T he previous three posts ( here , here , here , here and here ) have explored the borders of “breeding-back”. I give a quick summary. The real differences between aurochs and cattle do not only concern size, coat colour and horns but actually the whole organism: its developmental biology, its endocrinology, its neurology, its behaviour, its morphology, its genome. And all those factors are interconnected and interact in a complicated way. It was probably selection on tameness alone that dramatically changed the organism and the typical traits of a domestic animal (“domestication syndrome”) was more of a by-product. Additionally to that, some new morphologic mutations and artificial selection on certain traits produced the typical domestic phenotype that we see in cattle. The involved number of loci are probably hundreds or more likely thousands. It is very likely that cattle are uniform for these key genes that are responsible for the typical domestic traits that are universal am...
Comments
Post a Comment