I beg to differ with this. I have had several, several males. Yes, young males with no mature hens will absolutely harass young pullets that aren't laying yet. Same with rude males sharing a flock with other males.Your 14 month old rooster will chase these 14 week pullets relentlessly until they submit causing needless stress in your flock until they're old enough to breed .Any rooster will do the same.Remove him and add him back after they've started laying.If you added more hens he might breed the others and quit chasing them but young pullets are a favorite of any rooster.
But good mannered males, especially males that have older hens should not harass females that are not yet layinng