A method for monitoring live poultry intended for slaughter includes checking managing parameters and process parameters of poultry flocks from breeding farms, and monitoring transportation of the flocks to a slaughterhouse and handling thereof at the slaughterhouse. Gas stunning parameters of the poultry are checked prior to throat-cutting thereof. Video shooting of the poultry's reactions during the stunning step is done to visually verify a degree of well-being thereof. Computer records are made available wherein a single video file corresponds to each poultry flock or group of flocks in which images of the visible reactions of the poultry are combined and synchronized with said managing and process parameters.