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Gastrointestinal transit of extruded or pelletized diets in pacu fed distinct inclusion levels of lipid and carbohydrate
The objective of this work was to evaluate the effect of pelletized or extruded diets, with different levels of carbohydrate and lipid, on the gastrointestinal transit time (GITT) and its modulation in pacu (Piaractus mesopotamicus). One hundred and eighty pacu juveniles were fed with eight isonitro...
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Published in: | Pesquisa agropecuaria brasileira 2014-11, Vol.49 (11), p.829-835 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
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Online Access: | Get full text |
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Summary: | The objective of this work was to evaluate the effect of pelletized or extruded diets, with different levels of carbohydrate and lipid, on the gastrointestinal transit time (GITT) and its modulation in pacu (Piaractus mesopotamicus). One hundred and eighty pacu juveniles were fed with eight isonitrogenous diets containing two carbohydrate levels (40 and 50%) and two lipid levels (4 and 8%). Four diets were pelletized and four were extruded. Carbohydrate and lipid experimental levels caused no changes to the bolus transit time. However, the bolus permanence time was related to diet processing. Fish fed pelletized diets exhibited the highest gastrointestinal transit time. Regression analysis of bolus behavior for pelletized and extruded diets with 4% lipid depicted different fits. GITT regression analysis of fish fed 8% lipid was fitted to a cubic equation and displayed adjustments of food permanence, with enhanced utilization of the diets, either with extruded or pelletized diets. GITT of fish fed extruded diets with 4% lipid was adjusted to a linear equation. The GITT of pacu depends on the diet processing and is affected by dietary levels of lipid and carbohydrate.
O objetivo deste trabalho foi avaliar o efeito de dietas peletizadas ou extrusadas, com diferentes níveis de carboidrato e lipídio, sobre o tempo de trânsito gastrointestinal e sua modulação em pacu (Piaractus mesopotamicus). Cento e oitenta juvenis de pacu foram alimentados com oito dietas isoproteicas com dois níveis de carboidratos (40 e 50%) e dois níveis de lipídeos (4 e 8%). Quatro dietas foram peletizadas e quatro extrusadas. Os níveis experimentais de carboidrato e lipídeo não alteraram o tempo de passagem do bolo alimentar. Entretanto, o tempo de permanência do bolo alimentar foi dependente do processamento aplicado à dieta. Os peixes alimentados com dietas peletizadas apresentaram o maior tempo de trânsito gastrointestinal (TTGI). A análise de regressão do comportamento do bolo alimentar para dietas peletizadas e extrusadas com 4% de lipídeo mostraram diferentes ajustes. A análise de regressão do TTGI de peixes alimentados com 8% de lipídios ajustou-se a uma equação cúbica e mostrou ajustes na permanência do alimento, com maior aproveitamento das dietas, quer com dietas extrusadas ou peletizadas. O TTGI dos peixes que receberam dietas extrusadas com 4% de lipídeos ajustou-se a uma equação linear. O TTGI de pacu depende do processamento da dieta e é afetado pelos níveis de lipídios e c |
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ISSN: | 0100-204X 1678-3921 0100-204X |
DOI: | 10.1590/S0100-204X2014001100001 |