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Descripción
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| Effects of inclusion of feed additives and protease supplementation in diets differing in CP on broiler performance from 10 to 20 d of age, N retention, excreta pH and potential N loss during storage were studied. A 2 × 2 × 3 arrangement of treatments (TRT) were tested: 2 CP levels (22.4% and 20.8%), 2 protease inclusions (0 and 2000 ppm), and 3 additives (none, 1% adipic acid; and 1% CaCl2). Broilers were housed in battery pens (6 chicks/pen) and TRT replicated 5 times. On d 20, all birds were sampled and ileal content taken for apparent N retention determination. Excreta were collected by pen, mixed and divided in 2 parts. To one of the parts, 4% Alum (aluminium sulphate) was added to determine its impact on pH and potential N volatilization during storage for 14 d in a poultry house kept at ambient conditions. Low CP diets reduced gain (P<0.001) and impaired (P<0.001) feed efficiency (FE). Proteases inclusion improved gain (P<0.01) and FE (P<0.001). The inclusion of CaCl2 reduced gain (P<0.001) and impaired FE (P<0.001) with respect to the control diet or adipic acid. As compared to excreta pH from the birds fed the no additive diets, pH was reduced (P<0.001) after 7 d of storage with adipic acid and further reduced with CaCl2 but these effects disappeared by 14 d of storage. Adding Alum resulted in a decrease in excreta pH at 7 and 14 days of storage. Potential N volatilization was affected by additive (P<0.05) and Alum addition (P<0.001). The inclusion of adipic acid as well as CaCl2 reduced potential N volatilization. Samples with Alum lost 24.8% of the N in the samples after 14 d of storage while those with no Alum lost 63.3% N. We concluded that low CP diets (20.8%) and inclusion of CaCl2 impairs broiler performance. The use of 1% adipic acid or CaCl2 and 4% Alum reduced excreta pH and potential N volatilization. | |
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Internacional
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Si |
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Nombre congreso
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2009. Poultry Science Association Annual Meeting Abstracts |
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Tipo de participación
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960 |
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Lugar del congreso
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Raleigh, Carolina del Norte (EE.UU) |
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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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21/07/2009 |
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Fecha fin congreso
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21/07/2009 |
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Desde la página
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85 |
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Hasta la página
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85 |
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Título de las actas
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Poultry Science 88 (suppl.1):85. |