| Levels of endogenous {beta}-glucanase activity in barley affect the efficacy of exogenous enzymes used to supplement barley-based diets for poultry. | |
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MedLine Citation:
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PMID: 21597066 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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To improve the nutritive value of barley-based diet for broilers, 2 experiments using 2 different barley lots were performed to evaluate the capacity of a mesophilic cellulase when fused to a β-glucan specific family 11 carbohydrate-binding module. The data revealed that the recombinant β-glucanase derivatives were not appropriate for feed supplementation because of a lack of stability at acidic pH levels. However, under the same experimental conditions, a commercial enzyme mixture improved the nutritive value of 1 of the cereal lots used. Analysis of the nutritive value of the 2 barleys revealed intrinsic differences in the levels of endogenous β-glucanase activity. These differences were extensively evident when the studies were expanded to a range of 64 barley lots. Thus, to clarify the effect of endogenous cellulases on the efficacy of exogenous β-glucanases used to supplement barley-based diets for poultry, 2 barley lots presenting low and high levels of endogenous plant cell wall-degrading enzymes were selected. These lots were used to prepare 2 barley-based diets, which were supplemented with or without a commercial enzyme product and fed to broiler chicks. The data revealed that the exogenous enzymes were effective when the basal diet presented low levels of endogenous β-glucanases but were unable to improve the nutritive value of the barley lot displaying higher β-glucanase activity. Thus, these studies suggest that levels of endogenous β-glucanases may affect the efficacy of exogenous enzymes used to improve the nutritive value of barley-based diets for broilers. The development of a quick β-glucanase assay that could be applied for cereal-based feeds may help identify those barley-based diets that are more responsive to the action of feed enzymes. |
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Authors:
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T Ribeiro; M M S Lordelo; P I P Ponte; B Maçãs; J A M Prates; M Aguiar Fontes; L Falcão; J P B Freire; L M A Ferreira; C M G A Fontes |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Poultry science Volume: 90 ISSN: 0032-5791 ISO Abbreviation: Poult. Sci. Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-05-20 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401150 Medline TA: Poult Sci Country: United States |
Other Details:
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Languages: eng Pagination: 1245-56 Citation Subset: IM |
Affiliation:
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CIISA-Faculdade de Medicina Veterinária, Pólo Universitário do Alto da Ajuda, Avenida da Universidade Técnica, 1300-477 Lisboa, Portugal; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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