A wife & husband visited a farm, they saw a bull

A wife & husband visited a farm, they saw a bull having s*x with a cow. The wife asked the farm manager:

“How many times does a bull have s*x per day?”
Manager replied: “6 times or more a day”.
Wife: looks at her husband and said…..”you see!!!”

Then the husband asked the manager: “You mean 6 times a day with the same cow?”
Manager said ” No, No, with different cows everyday.”
Husband looks to his wife and says …”you see!!!”

And the fight started!!!

Who caused the fight???