During this same time period, breeding practices must have lead to the introduction of harmful mutations, because modern horses show an abundance of these mutations while Scythian horses don't.

在同一时期， 育种实践一定导致了有害突变的引入，因为现代马显示出大量这些突变， 而斯基泰马则没有。

Cloning for conservation, meanwhile, has been on the backburner for a few reasons: Breeding practices are less developed  for species in need of conservation, and there's less commercial interest in maintaining endangered animals.

与此同时，出于以下几个原因，为保护而进行的克隆一直处于次要地位：需要保护的物种的育种实践还不够发达，而且保护濒危动物的商业利益也较少。