| The presence of inositol phosphates in gastric pig digesta is affected by time after feeding a non-fermented or fermented liquid wheat-barley based diet. | |
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MedLine Citation:
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PMID: 21551342 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The objective was to quantify the retention of digesta and evaluate the degradation of phytate or inositol hexakisphosphate (InsP(6)) and lower inositol phosphates (InsP(5), InsP(4), InsP(3), and InsP(2)) in the stomach at different times after feeding pigs a fermented liquid diet with microbial phytase or a non-fermented diet with or without microbial phytase. Six barrows fitted with gastric cannulas were used. The experiment was a 3 x 3 Latin square with 3 pigs fed 3 diets during 3 wk in 2 replicates. Each experimental period lasted for 7 d, comprising 3 d of adaptation and 4 d of total collection of gastric digesta. For each pig, the digesta was collected once daily at 1, 2, 3 or 5 h after feeding the morning meal. A basal wheat-barley based diet was steam-pelleted at 90°C. The dietary treatments were: non-fermented basal diet (NF-BD), NF-BD with microbial phytase (750 phytase unit of phytase/kg as-fed; NF-BD + phytase), and NF-BD + phytase fermented for 17.5 h (F-BD + phytase). Gastric InsP(6)-P was not detected at all in pigs fed F-BD + phytase due to complete InsP(6) degradation during fermentation of the feed before feeding. Gastric InsP(6)-P decreased over time (P < 0.05) in pigs fed NF-BD and NF-BD + phytase. The decrease was 45, 54, 56, and 61 percentage points greater at 1, 2, 3, and 5 h, respectively, in pigs fed NF-BD + phytase compared with NF-BD. However, still substantial amounts of InsP(6) passed to the small intestine in pigs fed NF-BD + phytase, especially within the first hour (estimated to 17% of InsP(6)-P intake). The accumulation of lower inositol phosphates in gastric digesta was very small for all treatments and at all times due to a rapid and almost complete degradation. In conclusion, phytase addition to the non-fermented diet increased the gastric InsP(6) degradation. However, considerable amounts of intact InsP(6) still passed the small intestine because of a shortage of time for InsP(6) degradation in the stomach. Therefore, to increase the apparent digestibility of plant P in dry, wheat-barley-based diets, the development of phytases that can degrade InsP(6) effectively immediately after ingestion of the feed at an initial gastric pH from 6.5 to 5.0 is needed. Feeding F-BD + phytase compensated for the shortage of time because the InsP(6) degradation was completed during fermentation before feeding. The degradation of InsP(6) to InsP(5) is the "bottleneck" for plant P utilization in pigs, as the degradation of the lower inositol phosphates is rapid and almost complete. |
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Authors:
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K Blaabjerg; H Jørgensen; A-H Tauson; H D Poulsen |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-6 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-9 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Animal Health and Bioscience, Faculty of Agricultural Sciences, Aarhus University, DK-8830 Tjele, Denmark. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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