From Creatures Wikia
"LTCY" is an abbreviation of "Latency" The command is used to prevent involuntary actions (such as laying eggs, falling asleep and sneezing) from being repeated to often.
Used in the following format:
ltcy action mindelay maxdelay
Actions allowed (at least in C1) are: 0 = flinch 1 = Lay egg 2 = Sneeze 3 = Cough 4 = Shiver 5 = Fall asleep 6 = Faint 7 = Drown
The delay will be between the "mindelay" and "maxdelay" limits. Delay is measured in 0.4 second intervals.