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Chemical composition and apparent digestibility of feed found in the Brazilian semiarid region for tilapia rosa feeding on cultivation/Composicao bromatologica e digestibilidade aparente de alimentos encontrados na regiao semiarida brasileira para arracoamento de tilapia rosa em cultivos
This study evaluated the apparent digestibility coefficient of dry matter, crude protein and digestible energy (Kcal [kg.sup.-1]) for six ingredients (cassava chips, sorghum grain, atriplex hay, gliricidia hay, leucaena hay and wine residues) available in Brazilian semi-arid for pink tilapia feed. T...
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Published in: | Ciência rural 2011-02, Vol.41 (2), p.343 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | Spanish |
Subjects: | |
Online Access: | Get full text |
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Summary: | This study evaluated the apparent digestibility coefficient of dry matter, crude protein and digestible energy (Kcal [kg.sup.-1]) for six ingredients (cassava chips, sorghum grain, atriplex hay, gliricidia hay, leucaena hay and wine residues) available in Brazilian semi-arid for pink tilapia feed. The feed were stained with 0.1% of chromic oxide III. A total of six circular tanks containing 1000 liters of volume were used. In each one was placed a circular cage of plastic screen with 20 fish each (initial weight of 80g). The fish were hand fed daily 3 times a day. To collect feces each cage was placed in the evening in conical 250L fiberglass tanks. Apparent digestibility of the ingredients tested was calculated based on the content of chromic oxide III in the samples offered and in the feces by atomic absorption spectrophotometry to the nutrient feed and feces, according to standard procedure. Among ingredients evaluated the best CDA values for MS were to cassava chips and sorghum. The best CDA values for CP were to cassava chips, sorghum and gliricidia hay. Atriplex hay was the ingredient with better digestible energy value. Key words: Oreochromis sp., alternative ingredients, northeast. Neste trabalho, avaliou-se o coeficiente de digestibilidade aparente da materia seca, proteina bruta e a energia digestivel de seis alimentos (raspa de mandioca, grao de sorgo, feno de atriplex, feno de gliricidia, feno de leucena e residuo de vitivinicola) disponiveis no semiarido brasileiro, para a tilapia rosa. As racoes foram marcadas com 0,1% de oxido cromico III. Utilizaram-se seis caixas circulares contendo 1 000 litros de volume util. Em cada caixa foi colocada uma gaiola circular de tela plastica, com 20 peixes cada (peso inicial de 80g). Os peixes foram arracoados diariamente, tres vezes ao dia. Para a coleta das fezes, cada gaiola foi colocada no inicio da noite em cubas de fibra de vidro conicas com capacidade de 250L. O coeficiente de digestibilidade aparente dos ingredientes testados foi calculado com base no teor de oxido cromico III nas amostras de fornecidos e fezes, por analise de espectrofotometria de absorcao atomica. Dentre os alimentos avaliados, os melhores valores de CDA para a MS foram referentes a raspa de mandioca e ao sorgo. Os melhores valores do CDA para a PB foram referentes a raspa de mandioca, sorgo e feno de gliricidia. O alimento avaliado com melhor valor de energia digestivel foi o feno da atriplex. Palavras-chave: Oreochromis sp., ali |
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ISSN: | 0103-8478 |