What in the world?

In my gone country post I mentioned
a mysterious tank that emits billowing
white smoke when opened. These tanks are
high pressure containers used in the livestock
industry to store vials or straws of semen in
liquid nitrogen ( hence the white smoke) to preserve it
for future use in artificial insemination breeding.
One Sunday after church David Chapman was talking
with another rancher in his ward about his need to
refill his semen tank. By refill he meant refill with
liqued nitrogen but he did'nt specify this.
An older Sister in the ward was eavesdropping on
the conversation and after a while she had to speak up.

Her: Brother Chapman what are you tawkin 'bout?

David: my semen tank.

Her: yore what?

David: my semen tank.

Her: I thaught thats what you said. What's it for?

David: I keep semen in it.

Her: Whar do you keep it?

David: In the barn.

Her: Why on earth do you have a tank full of yore
semen in the barn?

David: It's bull semen we use it to breed cows.

Her: (laughing hysterically, blushing intensely, with a sudden look
of comprehension on her face) I couldn't figure out what
in the world you were up to.