"Artificial insemination carries with it the possibilities of altered genetic information, with serious questions about the survival ability of later generations," he said. The natural instincts of animals can be adversely affected through artificial insemination, he went on. If these animals mate with wild ones, then the possibility that the altered genes will eventually be passed on to the whole population is increased dramatically.
因為人工繁殖常有近親交配情形，他擔心這樣產生的新一代會隱藏不良基因，如覓食能力差、行動緩慢等，野放後它們若與野生種交配，下一代遺傳到不良基因，最後可能連野外種一起滅亡。