“…The scientific literature regarding horse welfare in commercial abattoirs is restricted to a few studies in North America (Grandin et al,1999;Friend 2000;Roy et al, 2015a;Roy and Cockram, 2015), South America (Werner and Gallo, 2008;Nivelle et al, 2020), Oceania J o u r n a l P r e -p r o o f (Padalino et al, 2015), and Europe (Marlin et al, 2011;Roy et al, 2015b;Andronie et al, 2017). The transport and slaughter of horses is an important welfare issue that raises great social concern in the USA and Mexico, being a hot topic for non-governmental organizations, citizens and politicians in the region (de Aluja, 1998;Reece et al, 2000;Anderson, 2015;Monterrubio and Pérez, 2020). In 2019 at least 109 thousand horses of Mexico and the USA are transported to slaughter in Mexico (FAOSTAT, 2020).…”