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Descripción
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| Effect of dietary insoluble fibre level during the last week of fattening period on carcass and meat quality traits was investigated in rabbits slaughtered at 9 weeks of age. Eighty eight rabbits, identified at weaning (28 d) with a glass-encapsulated transponder, were randomly selected at 56 d of age from two groups of rabbits fed a moderate (33% NDF) or a high (41% NDF) insoluble fibre diet. Within treatment, half rabbits were fed an experimental diet containing a very high concentration of NDF (49%) from defatted grape seed meal and the remaining animals continued receiving the same diet than before up to 63 d of age. Without fasting, rabbits were carried to a slaughterhouse and processed following standard techniques. Rabbits fed a high fibrous diet in the last week of the fattening period (56-63 d) maintained their growth rate when NDF dietary level increased from high commercial levels (41%) up to near 50%. However, when this diet was fed to rabbits following a moderate NDF (33%) diet in the growing period, feed intake increased greatly, but not enough to maintain growth rate. Dietary treatments did not significantly influence live weight before and after transport. Full gastrointestinal weight decreased by feeding the highest fibrous diet (49% NDF) in the last week of the fattening period if a high fibre diet (41% NDF) was also fed in the growing period, but the opposite effect was observed when the growing diet had a moderate fibre content (33% NDF). Expressed as live weight percentage, full gastrointestinal weight of rabbits fed moderate fibre levels (33% NDF) for the whole fattening period was significantly lower than in rabbits fed higher fibre levels (41% NDF), and dressing percentage of the former was higher. These slaughtering traits were not influenced by increasing fibre level during the finishing period from 41 to 49% NDF. The meat ultimate pH was not significantly affected by treatments. Carcass colour of rabbits with the lowest growth rate in the fattening period considered was darker, and that of animals fed the 33% NDF diet over the whole fattening period were more red coloured, compared with rabbits fed the 41% NDF diet. In conclusion, the gastrointestinal content weight, cold carcass weight and dressing percentage of rabbits may be modified by feeding a high fibrous diet in the last week of the fattening period (56-63 d). Effects depend on the fibre and energy dietary levels in the growing diet (28-56 d). No significant relationship is observed between dietary factors and carcass quality traits of rabbits slaughtered at the same age. | |
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Internacional
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Si |
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Nombre congreso
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9th World Rabbit Congress |
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Tipo de participación
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960 |
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Lugar del congreso
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Verona (Italia) |
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Revisores
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Si |
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ISBN o ISSN
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978-88-902814-6-4 |
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DOI
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Fecha inicio congreso
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10/06/2008 |
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Fecha fin congreso
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13/06/2008 |
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Desde la página
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1461 |
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Hasta la página
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1465 |
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Título de las actas
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Proceedings of the 9th World Rabbit Congress |