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 |