Question about first year sires

[Danzig]

it's rare because studdish behavior is generally frowned upon and punished with horses in training. it's hard to keep their minds on racing and training if all they want to think about is the fillies.
then, once they're at stud, all they're supposed to think about for several months is fillies...

no doubt it's difficult to switch that behavior on and off. or maybe it's rare because it's rarely tried? most horses at stud aren't 'dual purpose'....i remember when we visited three chimneys that they said it was difficult at first to convince insurers to allow the studs to be ridden. i can imagine the reaction if some of those horses were put back in training!