It's part of the tradition before sacrificing specific animal which is required by their law that they recite tusmiya in order to keep it in good health and meeting specific age.
Part of this ritual when recitation is done, that the Islamic Standards are met especially the meat that will be offered as part of the highlight of the offering which must be considered or qualified as halal.
There are specific incisions and cut that must be followed, and not just do it your way, and these parts are neck, jugular veins, and lastly the carotid arteries.
