development of conditioned taste aversion was investigated in five strains of rats. the roman low-avoidance conditioning (rla/lu) and the maudsely reactive cmr/har/lu) strains learned taste aversion faster than the roman high-avoidance conditioning(rha/lu) and maudsely nonreactive (mnr/har/lu) strains respectively. the low-avoldance strain displayed the highest magnitude of taste aversion learning and the non-reactive strain showed the lowest amount of learning. the control strain (rca/lu) was intermediate between the high-avoidance and low-avoidance strains in the magnitude of taste aversion learning.