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Table 1 List of references excluded from the meta-analysis. Additional file 1

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

References

Reason for exclusion

Salem, 2012

Only gas production was measured

Abarghuei et al., 2014

Rodrigues et al., 2014

Salem et al., 2014

Elghandour et al., 2015

Lavrencic et al., 2015

Rojas Hernandez et al., 2015

Rossi et al., 2001

Only methane (CH4) production data were reported and not the total gas production (GP) or CH4 proportion on total GP (% CH4 on total GP)

Wallace et al., 2006

Wood et al., 2009

Becker and van Wikselaar, 2011

Cao et al., 2012

Castro-Montoya et al., 2012

Poulsen et al., 2012

O’Brien et al., 2013

Rira et al., 2015

Aemiro et al., 2016

Lovett et al., 2004

At least one investigating factor was missing

Hu et al., 2005

Tavendale et al., 2005

Lovett et al., 2006

Patra et al., 2006

Hassim et al., 2010

Kamalak et al., 2011

Sun et al., 2011

Baraka and Abdl-Rahman, 2012

Blanco et al., 2012

Banik et al., 2013

Kim et al., 2013

Lin et al., 2013

Naumann et al., 2013

Durmic et al., 2014

Nanon et al., 2014

Castagnino et al., 2015

Cobellis et al., 2015

Copani et al., 2015

Jayanegara et al., 2015

Liu et al., 2015

Pirondini et al., 2015

Qiao et al., 2015

Rajkumar et al., 2015

Saminathan et al., 2015

Theart et al., 2015

Serment et al., 2016

Anele et al., 2011

Methane production data were indirectly predicted

Zhang et al., 2011

Meale et al., 2012

Methane production data were indirectly predicted

Pang et al., 2014

Polyorach et al., 2014

Gemeda and Hassen, 2015

Ungerfeld et al., 2007

Control data of feed sample treatment were missing

Hart et al., 2008

Wang et al., 1998

GP and methane data were obtained using continuous or semi-continuous apparatus

Amelchanka et al., 2010

Soliva et al., 2011

Williams et al., 2011

Li et al., 2013

Wischer et al., 2013