The country fair

A guy goes to a country fair with his wife and they start looking at the livestock. The first display is all the bulls. The first bull has a sign that says,
“This bull mated 50 times last year.” The wife turns to her husband and says,
“50 times last year. You could learn from that.”
The next bull has a sign that says,
“This bull mated 65 times last year.” Again the wife says,
“65 times in a year. You could learn from this one as well.” The next bull has a sign that says, “This bull mated 365 times last year.”
“Wow!” says the wife, “365 times last year. That’s every day. You really could learn from this one.”
The man turns to his wife and says, “Why don’t you go and inquire if it was 365 times with the same cow.”