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Descripción
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| Effects of diet protein (PRT), PRT source, and protease on performance, excreta pH and potential N loss from excreta during storage were studied in broilers. A 2 × 2 × 3 arrangement of treatments (TRT) were tested: 2 PRT levels (22.4% and 20.8%), 2 protease levels (0 and 2000 ppm), and 3 PRT sources (soybean meal (SBM), 15% meat meal, MM; and 20% DDGS). All diets were corn-SBM with or without partial SBM replacement by another PRT source. Each TRT was replicated 5 times (6 broiler chicks/battery cage). Diet TRT were fed from 10 to 20 d of age. At 20 d, excreta samples were taken, mixed, and subdivided in half. Alum (aluminium sulphate) was added (4% inclusion) to 1 sample per pen to determine the effect on excreta pH and N volatilization. Excreta was kept in a poultry house at ambient conditions and pH and N content monitored for 14 d post excretion. There was a PRT level and protease effect (P < 0.001) on gain and feed efficiency (FE). Broilers fed the low PRT diet gained less than the broilers fed the control diet (579 vs. 558 g gain) and those fed diets with added protease grew more (P < 0.05) and had a better FE than those fed diets with no added protease (1.37 vs. 1.42, respectively). Both diet PRT and protease inclusion had an effect (P < 0.05) on 14 d pH. Inclusion of MM reduced pH of the excreta (P < 0.001) as compared to the SBM-or DDGS (7.28 vs. 7.89 and 7.82, respectively). Alum inclusion reduced excreta pH at 7 and 14 d of storage (P < 0.001) as compared with the same excreta with no added alum (7.39 vs. 8.82 at 7 d, and 7.02 vs. 8.31 at 14 d, respectively). Neither PRT nor protease influenced potential N volatilization but PRT source and Alum inclusion had an effect (P < 0.001). Both MM and DDGS (43.2 and 39.4% N loss, respectively) decrease the potential N volatilization over 14 d of storage vs. the SBM diet (47.9% N loss). Alum addition to excreta reduced (P<0.001) potential N volatilization by a factor of 2.2. Substitution of part of the SBM with MM or DDGS and the use of Alum reduced the potential N volatilization from stored broiler excreta. | |
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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 |