کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9916613 | 1552507 | 2005 | 17 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Inter-laboratory variation of in vitro cumulative gas production profiles of feeds using manual and automated methods
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کلمات کلیدی
ADDMWHTNDFMGFMPTGPPAPs - AP هاRing test - تست حلقهGas production - تولید گازSBH - سه گانهMaize silage - سیلاغ ذرتGrass silage - سیلاکس چمنether extract - عصاره اترneutral detergent fibre - فیبر مواد شوینده خنثیorganic matter - ماده آلیdry matter - ماده خشکcrude protein - پروتئین خامGlu - گلوGlucose - گلوکزWheat - گندم
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
A study was conducted to estimate variation among laboratories and between manual and automated techniques of measuring pressure on the resulting gas production profiles (GPP). Eight feeds (molassed sugarbeet feed, grass silage, maize silage, soyabean hulls, maize gluten feed, whole crop wheat silage, wheat, glucose) were milled to pass a 1Â mm screen and sent to three laboratories (ADAS Nutritional Sciences Research Unit, UK; Institute of Grassland and Environmental Research (IGER), UK; Wageningen University, The Netherlands). Each laboratory measured GPP over 144Â h using standardised procedures with manual pressure transducers (MPT) and automated pressure systems (APS). The APS at ADAS used a pressure transducer and bottles in a shaking water bath, while the APS at Wageningen and IGER used a pressure sensor and bottles held in a stationary rack. Apparent dry matter degradability (ADDM) was estimated at the end of the incubation. GPP were fitted to a modified Michaelis-Menten model assuming a single phase of gas production, and GPP were described in terms of the asymptotic volume of gas produced (A), the time to half A (B), the time of maximum gas production rate (tRMÂ gas) and maximum gas production rate (RMÂ gas). There were effects (P<0.001) of substrate on all parameters. However, MPT produced more (P<0.001) gas, but with longer (P<0.001) B and tRMÂ gas (P<0.05) and lower (P<0.001) RMÂ gas compared to APS. There was no difference between apparatus in ADDM estimates. Interactions occurred between substrate and apparatus, substrate and laboratory, and laboratory and apparatus. However, when mean values for MPT were regressed from the individual laboratories, relationships were good (i.e., adjusted R2Â =Â 0.827 or higher). Good relationships were also observed with APS, although they were weaker than for MPT (i.e., adjusted R2Â =Â 0.723 or higher). The relationships between mean MPT and mean APS data were also good (i.e., adjusted R2Â =Â 0.844 or higher). Data suggest that, although laboratory and method of measuring pressure are sources of variation in GPP estimation, it should be possible using appropriate mathematical models to standardise data among laboratories so that data from one laboratory could be extrapolated to others. This would allow development of a database of GPP data from many diverse feeds.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Feed Science and Technology - Volumes 123â124, Part 1, 30 September 2005, Pages 225-241
Journal: Animal Feed Science and Technology - Volumes 123â124, Part 1, 30 September 2005, Pages 225-241
نویسندگان
C. Rymer, B.A. Williams, A.E. Brooks, D.R. Davies, D.I. Givens,