Bulls Mating

My wife and I went to the Royal Adelaide Show and one of the first exhibits  

we stopped at was the breeding bulls.. We went up to the first pen and there
 was a sign attached that said,

 ' THIS BULL MATED 50 TIMES LAST YEAR '
 My wife playfully nudged me in the ribs .....Smiled and said, 'He mated 50
 times last year, that's almost once a week.'

 We walked to the second pen which had a sign attached that said,
 ''THIS BULL MATED 150 TIMES LAST YEAR'

 My wife gave me a healthy jab and said, 'WOW~~That's more than twice! a
 week ! ..........You could learn a lot from him.'

 We walked to the third pen and it had a sign attached that said,
 in capital letters,
 'THIS BULL MATED 365 TIMES LAST YEAR'

 My wife was so excited that her elbow nearly broke my ribs, and said,
 'That's once a day ..You could REALLY learn something from this one.'

 I looked at her and said,
 'Go over and ask him if it was with the same cow.'