liquid 14 may freely communicate between the two regions but the carcasses 28 are at least partially confined to the region in which each was originally introduced carcasses in each region will be more or less densely gathered in the heat exchanging liquid as the volume of the region changes due to the motion of the baffle assembly 18 alternate cycles of compression and expansion have beneficial effect on the carcasses as will be described more fully in this description baffle assembly 18 includes a drive shaft 20 that may extend at the liquid level along the length of the semi cylindrical tank 12 drive shaft 20 oscillates about the longitudinal axis 22 which may be the longitudinal axis for both the drive shaft 20 and the semi cylindrical tank 12 a power means 23 is used to oscillate the drive shaft an electric motor and gear box may function as the power means in the embodiment illustrated in fig1 a 1c the baffle assembly 18 includes support arms 24 that are mounted at their upper ends to and extend radially downwardly from the drive shaft 20 with the support arms spaced along the drive shaft baffle 26 is formed of parallel spaced apart horizontal slats 30 that are.