Minutus

I've asked this before, but thought I will ask again...
Can anyone suggest reasons why a cow would give milk without ever
having been bred? Pituitary tumor is one possibility that's been
given. Can anyone think of other possibilities?
appearance appears to my less-than-expert eye to be more bull-like than
any of our others--heavier shoulders and slimmer hips. Temperamentally
I don't see much to say--she pretty much acts like a cow, tho I'd say
better-mannered than some of our others, maybe just because being
milked is a welcome relief for her! (The others are just highly paid
lawnmowers, and don't go in for the milking thing.)

For the bull-like (slightly) appearance the only rubric I've found to
look at is "Generalities, hair, distribution masculine in women",
cortico (but that's adrenal rather than pituitary, isn't it? Plus,
it's not in the "milk in non-pregnant women" rubric.). There've got to
be more relevant rubrics than that, tho...?

Thanks for any thoughts!
Shannon