NDLI: Methodological factors affecting gas and methane production during in vitro rumen fermentation evaluated by meta-analysis approach

Content Provider	Springer Nature : BioMed Central
Author	Maccarana, Laura Cattani, Mirko Tagliapietra, Franco Schiavon, Stefano Bailoni, Lucia Mantovani, Roberto
Abstract	Effects of some methodological factors on in vitro measures of gas production (GP, mL/g DM), CH4 production (mL/g DM) and proportion (% CH4 on total GP) were investigated by meta-analysis. These factors were considered: pressure in the GP equipment (0 = constant; 1 = increasing), incubation time (0 = 24; 1 = ≥ 48 h), time of rumen fluid collection (0 = before feeding; 1 = after feeding of donor animals), donor species of rumen fluid (0 = sheep; 1 = bovine), presence of N in the buffer solution (0 = presence; 1 = absence), and ratio between amount of buffered rumen fluid and feed sample (BRF/FS; 0 = ≤ 130 mL/g DM; 1 = 130–140 mL/g DM; 2 = ≥ 140 mL/g DM). The NDF content of feed sample incubated (NDF) was considered as a continuous variable. From an initial database of 105 papers, 58 were discarded because one of the above-mentioned factors was not stated. After discarding 17 papers, the final dataset comprised 30 papers (339 observations). A preliminary mixed model analysis was carried out on experimental data considering the study as random factor. Variables adjusted for study effect were analyzed using a backward stepwise analysis including the above-mentioned variables. The analysis showed that the extension of incubation time and reduction of NDF increased GP and CH4 values. Values of GP and CH4 also increased when rumen fluid was collected after feeding compared to before feeding (+26.4 and +9.0 mL/g DM, for GP and CH4), from bovine compared to sheep (+32.8 and +5.2 mL/g DM, for GP and CH4), and when the buffer solution did not contain N (+24.7 and +6.7 mL/g DM for GP and CH4). The increase of BRF/FS ratio enhanced GP and CH4 production (+7.7 and +3.3 mL/g DM per each class of increase, respectively). In vitro techniques for measuring GP and CH4 production are mostly used as screening methods, thus a full standardization of such techniques is not feasible. However, a greater harmonization of analytical procedures (i.e., a reduction in the number of available protocols) would be useful to facilitate comparison between results of different experiments.
Related Links	https://jasbsci.biomedcentral.com/counter/pdf/10.1186/s40104-016-0094-8.pdf
Ending Page	12
Page Count	12
Starting Page	1
File Format	HTM / HTML
ISSN	20491891
DOI	10.1186/s40104-016-0094-8
Journal	Journal of Animal Science and Biotechnology
Issue Number	1
Volume Number	7
Language	English
Publisher	BioMed Central
Publisher Date	2016-06-14
Access Restriction	Open
Subject Keyword	Agriculture Biotechnology Food Science Animal Genetics and Genomics Animal Physiology Experimental factors Gas production In vitro rumen fermentation Meta-analysis Methane production
Content Type	Text
Resource Type	Article
Subject	Biochemistry Food Science Animal Science and Zoology Biotechnology
Journal Impact Factor	6.3/2023
5-Year Journal Impact Factor	6.4/2023

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