Cross-species studies of animal populations have shown that cubs who are isolated from their mothers within a month of birth often show strong aggression  For example, when looking for food, he is aggressive and fighting for food, while other cubs give in and he is still fighting for food
The antelope isolated from its mother in the early stage showed great aggressiveness in the conflict to establish its dominant position in the population.
 The hypothesis that explains this phenomenon is that the aggressive problem is due to the lack of social training guided by parents at the newborn stage