Publicação
Efeito da suplementação enzimática de dietas à base de centeio em diferentes períodos do ciclo produtivo nas performances dos frangos de carne
| Resumo: | Plant cell walls are complex structures, whose main constituents are non-starch polysaccharides. The monogastric animal does not produce enzymes capable of degrading these structural polysaccharides and therefore, a low level of cereals may be used. The incorporation of exogenous enzymes gained increasing importance. In this study five rye-based treatments were used, where the only variable was the incorporation or not of xylanases in the diet, into specific periods of the production cycle of broilers. Body weights and food consumption were monitored, and post mortem parameters were analyzed, such as weight or length of some gastrointestinal compartments, viscosity and enzymatic activity of the digesta. The results show that performance with a rye-based diet with enzyme supplementation in the first two weeks of the trial, was not significantly diferent (p> 0.05) to performance with a rye-based diet with enzyme supplementation in the first three weeks and, during the four week trial. The results indicate that it is only necessary enzyme supplementation in the first two weeks of the production cycle of broilers, but more studies should be held in the future. |
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| Autores principais: | Santos, Carina Alexandra Infante dos |
| Assunto: | broilers rye non-starch polysaccharides xylanase digesta viscosity frangos de carne centeio polissacaridos não amilaceos xilanase viscosidade do digesta |
| Ano: | 2008 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade de Lisboa |
| Idioma: | português |
| Origem: | Repositório da Universidade de Lisboa |
| Resumo: | Plant cell walls are complex structures, whose main constituents are non-starch polysaccharides. The monogastric animal does not produce enzymes capable of degrading these structural polysaccharides and therefore, a low level of cereals may be used. The incorporation of exogenous enzymes gained increasing importance. In this study five rye-based treatments were used, where the only variable was the incorporation or not of xylanases in the diet, into specific periods of the production cycle of broilers. Body weights and food consumption were monitored, and post mortem parameters were analyzed, such as weight or length of some gastrointestinal compartments, viscosity and enzymatic activity of the digesta. The results show that performance with a rye-based diet with enzyme supplementation in the first two weeks of the trial, was not significantly diferent (p> 0.05) to performance with a rye-based diet with enzyme supplementation in the first three weeks and, during the four week trial. The results indicate that it is only necessary enzyme supplementation in the first two weeks of the production cycle of broilers, but more studies should be held in the future. |
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