The digestibility and digestible energy content of crude glycerol can be considered excellent even when compared to energy of common ingredients such as maize and wheat, presenting 0.97 and 0.89 of energy ADCs, and 15.2 and 13.95MJ kg.sup.-1 of digestible energy for Pacu and Silver catfish, respectively. In conclusion, crude glycerol is an energetic ingredient with good potential in Brazilian native fish diets. Key words: byproduct, glycerin, non-protein energy, nutrition. O aumento na producao mundial de biodiesel esta gerando um excesso de glicerol, sem destinacao definida. Uma alternativa para superar este problema e seu uso como fonte de energia na alimentacao animal. No Brasil, o pacu (Piaractus mesopotamicus) e uma das especies de peixes nativas mais cultivadas, enquanto que o jundia (Rhamdia quelen) e apropriado para a producao na regiao subtropical. Considerando a falta de conhecimento sobre a utilizacao do glicerol bruto em racoes para especies de peixes Neotropicais, determinaram-se os coeficientes de digestibilidade aparente (CDAs) para a energia do glicerol bruto em P mesopotamicus e R. quelen. A digestibilidade e o conteudo de energia digestivel do glicerol bruto podem ser considerados excelentes, mesmo quando comparados a energia de ingredientes comuns, como o milho e o trigo, apresentando para energia CDA de 0,97 e 0,89, e 15,2 e 13,95MJ kg.sup.-1 de energia digestivel para o pacu e o jundia, respectivamente. Por fim, o glicerol bruto e um ingrediente energetico com bom potencial para dietas de peixes nativos do Brasil. Palavras-chave: subproduto, glicerina, energia nao-proteica, nutricao.
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