Italian to English Other Agriculture Animal husbandry

This figures in a list of types of housing for pigs. The list is as follows: Suini
Riproduzione
Scrofe in gestazione in box multiplo senza
corsia di defecazione esterna:
- pavimento pieno, lavaggio ad alta
pressione
- pavimento pieno, lavaggio con *cassone
a ribaltamento*

Anyone got any ideas - I have found mini-dumpers and wash stalls but neither of these really make sense given the context. Could it be a slanted rack floor or something along those lines?

TIA.