In about the 15th century, however, with the advent of the sawmill, the old log troughs began to be replaced by hives made of boards. These were humorously referred to as truge, or coffins, because of their oblong shape.
Taču ap 15. gadsimtu līdz ar kokzāģētavu attīstību veco bluķa stropu vietā biškopji aizvien biežāk sāka izmantot dēļu stropus, kas savas garenās formas dēļ zobgalīgi bija iesaukti par truge jeb zārkiem.