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Descripción
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| We studied the effects of type of fiber and level of inclusion in the diet on productive performance of broilers from 1 to 21 d of age. There were 10 experimental treatments; a control diet based on rice, soy protein concentrate, fish meal, and soy oil that contained 3,212 kcal AMEn/kg, 1.40% total Lys, and 1.61% crude fiber (CF), and 9 extra diets arranged factorially with 3 fiber sources (OH, oat hulls; SBP, sugar beet pulp, and PH, pea hulls) and 3 levels of fiber inclusion (2.5, 5, and 7.5%). The fiber source was included at expenses (wt/wt) of the basal diet. Therefore, fiber inclusion increased CF content and decreased AMEn and essential amino acid content of the basal diet. Each treatment was replicated 6 times and the experimental unit was a cage with 12 chicks. The ADG, ADFI, and feed to gain (F:G) were recorded per replicate at 7, 14, and 21 d of age. No interactions among main effects were observed. The inclusion of up to 5% of an additional fiber source improved ADG (P < 0.05) and F:G (P < 0.05) but no effects were observed for ADFI. A further increase in additional fiber to 7.5%, reduced ADG and impaired F:G (P < 0.05) with respect to 2.5 or 5% fiber inclusion but performance of birds fed 7.5% fiber was similar to that of birds fed the control diet. The beneficial effects of fiber inclusion on broiler performance were more pronounced with PH than with OH or SBP (P < 0.05) probably because of the higher starch (17.2%) and CP (11.2%) of this ingredient. We conclude that the inclusion of up to 5% fiber, to increase the CF content of the diet from 1.61% of the control diet to 2.42¿3.50%, improves performance growth of broilers. However, a further increase of fiber to 7.5% impaired ADG and F:G with respect to the 5% level of inclusion. The beneficial effect of fiber was more pronounced with PH than with OH or SBP. Thus, young broilers have a minimal requirement of dietary fiber (2.42 to 3.50% CF depending on type) for maximal growth. | |
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Internacional
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Si |
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Nombre congreso
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98th Poultry Science Association Annual Meeting |
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Tipo de participación
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960 |
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Lugar del congreso
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Raleigh, North Carolina |
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Revisores
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Si |
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ISBN o ISSN
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0032-5791 |
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DOI
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Fecha inicio congreso
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20/07/2009 |
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Fecha fin congreso
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23/07/2009 |
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Desde la página
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1 |
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Hasta la página
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232 |
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Título de las actas
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Poultry Science, 88 (1): 1-232 |