knabe said:
It’s obvious to pick on shorthorns for bw.
The “cute head” is another deal.
To me, they are like the runts of the litter.
It would be interesting to know from a development perspective why that happens in all animals.
Neoteny, domestication syndrome. I read a lot about this when I was studying the lineback color pattern. It also applies to white heifer disease.
https://www.genetics.org/content/197/3/795
"In a nutshell, we suggest that initial selection for tameness leads to reduction of neural-crest-derived tissues of behavioral relevance, via multiple preexisting genetic variants that affect neural crest cell numbers at the final sites, and that this neural crest hypofunction produces, as an unselected byproduct, the morphological changes in pigmentation, jaws, teeth, ears, etc. exhibited in the DS. "