Carollo A, Giammanco S, Paderni M A
Boll Soc Ital Biol Sper. 1979 May 15;55(9):866-70.
The 20% of male 5-6 month-old Wistar rats SM prove to be natural killers. A four-month long insulation of "surely non-killer" rats has not allowed to notice a mouse-killing behaviour in any animal. The total bilateral removal of olfactory bulbs in "non-killer rats" causes a "mouse-killing behaviour" in all the animal 24 hours after the operation, but with a latency of response that has proved different in the various rats. Precisely, while 24 hours and 15 days after the bulb operation the rats can be distinguished into "rapid killers" and "slow killers", after 30 days all the animals become "rapid killers" with a remarkably shortened period of mouse-killing latency (1 - 60 seconds).
20%的5至6个月大的雄性Wistar大鼠SM被证明是天然杀手。对“肯定不是杀手”的大鼠进行为期四个月的隔离后，未在任何动物身上发现捕杀小鼠的行为。对“非杀手大鼠”进行双侧嗅球完全切除后，所有动物在术后24小时都会出现“捕杀小鼠行为”，但反应潜伏期在不同大鼠中有所不同。确切地说，在嗅球手术后24小时和15天时，大鼠可分为“快速杀手”和“慢速杀手”，而在30天后，所有动物都变成了“快速杀手”，捕杀小鼠的潜伏期显著缩短（1至60秒）。
